12au7 tube comparison

12au7 tube comparison. When I was breaking these ART-S in, I had a week or two chest head cold, so my hearing wasn’t the best. I have never heard them. 12AT7 - 60 12AY7 - 45 12AV7 - 42 12AU7 - 19. Location: The Philippines. Highly recommend. I'll swap th rca 5814 0:00ge 5814 0:22philips ecg 5814 0:44telefunken 12au7 1:07siemens 12au7 1:07jj 12au7 gold 1:51jj ecc802 gold 2:14eh 12au7 2:36toshiba hi-s 5963 2:59 This gives us a general category of amplification that the tube was designed for as compared to other preamp tube types like the “medium-mu” 12AU7. I got the 5963 tube first, so I put it in the preamp 12au7 position and wow, much different in my system than what I was expecting -- due to the general consensus I read The ecc82 valve also known as a 12au7 is a low gain preamp valve used in guitar amps and hifi ampliers. 12AT7 tubes can control things like how rich your reverb or tremolo is, or define your amp’s headroom and distortion characteristics through the phase inverter (PI). They're very warm/dark, they had a pronounced hum that I could not get to go away even after adding Not the tube I'd use with my Grado but work well with my LCD-2. There are many more examples. Otherwise, there is no difference. Here's another one. If you like very detailed, very airy sound with a fantastic sound stage – this tube in 12au7 family is it. Rick58, Aug 10, 2020 #4. To the page content. The plate dissipation for these two tubes is noticeably different. comNote at the end I mention the E80CC, which is an entir 6L6 comparison chart. My Account; My Wish List () Sign In; Compare ; Create an Account; Skip to Content. Almost as good as my reference Amperex 6922s (coming up soon). Thanks Patrick at Sweetwater, unique "box-plate" design, absolute high-end 12AU7 tube, The listening was done on my Elekit TU-8200DX which is a small hifi amplifier in class A and single stage. Using 12AU7 in the input wasn't as clean sounding as the 6FQ7/6CG7. It co genuine benchmark for comparing the calibration of two or more testers. The preamp tube is at the heart of audio amplification within your guitar amplifier. Both the ECC83 and the 12AX7 are dual triode tubes commonly used in the preamp section, providing the necessary gain that guitarists rely on for both clean and Reviews of 7 - 12AU7 vacuum tubes and variants. I have been comparing the stock JAN PHILIPS ECC82 At that point, Apos was offering two different "premium" tube options, 12AU7 tubes (typically for preamps) and 6SN7 tubes (typically for amplifiers), with both varieties Of these, we have found that some of the best sounding brands are Gold Lion gold pins, the Mullard re-issues, and the Psvane “ART” series tubes. In the course of calibrating many tube testers, I collected data on how various models and brands measured the quality of a particular tube of known quality. Downloads: Electro-Harmonix 12AU7A / ECC82EH Datasheet (PDF) Download Adobe Acrobat PDF reader. Look at the 12AU7 line: at the far right we see Plate Current = 10. One thought on “ Telefunken Sound stage is fantastic – three dimensional, but yet well defined. Does anyone have an measurements on what gain increase / decrease you’d get using the 6V tubes (obviously with voltage and current jumpers set appropriately) versus the This item: JJ ElectronICs 12AU7 / ECC82 Preamp Vacuum Tube . Given that info the first four tubes I tested read : Video in which i compare modern and vintage tubesNOTE; Use hi quality speakers or headphones to listen to the samples. I paid $22 each for them. Hi, comparison of the 12A?7 family tube, anyone able to tell me the sound difference when use in pre-amp? For example this board on ebay 1pc Gold Plated ECC83 12AX7 ECC82 12AU7 Tube Preamplifier DIY PCB 6 3V OR 12 6V | eBay use 12AX7 follows by a 12AU7. Midrange is good. Not at all. That was using the OEM 12AU7 tubes. £67 Yes, I have also experienced that at certain positions it doesn't make much or any difference to substitute a tube which in another circuit makes a big difference. Electro Harmonix 12AU7EH. 12AU7 / ECC82: The 12AU7 is another lower-gain tube (20% of the 12AX7’s gain) that offers a more linear and transparent sound. For an Does it worth the 5x price, it’s for you to decide. Fig 2. ” Read “ generally speaking all the Telefunken 12A family tubes I’ve heard (‘X7s, ‘T7s, ‘U7s) are a bit bright, thin and airy sounding. Once I get them burned in I'll do another update with comparison also. NZ $59. A tube preamp GE standard tubes (about $30/pr on Brent’s website when on sale). 12AU7 Tube Types. Bookmark the permalink. 1. 22. Page 1 of 2 1 2 Next > Clay Forum Resident Thread Starter. I realized that 6SN7 or 12AU7 Tube preamp for Gainclone. Sound stage is fantastic – three dimensional, but yet well defined. All times are UTC [ DST] 12AU7 LM386 Regen single tube radio. The best pure 6SN7 GTB's were made by Hitachi in Japan IMO and have many different labels, most common are ITT and HitRay. Toggle Nav. Compared to the vintage Amperex tubes it doesn't even compete. Yes, I have done the direct comparison and prefer the 6SN7, even better, a pair of 6J5-GT's each of which equals exactly one half of a 6SN7 and there are adapters available on Ebay. The gainclones are pretty I use PASVANE 12AX7 and 12AU7’s to smooth the tone. I've always thought that they were interchangeable without any problem. TAD Solid State Rectifier. They both have thick mica wafers which give the tube extra rigidity In this review, we will focus on the difference between a 12AT7 and a 12AX tube. Read our reviews and ratings. In many cases, these tubes are interchangeable and can easily be swapped. Share this post: This entry was posted in 12au7/ECC82 by tubemaze. Case in point: In my Audio Note Kit One amp, replacing the two E182CC tubes, which work as driver tubes, for 1950's Tungsol 5687 tubes made a huge difference. 12AU7 will need to be configured for 6. I'll swap the V1 and V2 preamp 13 Comments on EL34-family Tube Comparison! Andrew // 2016/01/28 at 7:10 pm // Reply. 1 Warm and Linear Tonality The first thing I noticed with the Ray I’ve found that if the circuit design using a pair of preamp tubes for input gain (12AU7, 12AX7, etc. Testers that are out of calibration cause troubles for tube users, tube sellers, and for technicians repairing tube equipment. And finally, we should just mention that they are very reasonably priced for their level of quality and durability. But ordinarily I would say that vintage Tung-Sols are a good bet for any tube type. JJ Electronics 12AU7/ECC 82 Preamp Vacuum TubeThe JJ Electronics 12AU7 preamp vacuum tube is the North American counterpart of the versatile European ECC 82 pr 12AX7 vs 12AT7 vs 12AU7: Differences Explained. There are a lot of NOS tubes out there you could chase but I'm going to stick with new production tubes for this comparison. Our article explores performance differences and substitutes. Location: Saratoga, CA. The 12AY7 valve (also known as the 6072) is a 9-pin tube. 3 V The Apos Ray 12AU7 tube sits at the higher end of the market at 180$ for the matched pair. What types of tubes can be considered as compatible with Buy the JJ Electronic Pre-Amp Tube 12AU7 / ECC82 direct from a New Zealand authorized dealer at the Tone Lounge NZ online store Compare 0. N. £22. Electro Harmonix 12BH7EH Tube. Stick with black plates only. A triode is the most basic tube structure that allows for Well, I think I just found the ideal 12AU7 preamp tube for my C-J PV12, but before I disclose it, I'm curious, those of you that use this tube, what's your favorite 12AU7 ((ECC82)? I'm sure some of you guys have done some tube rolling for this tube specification and have some useful experience and input for all of us to benefit from. As big as an EL84 power tube it imparts a body and smoothness to the sonic presentation that I just love in My current favorite 12AU7's are 12BH7's Good match electronically, albeit with a bit more draw. I suppose I might be able to sub a 12au7 for 12av7 or 12ay7, I'll have to chk on compatibility When you compare the quality of 6j1 tube rolling with the cheap China tubes, it’s something you can’t even compare. Joined 2014. References: Data-sheet & 1040. Comparisons to Other Tubes I've used a variety of different tube sets in this amp thus far, and here are my thoughts on how the PSVANE 12AU7 compare. An amplification factor of 17 is quoted. 6189/5814. The Brimar 12BH7A is a really nice tube. And they were classified by these parameters even when they were being produced. Not wanting to miss a great opportunity for an experiment, I looked for and acquired one of the new “Reissue” New Sensor Mullard 12AX7′s (thanks again Joe!). A triode is the most basic tube structure that allows for signal amplification As a driver tube the 6CG7 is far superior to a 12AU7, the socket wiring conversion is quite simple, and the sonic difference is well worth it. I sell tubes on eb In this video I show the difference NEW Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization. Lance 10th May 2016. Two vacuum tubes were tested for each type (left and right channel). Thread starter MrJackson; Start date 2015-12-06 7:02 pm; Status Not open for further replies. The newer Genalex tubes coming out of the American owned Electro-Harmonix/New Sensor ExpoPul facility in Saratov, Russia manufacturers 2/3d's of the world's supply of tubes 12AU7 Tubes in Stock . Quantity in Stock : 8 pcs Price : Grade A @ US$ 19. There are lots of sonic flavors to explore with different 12AT7 and 12AU7 preamp tubes are lower gain tubes. Free UK I went through 3 JJ 6922 before I got one that was quiet enough for a preamp. Wb . 29 € Comparer 145. In fact, the internals of the Reissue bore little resemblance to the Our Newest Current Production Tube: The Psvane 12AU7-S Art Series Out of curiosity, I bought a pair of the 12ax7 and 12au7 for my preamp and phonostage and my early impressions are that it's well balanced and has more bass compared to the older TII model. More information is coming through with the 12BH7 than with the 12AU7. category of amplification that the tube was designed for as compared to other preamp tube types like the “medium-mu” 12AU7. If you like very detailed, very airy sound with a fantastic sound stage – this tube in 12au7 family is I have a Rouge Audio Cronos Magnum and I rolled the original tube for exactly that, a NOS Mullard cv 4003 (12au7) and it warmed up the entire soundstage. The old nos tubes cost over $100. New production JJ Tubes (came with the amplifier) [JJ] 2. If you're willing to operate slightly non-optimized bias TAD RT005 Tube 12AU7. 3 Line Stage preamplifier which are simply outstanding sounding I decided to try the New Horizon 12au7-AT in the MP-3 Mk3. My impression of the Bugle Boy is it sits a little bit more on the detailed side Vacuum tube 12AU7 Genalex/ECC82/B749 is a miniature twin triode with equipotential cathodes, designed to amplify low frequency voltage in radio engineering devices. I have around 20-25 hours on them. Highs are not as airy as other tubes and bass a but less full. Many think the military versions sound better but RCA frickin’ invented the 12AU7, so if you are looking for a quality classic sounding tube, it is hard to go wrong with one of the numerous iterations of the 12AU7 RCA produced over the years. These were made to tight specs Changing tube types (12AU7 for 12AX7, for example) will likely make a radical change in the way a piece of equipment sounds, and maybe for the better but more likely not. It might Audio Review of 12AU7 and 12AX7 tubes by Joe S. Vacuum tube 12AU7 Genalex/ECC82/B749 is a miniature twin triode with equipotential cathodes, designed to amplify low frequency voltage in radio engineering devices. The Gold Lions are great tubes, The Treasures are exceptional tubes in all respects. chipcalzada Forum Resident. As good as the original article My phono stage uses one 12AU7 type tube, and it has a very noticeable effect on the sound. The graph shows that small differences were measured between two different tubes of the same type Two popular vacuum tubes often used in audio applications are the ECC83 and the 12AX7. The highs are most certainly there. One thought on “ Telefunken Others 12au7 tubes which will be used for comparison in this sound review. Joe's Tube Lore [ Audio Asylum] [ Speakers] Amperex 6DJ8, Orange globe logo, Holland (shield, steel pins,) Much better than the above tube No comparison in fact. Member. Your basket is Received in a timely manner, well packaged and has made a huge difference to my sound. The tube intensifies and clarifies the source audio, making the color of the sound much better. Compare options. + JJ Electronics Amplifier Tube (T-12AX7-S-JJ) $19. 2015-12-06 7:02 pm #1 2015-12-06 7:02 pm #1 Hi guys, I am planning a DIY build for tube preamp that should go before a pair of gainclone monoblocs. Most 12Ax7s I used produced too much distortion. Sovtek 6550 WE. GE standard tubes (about $30/pr on Brent’s website when on sale). The Tung-Sol name and trademark have been acquired by the New Sensor Tried in in Bottlehead Crack. Which 12au7/5814 tube won the right to be called the best and the worst? Updated August 7th, 2020. Audiophiles may have their own favorite dual triodes, ranging from exotic European types like the ECC40 to the rugged industrial types The electronics industry moves fast: the technology of the 6AV6, and hence the 12AX7, was old news, and so were miniature twin triodes. unique "box-plate" design, absolute high-end 12AU7 tube, outstanding audio quality even in direct comparison with NOS Telefunken ECC82 and Mullard CV4003 or M8136. £33 Compare 17. 26 € Comparer 115. Replacing the V1 tube is a cheap and easy way to modify the amp. Parameters, conditions and units Nominal Heater current, mA at: filament voltage 6. 3. Additional Information and Downloads. But my second favourite tube is the Raytheon you both mention. There are no organ shops now that have large tube stocks. The TELEFUNKEN Elektroakustik ECC82-TK is a newly manufactured and cryogenically treated rendition of the classic ECC82, commonly known by the American designation 12AU7. Get it as soon as Wednesday, Sep 11. WOW it smooths up upper freq. In the analog stage of my AN DAC, I OK. I do have in my home the JJ 12AU7, Radiotechnique 6199, and a bunch of others not as worthy, but for logistical purposes, I only seriously compared the above three. Tube prices: 4 Tube prices (visible for members only) Information source: Essential Characteristics, GE 1973 12AU7A: RCA Tube Manual Heinz Höger 12AU7A: RTT 1974 (Franzis) 13. Check out how lower gain 12AT7 preamp tubes affect the overdrive channel of an amp. Besides the above mentioned Raytheon 5814 tube, I also ordered a NOS RCA U. A separate filament transformer was used on the switching box to simultaneously heat all six comparison tube filaments without overheating the amplifier’s power transformer. I'm not going back to the 12AU7. 35 € Comparer 92 Later the 13D8 (which I could find no pictures of) seemed to be the last of this series of industrial 12au7 types from Brimar. £24. I really think most people that read audio boards about tubes would be shocked at how little the differences in sound is between two in spec 12ax7s from different labels in an amplifier that’s running them within their parameters. It is based around 12AU7 / ECC82 audiophile vacuum tube that provides warm, rich and smooth sound expected from audiophile amplifiers. We When you’re looking to shape your guitar’s tone, the choice between a 12AU7 and 12AX7 tube can be pivotal. If you're willing to operate slightly non-optimized bias 12AX7 vacuum tube comparison results are depicted in the plot below where, for each test, the THD at 1 kHz is reported at various output power levels, raging from 1W to 10W. 29 € Comparer 205. I played for about 2 hours flipping between Amperex 12au7 BB Long Foil and that tube and at first it was not very obvious that 7316 was better, but the more I listened to that tube the less I wanted to listen to 12au7 (remember I was in love with 12au7 – love is such a flimsy thing Smiley So two hours later with my ears bleeding – wait – I meant my ears smiling with https://upscaleaudio. Very happy with the service. I am no expert but I called rogue before I rolled the tube and they told me what to expect and what not to. More related options such as vacuum tube, electron tube, audio tube could be your choices too. Genalex Gold Lion 12AU7/ECC82 Gold Pin Preamp Tube Features: Premium 12AU7 with gold pins Top-quality preamp tubes from a legendary manufacturer Pretty bummed. Timecodes 0:00 Intro Immerse yourself in the authentic, warm sound of the Ray Vacuum Tubes, setting a new standard for audio enthusiasts. Improve your audio equipment with suitable 12AX7 compatible tubes. The thin glass tube envelope is 19 mm in diameter and the length excluding the B9A base pins, is 48 mm. It’s responsible for the initial increase in the signal’s strength before it hits the power amp stage. 1. A 12ax7 will only dissipate 1 watt max vs 2. Setup: The setup used for I also have some 1950's RCA, GE and Raytheon 5814A tubes to try and will be interested in seeing how these compare to the CBS tubes. 5 ) mm-2 Dimensions 12AU7 Genalex/ ECC82/B749 . First, it was less My phono stage uses one 12AU7 type tube, and it has a very noticeable effect on the sound. Is there any difference when use any combination of 12A?7 tubes? eg: 12AX7+12AX7 or Sound completely depends on the circuit, how the tube is pushed and how complex it is and of course the condition of the tube. This The 12AU7 is probably the first Noval (B9A) tube ever, registered on October 18, 1946, in the Electron Tube Registration List, followed by the 2C51, registered on November 25, 1946. recht kratzbürstig klang, klingt er nun sehr viel ausgewogener, wärmer und detaillierter. That tube and the GL 6922 are the only tubes that last AND sound good in my c-j. Check out how lower gain 12AU7 preamp tubes affect the overdrive channel of an amp. The 12AU7 name is its American or “common” name while the ECC82 title is its European name and Mullard Phillips tube designation. I use the Genalex 12AU7 as a rectifier tube in my Dynaco ST-70 clone and it's the best I've heard in that spot so far. The most noticeable characteristic of this tube 1. Featuring top-of-the-line gold pins for enhanced signal transmission and durability, and crafted with This is a McIntosh MA-230, stereo integrated hybrid amp, ss pre and tube output. Last edited: Aug 10, 2020. First of all congrats on your new preamp! What are the stock 12au7 tubes that come with it? If the dealer recommends Sylvania (which is my favorite NOS 12au7) then its best to Tube 12AU7, The best sound from ECC82 releases, Corresponds to the ECC 82 preamp tube, Powerful reinforcement, Very quiet and excellent balance, Particularly suitable for hi-fi, Ideal for Ampeg amplifiers as a driver I've ordered a matched pair of Psvane 12au7-S and a pair of Psvane Cossor 12au7, black carbon crystal tubes. Tim Smith // 2016/01/29 at 5:53 pm // Reply. €48. These are the “higher grade” military version and cost me 5x the price of the regular 337’s. This tube is hand-selected for top-tier performance, featuring gold pins for excellent conductivity and low noise. The black plate for example, provides a rich, warm, loose, and deep sound, yet the grey plate, clear top TAD RT005 Tube 12AU7. But--this is my first experience with a 12BH7, so I'm short on experience on this tube overall, but it beats the Mullard CV4003 hands down--in subtle ways. First step is to clarify which tube you should be The 7025 is a tube that was developed in the 1960s as an upgraded version of the 12AX7. Killer tube. I need some help here. Quick Summary The existing PrimaLuna 12AU7 tubes have an estimated lifespan of somewhere in the neighborhood of 10,000 hours, so there was no inherent rush to replace any of those—except the pair of input tubes. 3 V This item: JJ ElectronICs 12AU7 / ECC82 Preamp Vacuum Tube . What is cool is each RCA 12AU7 comes with its unique sonic characteristics. The 5751 is not a 12AX7 tube. As we pointed out previously, all 12AX7 tubes I just received 2) 12AU7 re-issued and they sound good. Since I got my Tavish Design Adagio stage in 2017 I've experimented with most of the types listed above, most with very good results compared to the stock JJ Tesla tubes. Based on user ratings in the last 8 years and over 5000 ratings submitted, here is the My very favorite 12AU7 type tube is the Amperex (Holland) 6085. If the 12AU7 has a 100kΩ plate load resistor, how much supply voltage will the amp need? At least [(100kΩ The amp came with JJ tubes, but I immediately swapped the four JJ 12AU7 tubes for NOS Mullard 12AU7/ecc82, Gf2 version (Blackburn plant). Good tube, no comparison to a Reflektor 6n23h-eb though. They are featured here as a comparison between new tubes and NOS 12AX7 TUBE REVIEWS CHART 12AX7 comparison at a glance. This might give pause to some potential users, but as we'll explore, the quality and performance may justify the investment for serious audiophiles. 12AT7 * * * * The 12AT7 is a clearer sounding tube than a 12AX7 but with a little less gain. The existence of many variants and many manufacturers of the 6SN7GT over the years gives lots of types to play with—each with its own sonic fingerprint. TAD GZ34 Redbase Tube. I will compare both E80CC's to Amperex 7316PQ, which is IMO the best all-around 12AU7. . PA, U. Electro Harmonix 6V6GT Matched Pair. 99 Shipping: Calculated at Checkout I must confess Matt Lachesky’s detailed autopsy of New Sensor’s “Reissue” Mullard 12AX7 and a genuine Mullard Blackburn ECC83 stirred my interest [see ‘Mullard ECC83 (12AX7) Reissue vs Original – A Physical Comparison’]. By I just received 2) 12AU7 re-issued and they sound good. Compare Remember Part Number: FM-12AU7. So here is a brief description of the sound attributes each I am auditioning this tube in the center position of a VTA ST-70 with GL KT-66 output tubes. There is no difference between the components of the two tubes and they are interchangeable. Page 1 of 2 [ So far they are a little bright on top with a lack of soundstage depth compared to the RCA clear tops that came with the amp. It has a mu or gain factor of 18 so is very close to the 12AU7. 12AU7 is much closer to 6922 but not the same. My speakers and For 12V heaters, you can compare 12AU7, 12FQ7, or 12BH7 and get the same overall system transfer characteristics, although you'll need to install carefully calculated cathode resistors between each listening session for each tube's optimized performance (DC operating point, output voltage swing, etc). Then I contacted Upscale Audio in California and they answered a whole bunch of I do have in my home the JJ 12AU7, Radiotechnique 6199, and a bunch of others not as worthy, but for logistical purposes, I only seriously compared the above three. 19 $ 19. In China and Russia, it is known as 6j1, while in Western countries, it goes by 5654, EF95, or 6AK5. The low end seemed a little more full compared with the 12BH7. 90 Compare 175. Huge difference in tone, power, and sweeter cleans. Link to Quality Vintage Tubes: https://valvesnmore. 75 watts max for the 12au7. The nuances of female voice communicate by that tube are just hard to compare to anything else, until I listened to Long Plates Mullard 12au7 Long Plates – expensive tube – NOS is going for Sound stage is fantastic – three dimensional, but yet well defined. Issue here is high frequency. 5mA. 12AT7 (also known in Europe by the Mullard–Philips tube designation of ECC81) is a miniature nine-pin medium-gain (60) dual-triode vacuum tube popular in guitar amplifiers. It was originally designed as a low noise tube and was actually developed Skip to content. Great tube – very transparent with good balance of speed and warmth. They produce impeccable sound on any pre-amp. 12AX7 Comparison of Current Made Tubes - Amplified Parts Many people have discovered that the Hot Rod Deluxe is too unwieldy with its volume. Psvane 12AU7 compare 510×503 50. 5 ) mm-2 Dimensions 12AU7 Genalex/ ECC82/B749. Have you ever wonder what the difference is between each of the 6l6 tubes, have a quick look at this chart to help you see what the differences are as it just might help you choose. After about three to five hours of listening it began to sound more relaxed. Tung-Sol NN099-G Tube 12AX7/ECC803S. I learned about the useable variants of the 12AU7 a little later, including the 5814A and 5963 types. "I wont dispute what the amps designer claims for his amps, but these tubes are not substitutes for one another. It is what is called a ‘double triode’. Sets up the same on my 6000A except for maybe a few slash marks on the shunt and bias settings. Characteristic Value Significance; That 6189 is a really nice tube, esp for the money. ” Read. Electro Harmonix 12AT7 EH. If you As a reverb driver tube (in a Blackface/Silverface-type reverb driver circuit), a 12AU7 is a fantastic choice to sub for a 12AT7 if you want less overwhelmingly deep reverb. Surprisingly, they’re not nearly enjoyable. 3 preamplifier The New Horizon Line from PSVANE has equaled any of my NOS 12au7 vacuum tubes from 1960-1970 Preamp Tube Type: JJ 12AU7 / ECC82, Double triode with medium gain, Very smooth and defined sound. From the Dowd-RCA archives, we learn that the 12AU7 was preceded by the experimental type A4498 from November 1945. The 12AT7 is found in many high fidelity applications, as each triode section in normal use operates as a If you compared these to an Electro Harmonix 12au7 tube, the JJs have a slight V characteristic that is warm without nearly as much mid-forward response. Served with love! With our cookies we would like to offer you the best shopping experience possible with everything that goes with it. This gives us a general category of amplification that the tube was designed for as compared to other preamp tube types like the “medium-mu” 12AU7. I like both Mullard and Tungsram tubes and they both work amazing in my Bogne Customers like the sound quality of the tube. Typically they're not as bright as a 12AU7, which is a big plus for me. I’m sure the tonal comparisons have been done a million times over, but I doubt many people have dissected both tubes to compare, Tube Role in Amplification. Have any of you tried any of the US-made TMBP 5814s? The 12AU7 variety does not sound that hot in my SP MPX3, but of those that I have tried the GE TMBP 5814s sound the best. GreatTone Super Member. This is a replica Russian tube based off the vintage tubes and it just kinda blows. Apr 11, 2011 #2 In my Dynaco SCA-35's phono section, the original Telefunkens are still sounding great. They also say the tone is still rich, and the JJ tubes are some of the smoothest sounding tubes they've used. The 12AU7 tube type is equivalent to the European ECC82 tube and can be used in any 12AU7 or ECC82 circuit. 3 V Grid reverse current, , ( at: filament voltage 6. I remember reading somewhere that substituting a 12au7 could possibly damage the tube due to some kind of circuit design that would really push the 12au7. Great tubes, and considering that you're very happy with your current setup, you can be patient and keep an eye out for good deals. 5 6. 5 m m m a x Ø(22. It’s a difficult job to compare tubes when they are all of such high quality. I compared it to RCA clear top and Amperex and this tube is a clear winner. It looks like construction is simplified (less parts) for the new model. There is a difference for sure. The 12AU7 (ECC82) is a Twin Triode vacuum tube, it is very popular in the audio world because it is rather rugged and can be operated at lower voltages. This tube comes very close to Telefunken smooth plates. What this means is the 12AU7 must be passing 10. Registration to Lansdale Tube Co. Where my chart says 2200 for the 12AU7 it says 2775 for the 5814A. 16,70 € Comparer 22. At the time of writing this review, the tubes are only available within the US, with no offers in europe. £30 A lot of people will substitute a 6CG7 for a 12AU7 ***if the filament wiring allows. Sold by ADVENTURER'S BAG and ships from Amazon A 12AT7 preamp tube is a lower gain tube. In Stock. There are a wide variety of brands and permutations of 12AX7 tubes. Other substitutes in these families are (some are much more resilient and built for rugged use, called "ruggedized" in the tube field): Ich geh' mal zum Doc: Hier gibt's alle Produkte der Marke TAD: die exklusiven TAD Redbase Röhren, premium-selektierte Grayplate Röhren, Equipment wie unsere Class A Converter, Bias Master oder Silencer, sowie Hallspiralen, Kondensatoren oder Others 12au7 tubes which will be used for comparison in this sound review. I’ve been listening to the standard version of these, so it’s been easy to do a comparison. But for a direct sub, I don't think there's much difference between the various versions of of the 12AU7 itself. I just checked my Mac C20 tubes with my new This tube has a mu factor of 60, as compared to the higher gain 12AX7 with a factor of 100, and the 12AU7, with a mu of only 20. It's okay but not a tube that I'll use again. each channel uses 1/2 of a 12ax7 and a 12au7 to drive a pair of 7591 power tubes. It's designed to deliver a refined and reliable sound, making it a premium choice for audiophiles. Grey rows represent discontinued and unavailable tubes. 8 KB As I thought about the best way to do this kind of tube review – with so many tubes – I had run into a 6DJ8/6922 tube shootout that was done some time ago. GE placed a vibrant, two-page ad for their new Tube preamps with 12ax7 tubes can be found in various audio equipment, ranging from standalone preamplifiers to guitar and bass amplifier heads. 3v heaters Buy the JJ Electronic Pre-Amp Tube 12AU7 / ECC82 direct from a New Zealand authorized dealer at the Tone Lounge NZ online store Compare Compare 0. New production Full Music $70 (per pair) [FM] 3. £16. Thanks. It belongs to a large family of dual triode vacuum tubes which share the same pinout (EIA 9A), including in particular the very commonly used low-mu 12AU7 and high-mu 12AX7. The 12AU7, a legendary vacuum tube, boasts an array of desirable characteristics that have cemented its place as a cornerstone of audio electronics. Getting back to the JJ Ecc802s. Whether it’s the warmth and smoothness of a tube-based preamp or the precision and clarity of a solid-state circuit, there The 12AT7 might not be the first tube you think of when determining which tubes to upgrade in your amp, but underestimating their importance is a huge mistake. All the major brands are covered A 12AT7 preamp tube is a lower gain tube. This entry was posted in 12au7/ECC82, but it was definitely more transparent than 5814. Ended up using it for a while. I tried the 12BH7 and the 12AU7 in the outputs and ended up with leaving the 12AU7 in. S. 80 Compare 115. ) that finding a pair that has decently matching gains on the first triode (if that is how the tube is implemented) is a good way to go. £21. His dissection revealed substantial anatomical differences between the two tubes. My conclusion is that the E80CC family does sound (to me) better than 12AU7 family. Your basket is empty. Last edited: Apr 11, 2011. Each design brings its own unique characteristics and sonic qualities, providing ample options for achieving the desired sound. As you can see, these were the only tubes I had on hand and 4 x 12AX7 and 1 x 12AU7 tubes, I have to say that my favourite tube in the V1 is a NOS Telefunken 12AU7 (even though technically in the V1 it should have a 12AX7A (7025) or similar). I slightly prefer “Changed my stock tubes with Telefunken 12AU7. They all Lothar's Guitar School - Gear Tubes 12AU7 vs. These latter two types are "audio" tubes with sonic performance like the 6SN7 in the 9-pin mini format; the 12AU7 is an RF tube. Does anyone have an measurements on what gain increase / decrease you’d get using the 6V tubes (obviously with voltage and current jumpers set appropriately) versus the Next, check your PI tube (in push-pull type amplifiers) and try a 12AU7 or a 12AT7 and see if you prefer the results to a 12AX7 tube. TAD 12AXTA/ECC81 Premium Select. Get it as soon as Tuesday, Sep 10. Great review! I’ve purchased lots of tubes from the Tubestore and am a fan of EL34s (and EL84s). The Buying or selling minerals has never been easier! If you are about to import 12au7 Tube, you can compare the 12au7 Tube and manufacturers with reasonable price listed above. Whether you’re a seasoned tone chaser or just This is simple to build audiophile class-A tube headphone amplifier. 24,90 € Comparer 35. This gives us a general category of amplification that the tube was designed for as compared to other preamp tube types like the "medium-mu" 12AU7. The Apos RAY 12AU7 tubes finally arrived, and shortly thereafter, the shipment of replacement tubes from Upscale Audio. 12AU7 * * * * The 12AU7 sounds like a 12AX7 but produces a lot less gain in the preamp circuit. For a start, the most distinguishing aspect that differentiates a 12AT7 from a 12AX7 or a 12AX7 from a 12AU7 is the gain or amplification factor. The first lot of 300 units was scheduled for August 1, 1946. I needed to establish a baseline for the In conclusion, comparing different 12AU7 preamp designs is an enlightening exercise for any audiophile or DIY enthusiast. 12ax7 is high gain low current 1/15 of 6922. MrJackson. Sometimes the values vary by a factor of nearly 10. AMERICAN HIGH END SPEAKERS, AUDIO TUBES, AMPLIFIERS, BEST VACUUM TUBES 12AU7-WC, CryoTone Tubes are the The 7025 is a tube that was developed in the 1960s as an upgraded version of the 12AX7. The use of this valve will give more headroom and clarity and lower the gain on a over distorted valve amp. Arguably the Best sounding American 12AU7 Starting with the Ta-01b, a single 12au7 is used as a preamp for a solid state current amplifier, the Ta-03s is an all tube amplifier with a single 12au7 preamp feeding a pair of 6s19P power tubes (The Ta-03s will be covered in installment Tube 12AU7, The best sound from ECC82 releases, Corresponds to the ECC 82 preamp tube, Powerful reinforcement, Compare options. That, coupled with their legendary tonal complexities, balance, low noise floor, and longevity make the Mullard 12AX7 the best 12AX7 TAD RT005 Tube 12AU7. This tube has a specially designed Its ability to deliver extended and solid bass, sweet mids, and silky highs makes it a standout choice for those seeking to elevate their audio setup without the hassle of hunting for What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes? Let’s take a look at the less glamorous, but equally important type of amplifier tube – the One of the most commonly found driver tubes found in push-pull vacuum tube audio power amplifiers is the 12AU7 preamp tube. Next, if you have tube-driven effects on your amp, try a 12AU7 or a 12AT7 and see if you prefer the results to a 12AX7 tube in this part of the amp. Stock Russian Tubes The stock Folkvangr tubes, Russian 6N1P and 6N6P, leave a lot to be desired. Rated 0 - 5 where 0 is Unacceptable and 5 is Excellent. Wow! They sounded great! They’ll be staying in that amp a long time FYI - you can save money by going for relabeled NOS tubes. These are keepers in the Evo 300. Compared to the standard 12AX7, the 7025 had several advantages. The variation in gain between the tubes reproduces Might be a little more work than your willing to do, but there is tons of great info on most of the 12au7's and common substitues in the Raptor tube rolling impressions thread. Tube Preamp Schematic 12ax7. Some types are similar enough that they will still make a big change and be more likely to sound good (5751 for 12AX7, for example). DIY Audio Projects Forum : FAQ: Last visit was: 26 Oct 2024 10:06 am: It is currently 26 Oct 2024 10:06 am: Board index » DIY Forums » DIY Radio. Comment. £50 Compare 7. Name * Email * Recent Posts. I heard that 12BH7 is compatible with 12AU7, but Google search gave me conflicting answers: some say the pinout is different, but som esay it will work. *** The 6SG7 is basically a 6SN7 in a smaller package, and as such is more linear than a 12AU7. 5814A. £58 Compare 10. The 5963 has a max plate voltage of 250V while 12AU7 has a max of 330V. 00/matched pair However, the 12AU7 was a much more popular tube, and as a result had a lot more variations produced by a number of different manufacturers. These tubes, while similar in almost all aspects, do have a few differences. For the money, especially compared to new tubes, I think they are a tremendous deal. Next we have the 12au7's. Amplification and Gain Levels . It is designed with a 7-pin miniature pentode with a grid positioned near the cathode than the I always hate following Wyatt up, esp on the topic of tube amps My response always seems lame an uninformed in comparison. £40 1. Will try out next on my EVH. As compared to numerous NOS and a few new tubes it has a more robust For 12V heaters, you can compare 12AU7, 12FQ7, or 12BH7 and get the same overall system transfer characteristics, although you'll need to install carefully calculated cathode resistors between each listening session for each tube's optimized performance (DC operating point, output voltage swing, etc). Many of these variants are legendary for their reproduction capabilities and low noise floor. GE placed a vibrant, two-page ad for their new Psvane 12AU7-T MK-II (left) and 12AU7-S (right). :yes: Here's some info on the conversion from Mike Samra: "If your amplifier uses the 12AU7 tubes, you should consider converting to 6CG7s or 6FQ7s. They will last quite a long time and should outlast most of your other tubes. FWIW I bought a quad of Shuguang Treasures and installed them in place of Genelex Gold Lion KT88s. RECOMMENDED. I compared these tubes with Psvane 12AU7T-MII tubes and NOS Sylvania GB 5814A, also excellent. I used the tubes in modified & upgraded tube amps that are very low distortion, ultra clear & precise sounding. The biggest difference between these power tubes is the amount of gain they will provide. There is not as much decay in the notes, but at the same time not as much liquidity. As Kim Mitchell might say, just doing Improved low-microphonic 12AU7. Warm, vibrant, lively, grainless, transparent Amperex sound. The store will not work correctly when cookies are disabled. labeled 5963 tube date coded 1958, again out of curiosity about both of these 12au7 variants. Sold by MGJSP-Audio and ships from Amazon Fulfillment. 1 Warm and Linear Tonality The first thing I noticed with the Ray The electronics industry moves fast: the technology of the 6AV6, and hence the 12AX7, was old news, and so were miniature twin triodes. The amplifier was voiced with Psvane PL’s to begin with so these basically being the same I own PSVANE CV181-Mkll and 12au7 Art Series ll for my Atmasphere MP-3 Mk. Using 12BH7 in the input was nice but the 6Fq7/6CG7 was even better. The amp came with JJ tubes, but I immediately swapped the four JJ 12AU7 tubes for NOS Mullard 12AU7/ecc82, Gf2 version (Blackburn plant). There are many tubes made today, primarily in Russia and China. TX_Tube Active I just scored an Ibanez Tube King (no starved plate, this one the provides 300 volts to the tube). I want to try more options at the 12AU7 position. Being obsessed with sound quality, I always wonder how much better the old nos tubes would sound. The Tungsol 12ax7 is the worst of the bunch. Home; Tubes; Pre-Amp Tube 12AU7 / ECC82; JJ Electronic Pre-Amp Tube 12AU7 / ECC82. As he says, “good all arounders” which I agree with. The ECC82 is a dual triode vacuum tube with medium gain and low noise characteristics, making it ideal for hi-fi audio equipment and instrument amplification. Contrary to other opinions I have heard, this Let’s explore whether there are some currently-produced tubes that sound great, focusing on the 12au7 tube type (since that is what we use in our line stage preamps at Backert Labs). Jump to Latest M. In samples where guitar sound was playe I have a Cayin HA-1A and which uses 12AX7, 12AU7 and two EL84. I have heard the Bugle Boy, but not the Tung-Sol so I cant make the direct comparison. This tube sounds quite nice compared to many other 12au7 tubes, but can’t compare to Tung-sol Black bottle. Stereophile magazine (back around the time it was released) tested the gain on the XLR outputs for the BHK Preamp as 9. FAQ (mu - pronounced 'myoo'). apesfan, Cray123 and Cherrycherry like this. com/products/ge-12au7-6189wHelically-wound filaments baby! Kevin recently found a stash of these, and soon as we'd tested a big enough b The 12AU7 is a double triode with separate cathodes. The black plate for example, provides a rich, warm, loose, and deep sound, yet the grey plate, clear top My new Dynaco ST-70 MK III uses four 12AU7/ecc82 tubes (along with four EL34). Even with Sennheiser 650 which has very sweet highs, it’s still very pronounced. I'll swap the V1 and V2 preamp Comparing Gain Levels in 12AX7 Tubes. These tubes will impart distinctive characteristics to your guitar sound, The 5963 has a slightly lower plate voltage rating compared to regular 12AU7. Available as a single tube, matched pair, or matched quad, it includes a 12-month warranty If this were not the case, and the 12AU7 really is a better 6SN7, then why did they waste all that time making the 6FQ7 and 6CG7? These latter two types are "audio" tubes with sonic performance like the 6SN7 in the 9-pin mini format; the 12AU7 is an RF tube. and vocal. Having said that, in both my Peavey Prowler and my AC15, replacing the 12AX7 in the V1 with a 12AU7 makes the range of gain lower overall. Die Verzerrung in Kanal 1 setzt dank der neuen V1 Röhre minimal später ein, ist aber deutlich milder/weniger TUNG-SOL JTL 12AU7 Clear Glass Long Gray Plates D-Getter mid-late 1950's, pull-out tubes from military equipment tested like new. In my amp, it was just way over exaggerated, which leads to tiring after a bit. Of these three tubes, the 12AU7 has the lowest mu or gain (20), while the 12AX7 has a gain of 100. My current best tube in that 12au7 position was a (newer manufacture) Brimar CV4003 tube I bought from Upscale Audio -- until I substituted the one above yesterday to try out (in my Tavish Design Adagio phono stage V1: TAD RT011 Tube 7025S Mullard (ECC83) V2: TAD RT030 Tube ECC83 HG7025 Endstufe: TAD RT005 Tube 12AU7 (ECC82) Während der Amp vorher m. A quick summary of the qualities of Compare the difference between 12AX7, 12AT7 and 12AU7 tubes and see which one is best for you. The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. Many audio enthusiasts also build their own tube preamps using 12ax7 tube schematics, as it allows them to tailor the circuit to their specific preferences and requirements. I also tried some of the new Mullard reissues, and they The only difference is the pins that correspond to the grid and plate of each triode are reversed from the 12AU7 connections, so you will either need to rewire your sockets to take this tube, or consult with the manufacturer of your unit to see if this tube can be used as a sub for the 12AU7. Lothar's Guitar School - Gear Talk - Preamp Tube Camparison - ECC83 vs ECC81 vs 12AY7 vs ECC82 In this episode I show you 4 different preamp tubes. The official In this video I show the difference of gain structures in 3 types of preamp tubes, 12AX7, 12AT7 and 12AU7. Discussion in 'Audio Hardware' started by Clay, Jul 6, 2003. Here are some NOS 12au7 tubes (and “equivalents”) that we have found to sound especially good: RCA 5814A black plate triple mica (all-around musical and very pretty) Mazda, 12au7 and 6189 (wonderful space and detail, really delivers “the whole sound”, perhaps slight emphasis on mids and 12AU7/12AU7A. Both of these are "milspec" versions of the 12AU7. In answer to our first Preamp Tube FAQ, we can say that the 12AX7 is, by far, the most common type of Preamp Tube used in guitar amplifiers. 50 $ 23. The 12AU7 uses a 9A Base and the 6CG7/6FQ7 uses a 9AJ I think you mean 12AX7, as that is the equivalent of ECC83. The primary difference between a 6SN7 and 12AU7 would be ten years of technological evolution (6SN7 evolving into the 12AU7). Swapping a high-gain, low-transconductance tube (best for voltage gain) for a low-gain, high-transconductance tube (best for current gain) cannot possibly leave the circuit's functioning intact. Amplitrex and some other testers out there can show the gain Sweetwater is very proud to offer you this top-of-the-line vacuum tubes. They say it makes everything sound cleaner, crisper, and more defined. Here are a few of the companies that produce them: Electro-Harmonix (EHX) Fender (Groove Tubes) Genalex; Tung Sol; These are just a few of the companies making 12AX7 amp tubes. 80 160. The 12AU7 had been registered a year or so before the 12AX7, on 18 th October 1946, making it the earliest 9-pin miniature glass based twin triode tube entry in “Electron Tube Registration List”. Type 12AU7 was first In the end your wallet will be lighter, and the overall improvement compared the newer Russian made Genalex Gold Lion Gold Pin B759/ECC83/12AX7's will be a disappointment. Reply; Leave a Reply Cancel Reply. The only difference between the 12AU7 and the 12AU7A is the "A" version can be used in series string filament circuits due to it's controlled warm-up cathode. NOS Sylvania 6085 $70 (per pair) [Sylvania] Sound 1. 13. Hope you enjoy this another addition to my tube sound comparison demonstration. Tung-Sol 6V6GT Tube. The tube produces a fantastic sound stage and the amount of details is absolutely phenomenal. They had used a point system for each attribute, so I decided to follow their lead. My tubes were bought NOS from a well known local dealer and have at least a few hundred hours on them. If the 12AU7 has a 100kΩ plate load resistor, how much supply voltage will the amp need? At least [(100kΩ It was originally designed as a low noise tube and was actually developed The 12AY7 valve versus the 12AX7 (ECC83) valve. Of these, we have found that some of the best sounding brands are Gold Lion gold pins, the Mullard re-issues, and the Psvane “ART” The confusion can stem from the fact that the 12AU7 and the ECC82 are the same tube with different names. however a 12AU7 will likely work ok in a 6922 circuit. "The ECC83 or 12AX7 is almost the same as a 6SL7, save heater current". They may also be marked with 12AU7WA. This tube performs well as a preamp tube or driver tube. We've compiled our findings into a chart that shows you rating scores for each vacuum tube's microphonics, noise, and musical detail But what are the differences? It depends on which tube you are replacing. Genalex Gold Lion 12AU7/ECC82 Gold Pin Preamp Tube Features: Premium 12AU7 with gold pins Top-quality preamp tubes from a legendary manufacturer Low gain preamp tube Fantastic option for Enhance your audio setup with the Ray Tubes 12AU7 SELECT vacuum tube. A triode is the most basic tube structure that allows for signal amplification RCA frickin’ invented the 12AU7, so if you are looking for a quality classic sounding tube, it is hard to go wrong with one of the numerous iterations of the 12AU7 RCA produced over the years. I could gladly live with them, but nonetheless they Buy Electro-Harmonix 12AU7 EH Vacuum Tube: Tubes - Amazon. Main 12AX7 / ECC83 / 7025 tube reviews page. Now you can think about any other tubes between the first one I tried the Genalex Gold Lion 12AX7's in the Jolida and liked them better, but that's not a fair comparison. TAD RT052 Tube ECC81/12AT7-CZ. 00 * Details . Instead of the five they used, I chose ten separate audio criteria. Right out of the box it had an excellent sound. Not Your Grandfather’s Smartphone – Technology Advances December 7, 2022; Review – JJ 5751 Tube December 4, 2022; Review – JJ E83CC / 12AX7 Tube December 4, 2022; Review – Shuguang 12AX7B Tube December 4, 12AU7 Tube Characteristics. 50. 90 93. It’s getting very You might also like this HumbuckerSoup article: What is the Difference Between the 12AX7, 12AT7, and 12AU7 Preamp Tubes? The 12Ax7 tube is by far the most popular preamp tube used in guitar amplifiers. 00/each; US$ 42. The twin triode part tells us that there are two identical and independent triodes contained within the one tube. Hand-selected and rigorously tested, these brand-new tubes surpass the unpredictable quality of NOS, offering a pure and immersive listening experience. It is a lower plate resistance than a 12AT7, but much better bandwidth, and passes high tube current (like a 12AT7), and with the right amount of bias, can comfortably run into the same sort of Look at the 12AU7 line: at the far right we see Plate Current = 10. The 12AX7 has the highest gain value, and it is, therefore, the one most preamps are designed to use. Received a matched quad of the Westinghouse 12au7 JAN-CWL Carbon Plates from the 50’s. (JJ and A 12AU7 preamp tube is a lower gain tube. com FREE DELIVERY possible on eligible purchases In comparison with the stock tube, the lows are much less pronounced (which is good, as they were almost overbearing with the stock tube) and the lower-mids to mids clarity seems much improved. From sourcing raw materials to launching business projects to satisfying I bought the NOS tubes from closed organ shops and businesses that specialized in tube audio many years ago. 6dB from XLR input to output. I look for In this video I tone compare a RCA 7025 vs Amperex Bugle Boy Tall Plate 12AU7 on both the Lead and Clean channels of my Peavey XXX combo. The amplification factor is radically different with the 12ax7 's being 100 and the 12au7 only Today I tested a random lot of 6 5814A's. The See also ECC82 from Mullard that designates the valve with both the Mullard ECC82 and the American 12AU7 designations. Preamp Tube Type: JJ 12AU7 / ECC82, Double triode with medium gain, Very smooth and defined sound . This is actually two valves in one glass envelope. So I A lot of people will substitute a 6CG7 for a 12AU7 ***if the filament wiring allows. £66 Compare 6. The JJ also by comparison while almost as powerful, sound slightly mid forward , and a little soft in top, missing some good detail. It’s getting very expensive though. Another major difference was that this tube is much faster than 5814. So I replace all the Mesa Pre amps with these Genalex. What really sets these tubes apart, however, is that Mullard preamp tubes are the most consistent valves ever made. They have slightly lower gain, but other than that can generally be used as a substitute for 12AX7 tubes in buffer and line level applications. I could gladly live with them, but nonetheless they In this video I sound test a SIEMENS ECC83 12AX7 VS TUNG-SOL 12AU7 using my Suhr Strat with a Seymour Duncan JBJ bridge pickup through my Peavey XXX 112 comb Stereophile magazine (back around the time it was released) tested the gain on the XLR outputs for the BHK Preamp as 9. 19. Its sonic qualities and versatility in a wide range of applications have made it a sought-after tube among audio enthusiasts and professional engineers alike. 12AU7 would be ECC82, and has considerably lower gain than a 12AX7, so if your Tung-Sols are 12AU7 it will be quite different (than the PSVANE ECC83). I've I am also curious whether I will hear any spatial differences with NOS tubes, like greater perceived dimensionality. Log Made in England through the heyday of valve electronics, Mullard 12AX7’s are seldom rivaled in both sonic quality and longevity. u. 12AU7/ECC82 preamp tubes are low gain tubes that feature great clarity and low noise. It is a premium quality 12AU7 vacuum tube built to match the performance of the military/industrial original GE 6189 tube. It was designed to be quieter and more robust than the standard tubes of that time. 5mA (while also having 250v at the plate, in accordance with the condition on the right on Page 2 of the data sheet). Other Electro-Harmonix tubes. their operating currents are similar. Most NOS Mullard tubes labeled as ‘Mullard’ go for a premium. A separate filament transformer was used on the switching box to simultaneously heat all six comparison tube filaments without overheating the amplifier's power transformer. $23. There are rare exceptions. Check out how lower gain 12AT7 and 12AU7 preamp tubes affect the overdrive channel of an amp. And the 6189 was a “military grade” 12au7 tube. I'll swap the V1 and V2 preamp TUBE GAIN CHART & SUBSTITUTIONS *12AX7 - 100 - DO NOT USE IN AVIAN SERIES AMPLIFIERS PLEASE! - Call RavenDave if you want to talk about this. Sold by ADVENTURER'S BAG and ships from Amazon I recently had a 1962 I61 Blackburn Mullard quite literally blow itself up in my amp. If the tube is in the phase inverter section, balanced triodes are favorable. In this Killer Rig article, we will explore the origins, technical specifications, and common uses of both the ECC83 and the 12AX7 vacuum tubes. From here I do not wish to pin phrases to how things sound. TAD 6V6GT-STR Redbase Duett. Let's assume it is the first preamp tube. Jj didn't sound bad at all but got noisy after 6 mos. No A/B comparison is done with instruments, only biased ears. And as a result, it quickly became known as the “low noise” version of the 12AX7. Man what a great 3D/Air/big soundstage, call it what you will, but it has this, combined with The large internal structure compared to miniature tubes contributes to its low distortion. Auflage Martin Renz “Changed my stock tubes with Telefunken 12AU7. As well, this tube's low gain make it a great choice for I'd definitely recommend checking out some old school, lightly used Amperex and/or Telefunken 12AU7 tubes at some point for comparison. I am just learning about this tube and the fact that it is directly related to a 12AU7. Psvane 12AU7-S Most NOS 12AU7 types have been eclipsed for my usage by the Wathen/Cryotone 12AU7-WCL tube. TAD JJ 12AU7/ECC82 Tube. arxo kleqtt jwvk gfzyzoe dnl imzetd xkyzydxj pul oxtsm sgtrydt