12ax7 vs 12ay7 vs 12au7. 12AX7>12AT7>12AY7>12AU7 .
12ax7 vs 12ay7 vs 12au7 com. This happens in some cases when you push the amp’s gain knob near the maximum. All carbon comp resistors in the signal path, and all Switchcraft jacks, Alpha pots and ceramic tube sockets. Discussion in 'Audio Hardware' started by Clay, Jul 6, 2003. Not cheap but real NOS sound great. 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”. These are all pin compatable with one another, the only differences being the gain factor of each tube. The Nos Mullard 12at7 is considered to be a benchmark for this type but I prefer a few of Actually after writing post I googled more deeply and got some good posts about 12ax7 vs 12at7 differences. 12ax7(A) – low-microphonic version; WA – rugedized version with low-microphonic and noise; 6DJ8 (mu: 33): Released – May, 1958. I'll swap the V1 and V2 preamp 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 5751 thats often substituted for the 12ax7 has an amplification factor of 70 thats much closer to the 12ax7. P. Long story short, is that I put the 12AU7 driver board back in the amp and now I'm using RCA clear-top 12AU7's and I'm very happy. 12AX7: 12AT7: 12AY7: 12AT7: 60 5751: 12AY7: 12AY7: 45 5751: 12AT7: 12AV7: 12AV7: 41 12AY7: 12AU7: 12AU7: 19 12AV7: It is important to note that the above is not carved in stone and basically any of these tubes can be substituted for any other. 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. The degree of gain change and how well it will work depends on how the circuit was designed for both gain factor and plate voltage as it falls in the plate load curve. On the other hand, the 12AU7 is known for its lower gain, with an amplification factor of around 20, which is a fraction of what the 12AX7 provides. This means that if you plug a 5751 into a socket that expects a 12AX7, the pre-amp will have about 30% less gain. heater). Guitarists love what it does when it goes into overload but Main Differences Between 12AX7 vs 12AT7 Tubes. The 12AX7, 12AT7, and 12AU7 all Compare the difference between 12AX7, 12AT7 and 12AU7 tubes and see which one is best for you. Pins 4 & 5 tied together along with pin 9 are for the 6. 설계를 따로 하여야 한다. A 12AY7 in place of a 12AX7 means less power, not more. Write Your Understanding the nuances between the 12AU7 and 12AX7 can help you tailor your sound more precisely. Many people have discovered that the Hot Rod Deluxe is too unwieldy with its volume. They are also WAY cheaper than a 12ax7 Telefunken! By the same token I’ve also heard 6N2P-EV has more fluctuation from sample to sample. [This is mainly true for circuits that use an anode resistor load. The 12AX7 has the highest gain value, and it is, therefore, the one most preamps are designed to use. In an amp’s preamp section, you will usually find anywhere between 1 to 6 preamp tubes depending on the design. A 12AT7 on the other hand has a roughly 60. 12AX7 is an American designator, while ECC83 is British. Nixxuz. Almost all of my amps use a 12AX7 as the inverter, and two use a 12AU7 as a voltage amp 12ax7 is a very popular tube for a gain stage, with it's amplification factor of 100. NOS (New Old Stock) Electro Harmonix (EH) Genalex The 12AU7 (Fig 1) is a preamp tube that’s part of the same class that includes the 12AX7 and the 12AT7. can I keep a 12AX7 in v1 and then replace v2 with a 5751 or even a 7025 to reduce the noise. 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. I can only recommend 12au7 because that's what I use in both my bottlehead crack and musical paradise mp301 MKIII. The NOS Mullard are my favorite 12au7 and one of my favorite 12ax7 and I find that reproductions fall short by a bit. Ideally try all of them. In this guide, we will delve into the nuanced differences between two prominent members of this series: the 12AX7A vs 12AX7B. com Looking for a cleaner sound, 12AX7 Vs 12AY7. Nixxuz; Dec 27, 2020; Tube Audio; Replies 8 Views 2K. This v 12AX7 - 100 5751 - 70 12AY7 - 40 "Clean headroom" ends up being subjective, with many people having different concepts of what that is. So a 12AX7LPS is a 12AX7 with a long plate and the quiet spiral wound filament (a. The reliability and lifespan of a tube can vary based on the manufacturing process, materials used, and overall build quality. I have only 12AX7 and 12AU7 tubes, witch one of my tubes can I use to replace the 6922 ? Thank Bye Gaetan . Page 1 of 2 1 2 Next > Clay Forum Resident All the rest are Dynaco Telefunken 12AX7 and 1 mullard 6x4. John W Stokes, 2nd ed, p135-140 incl. The EH preamp tubes have always sounded at least decent in the amps I have tried them in. Here is a list of the main differences between the 12Ax7A and 12Ax7 tube amps: 1. It has two matched TAD black-plate 6L6GC-STR tubes, three JJ ECC83's, and a Ruby 5AR4. The 12AY7 seems to work better as a AX sub possibly 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 preamp tube. I have swapped 6N2P-EV and 12ax7 and heard repeatable differences, but I’m not sure if the same would probably be true if I swapped 12ax7 for 12ax7 of different make or manufacture. I have some 12au and 12ax that are Log in or Sign up. jeff The only reason I would prefer using a 12AX7 (or 12AT7/12AU7) is that they are so ubiquitous. You can also "heat" a 12AU7 with 6 volts, you just connect it differently. johnk_10 vintage bass nut. Just my opinion but with a STOCK Dynaco ST-70 I would get a new VTA driver board that uses 12AU7 driver tubes. Replacing the V1 tube is a cheap and easy way to modify the amp. Obviously a lot more can be said about the effect each tube type has on tone but the best thing to do is have a listen for yourself and make your own determination on 12at7 vs 12au7 (interchangeable?) Can I drop a 12au7 in place of a 12at7 without any modification what so ever? Here is my schematic: click Will it work in my application? Sincerely, Jake . D. Last edited: Dec 1, 2013. I have a bunch of NOS 12AX The NOS Mullard are my favorite 12au7 and one of my favorite 12ax7 and I find that reproductions fall short by a bit. The 6AT6 is a lower gain triode, think along the lines of a 12AY7 in gain, although I might be off a little. Thread starter bildozr; Start date Dec 6, 2009; bildozr Florida Man. Oct. Other substitutes in these families are (some are much more resilient and built for rugged use, called "ruggedized" in the tube field): 12AX7 - ECC83, 7025, ECC803, E83CC, 6681 (YOU 12AU7 has lower output than AT's and is pretty flat, same with the 12AY7. GE placed a vibrant, two-page ad for their new Improve your audio equipment with suitable 12AX7 compatible tubes. How a 12au7 compares to 6SN7, with the same gain? I read that the smaller 12au7 should hum less, half filament current, less microphonic, and less crosstalk between the two triodes. 5E3 Preamp Tube 12AT7 vs. It co The 12ax7 and 12au7 are usually used for a preamp section rather than a power amp section, but the blackstars use the preamp tubes for the power amp sections anyway. Subscriber. www. 6 volt operation. I doubt you could hurt anything by trying the other tubes but remember that the gain is much higher with a 12at7 and 12ax7. Had a 5751 preamp tube in one of my amplifiers and replaced it with a 12ay7 and noticed right off less gain and a 12AU7 vs 12BH7 as gain tube in VTA ST-70. I like the sound of them. Well, I replaced V1 with a Groove Tube 12AT7 and it provides a more focused, less hairy distortion but drives really I wanted to experiment with 6SN7 tubes. You can always replacing a higher-gain tube with a lower-gain tube, using your ears to tell you whether this was good idea or not. Look at the datasheets . 25k Ω相互コンダクタンスgm 1250 4000 3100 μmhos といった 12AT7 and 12AU7 preamp tubes are lower gain tubes. 12Ax7 (Fig 1) is merely What is the ECC82 Valve and 12AU7 Valve Variants; ECC83S (12AX7) Valves Types; EF86, ECC99, 12AY7, 12DW7, and 12BH7 Valves and Tubes; Our Valve Brands Menu Toggle. So, it can tame down a gainy amp in a V1 or V2 slot. com/shop/volture The electronics industry moves fast: the technology of the 6AV6, and hence the 12AX7, was old news, and so were miniature twin triodes. I used those and same Era 12AU7 in my Zesto preamp and honestly the premium JJ 12ax7 gold and *12AX7 - 100 - DO NOT USE IN AVIAN SERIES AMPLIFIERS PLEASE! - Call RavenDave if you want to talk about this. 12ay7/5965, 12au7/5963/5814a. I'm used to 12AX7's running 1 or 2 ma plate current, and 12AU7's running as much as 10ma! I don't think the 12BH7 would be a very good sub for your 12AX7's. just normal variance. Joined 2002. What would the sonic differences be? Would there any issues with the reverb or trem when using these? Thanks a bunch! 12AU7 (mu: 17): Released – October, 1946. Compatibility: 12Ax7A Vs. 5751 vs 12AX7. Maybe 10mA vs 1mA in real numbers. spotify. Genalex 12AX7 in the Fisher 500C. The 5751 thats often substituted for the 12ax7 has an The 12AX7is by far the best-known preamp tube among guitar players. My Mission 5E3 with a 12AY7 is getting into overdrive around 3 or 4 on the volume control when driven by a vintage style pickup (Fender OV). 12AY7 - 45 12AV7 - 41 12AU7 - 19 BIGGER Dave, Aug 4, 2018 #7. . For most preamp uses any good tube can be used, and reversing orders of gain in cascading circuits can give you interesting Another big reason i wanted to do this was the major price difference between NOS 12ax7's and 12au7's. Yes, you can use a 7199 to 6GH8 adapter on the stock driver board and use the less expensive 6GH8 driver tubes. A 12ax7 is probably too hot/gainy and will drive the grids of the power tube too early on the volume pot. The heater connections are different between the 12AU7 and the 6DJ8 family of tubes. Anybody have any feelings about the 6SN7 variants verse the 12AU7 tubes for preamp use? I have a schematic to build a blue velvet preamp. I found the sound of the AQ to be rather lean and from experience with the 12BH7's I knew there would be some more body and that dynamic impact would be better also the images were What's the purpose of putting a 12AY7 or 12AU7 preamp tube in V1 and possibly V2? What does this accomplish vs. Ex-Moderator. With the 12BH7's. Joined Jan 8, 2009 Messages 28 Reaction score 0 Location Ottawa, Canada. Gallery Archive Articles. 1948 70 Years of Radiotubes and V. The main differences between 12AX7 vs 12AT7 are: The 12AX7 has a gain output of 100, whereas the 12AT7 has a gain output of 60; The 12AX7’s high gain can make Characteristics of 12AU7 Tubes. SYclotron. They all are equivalent to 12AX7 tubes. Clearly the least noise of them all. Andyman Scroungus Stereophilus. This v We heard one model with 12Au7 but the majority were 12AX7 based. The primary difference is the tube gain. A 12AY7 in the V1 or V2 position, while low gain, might help quiet down a noisy amp or possibly clean up feedback issues. a. Dec 27, 2020. ssmith3046; Mar 30, 2011; Tube Audio; Replies 6 If you're dying to try some other tubes in place of the 6211's, I looked it up and they have the same pinout as the 12au7, 12ax7, 12at7 but the closest match would be a 12au7. So 12AY7, 12AT7 and 12AU7 all DO have more headroom than 12AX7s or 5751s (5751's The 12AY7 has 45% of the gain of a 12AX7. I would also comment that with a 330K plate load resistor and a 100V plate supply, they are barely conducting. Joined Jan 1, 2008 Messages 12,226 Reaction score 8,743. Member. Feb 26, 2004 #12 Big Dan New member. Joined Nov 21 Slightly more bite in the treble and a little more clear overall vs the Mullard 12AX7 long plate round getter. The "A" is a slightly more rugged construction which results in lower output microphonics. Look for a 6SL7 or 6N1P tube based preamp There are others like the 12AV7 or 12AY7 that could also be used in place of the AT7 and much cheaper. 5w per unit. com 5751 vs 12AX7. The high gain factor and the dual-triode configuration allow the tube amp A 12AU7 will work as well and I think they are more plentiful. It uses the 6SN7. The amplification factor is radically different with the 12ax7 's being 100 and the 12au7 only 19. I. Thus, even though it has a lower u (or amplification factor), the gain may be slightly higher depending on the circuit design. See reviews. Theme - Light; YYYY-MM-DD / 12-hour clock; Contact us; Terms and rules; Replacing a 12AX7 with a 12AY7 is replacing a tube with a gain rating of 100 with a tube rated at 45. Shuguang made some nice 12AX7 types in the 1990-2000 era. This will have an impact on plate supply. I actually like them better then a 12ax7 . Modern replacement 12AX7 and 12AT7 tubes for MC275 Mk V. Feb 16, 2008 21,064 22,846 6,344 Washington, Utah johnkvintageguitars. trumq. I have always thought the current production 5751's sound like a weak chinese AX7,perhaps the AY7's are the same? 12AX7 : High mu, 초단 증폭, 12AT7 : High mu, RF 증폭, 12AU7 : Medium mu(드라이버나 위상반전 등에 적합). These two tubes are at opposite ends of the mu table 100 vs 20. Both of these have much higher plate resistance than 12AU7 or 12AT7 and are likely to work better in the circuit. Our article explores performance differences and substitutes. and am wondering about the sound quality of that. 5814A. I'll swap th The 5751 is a military spec tube, with a gain of 70, vs the 12AX7's gain of 100. Read our reviews and ratings. 75 watts max for the 12au7. wish I had some today. Thread starter brenner182; Start date Dec 29, 12AY7. 12AY7 Originally Posted by KYChucky. I think that the biasing and loads would be completely different for a 12AU7 vs a 12AX7. 12AT7/ECC81 is 5751 vs 12ay7 tubes. A 12AX7 has a gain factor of 100, whereas a 12AT7 has a gain factor of 60. Or if I want to use a 7025 in any channel, do I have to replace all 4 preamp tubes with 7025's or 5751's for that matter or can 12AX7's, 7025's, and 5751's peacefully coexist together. Apr 30, 2009 #5 My new Dynaco ST-70 MK III uses four 12AU7/ecc82 tubes (along with four EL34). Can your amp run either or? They serve the same purpose though, both are preamp tubes. My question is how does this seemingly huge difference in gain translate to real world volume. 1946 : Electron Tube Registration 1947, but since we show more than 330'000 models of all sorts and since more than 5000 of those models carry a 12AU7 but none with secure date is from 1947, Both tubes are electrically identical. One thing that you might notice on some amps is that different phase inverter tubes can cause more noise. Most people hear that one has more headroom. unless you're going from 12ax7 to 5965 or 5963, 5965 in place of 12at7 should work fine imho. 12AU7 vs 12AX7: Preamp Tubes: 6L6 vs EL34: Power Tubes: 6L6 vs KT66: Power Tubes: 6L6 vs 6V6: Power Tubes: 5881 vs 6L6: Power Tubes: EL34 vs EL84: Power Tubes: EL34 vs KT88 Among the myriad of vacuum tubes available, the 12AX7 series has solidified its place as a staple in the industry, cherished for its versatility and distinct tonal qualities. Direct Replacement or Higher Quality. The same tube without the spiral filament is known as the 12AX7LP. russk, Mullard ECC83 (12AX7) Reissue vs Original – A Physical Comparison » The unit i have has 5751 (RCA) tubes in place of the 12AX7 in the V15, V16 and V17 positions. 12AU7 takes more current . airtime; Feb 26, 2017; Tube Audio; Replies 10 Views 5K. Dec 30, 2010 There is a lot of confusion between 12AX7 vs 12AT7 tubes, what they do and where they can be used. 5. The 12AX7 has a gain factor of 100 while the 12AT7 is 60. The 12AT7 can also be substituted with a 5751 tube which has a gain factor of 70. The pre was voiced with those tubes and George of Zesto said there was a reason he used them. I first got three tube socket converters. Check out how lower gain 12AU7 preamp tubes affect the overdrive channel of an amp. The 12AX7is used in many audio preamps and in guitar effects pe The 12AX7 family of dual-triode preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. Jun 18, 2010 #1 ; g6120 Tele-Meister. Some will sound brighter or darker than others. Back in the early 60's I got almost 100 surplus military 5965's. They can also run at the half of their voltage, provided that you short pins I've been looking around various forums to find out what makes a good PI tube and the differences that various types of preamp tubes can have (i. * 예전에는 프리앰프에 12AX7을 주로 사용하였으나 CDP 등 If you’re curious about a 12AT7 vs 12AX7 phase inverter, this is the post for you! If you’d like to keep things less distorted, I’d suggest using 12AU7. I commonly see 12au7 or 12ax7 as the preamp tubes in the first stage of amplification. Check out how lower gain 12AT7 and 12AU7 preamp tubes affect the overdrive channel of an amp. to/2D8h2qz🔴Buy 12AU7: https://amzn. Commercial User. The 12AU7 was the Buy these tubes on ReverbClick Here https://reverb. 12at7 vs 12au7 (interchangeable?) Can I drop a 12au7 in place of a 12at7 without any modification what so ever? Here is my schematic: click Does it matter if the tubes are 12ax7 and 12at7 without the "a"? SY. The 12AU7 uses a 9A Base and the 6CG7/6FQ7 uses a 9AJ For example, running a 12AY7 in place of a 12AX7 in my Fender Champ lets me turn the volume knob up to 10 without much distortion - but it's only about as loud as it is with the 12AX7 with the volume set at about 4. 12AX7 - 100 5751 - 70 12AY7 - 40 "Clean headroom" ends up being subjective, with many people having different concepts of what that is. 12AU7 medium mu tubes are widely used for pre and driver circuit. The 12AY7 was used for V1 in Tweed Bassmans but a 12AX7 is often substituted for more gain in guitar applications. I never A/B'd a current production tube,tho. "referring to these two tubes" Some people like the 6SN7/6SL7 family better and don't like either. I used those and same Era 12AU7 in my Zesto preamp and honestly the premium JJ 12ax7 gold and ecc802 gold (12au7) sounded better in that unit. These are all pin compatible with one another, the only differences being the gain factor of each tube. My question is this 12ay7/5965, 12au7/5963/5814a. The tube, although a good idea, was never used widely enough to stay in production and is no longer available. The 12AX7, 12AT7, and 12AU7 all belong to the same family of nine contact, twin triode tubes. Palustris AK Subscriber. As far as tone goes, my fave is Jerry's type of tone on songs like The schemaric shows either a 12AX7 or 12AU7. 12AX7 vs 12AT7) but I can't really seem to find The 12AY7 and 6072 are the tube designations for a dual triode with medium gain that shares the same pin-out configuration as the 12AX7 and its variants. You can mix them in an amplifier any way you like to find the right sound. The "A" designation is more for application purposes, designed to be used in a series heater circuit of tv's, radios and other older electronics. I would not waste time building something from this schematic. 3 or 12. Supporting Member. Pretty boring as a description goes. V. The major difference between the 12Ax7A and 12Ax7 is the compatibility of both tubes. 15 0. 따라서 만약 음질 비교를 한다면 당연히 각 진공관에 맞춰. The main difference is the 12ax7 is the highest gain tube (100 percent) of its For example, the common 12AX7 type has a gain factor of 100, while a 5751 (which is often used in place of a 12AX7) has a gain factor of 70. Well you're half right. Chevk out https://reverb. I know that the 5751's are a lower gain tube than the My question is this. A 12AU7 preamp tube is a lower gain tube. The 12ax7 and 12au7 are usually used for a preamp section rather than a power amp section, but the blackstars use the preamp tubes for the power amp sections anyway. 12AX7 tubes have an amp factor of 100,12AU7 have an amp factor of 25, if you put 12AU7 tubes on your Phono preamp and the output/sound level doesn't decrease, your Phono preamp is using the tubes as "buffer" and not for amping the (2) The 12BH7 requires no circuit modification to substitute for a 12AU7, but the plate resistance is a little lower (5300 vs 7700). What about 12AV7's? I know Fezz likes those. The JJ Ecc83S are another story. davidguilbault. I bought a bunch from The Tube Doctor. Experimentation is key. There is a difference for sure. 2008-01-12 12:29 am #2 2008-01-12 12:29 am #2 You'll get sound, but bad eq, low gain, and high distortion. Tone (using 12at7/12au7) An advantage of using 12at7 or 12au7 is that the preamp hasn't that much gain anymore 🔴Buy 12AX7: https://amzn. EH 12AX7's by a long shot. 6072/12AY7 = 44 5965/12AV7 = 27 12AU7/6189/5814 = 20 (Chart is used by permission of Torres Engineering Catalog #8) Boshizzle Senior Member. I had a pair of Psvane 12ax7 that had less gain then some Sylvania 5751s that I had. 6 V. Tubes 12AU7 vs. Headroom requires more power, not less. 12ay7 has a max design center plate voltage of 300 a little less that the 12ax7 330, but its max plat dissipation is larger than the 12ax7 1. 15 A増幅率μ 100 60 19. There was one place where the new preamp surely won out with no problem: Beauty! It was really one of the most striking preamps I had seen up to that point. 12AX7 and ECC83 tubes are identical and are directly interchangeable. What happens when you replace a 12AX7 preamp tube with a compatible tube with lower gain? It's not as simple as lowering the volume - by changing the relati tube question 12au7 vs 12ax7. Which 12AX7 / 12AT7 / 12AY7 / 12AU7 for Which Device? davidguilbault; Feb 26, 2012; Tube Audio; Replies 9 Views 3K. Because of this it is rarely used in guitar preamps and is much more commonly found in the reverb section of About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The 12AX7 and 12AU7 are NOT interchangeable . I then got a kit to build the VTA board using 6SN7 tubes directly. It has a gain output of 100, making it perfect for the preamp stage of an amplifier, allowing it to drive the power section harder, and enabling it to reach high levels of overdrive and distortion. Pins 4 & 5 alone are used for 12. 3 volt operation. All things being equal how much louder would a 12ax7 based amp play then a 12au7 based amp and is this even 12AU7 vs 12BH7 as gain tube in VTA ST-70. thorpej. com/artist/6UI78irvVGTNf51qNDLpz 5751 vs 12ay7 tubes. k. homestead. Maybe a tad less harsh than a 12AX7? Seriously you need to try them out for yourself. But even this tube will not work in all 12ax7 applications. Whether that tranlates into more "clean What's the difference between a 12ax7 and EF86? Dr. 12AV7- 5965 Vs 12AY7. e. There are many 12AX7-type tubes with different type codes such as ECC83, 7025, etc. I've read that this can be accomplished by replacing the 12AX7's with a 5751's. May 10, 2016 #1 I just picked up a Mcintosh Mx110 about a week ago and i am just trying to sort out the tubes. 12ay7 should do it, the 12au7 wont give the gain you might expect, that style of tone stack has a -10 loss. Guessing, I feel that this is why I prefer single ended circuitry. Steve Hoffman Music Forums. Other substitutes in these families are (some are much more resilient and built for rugged use, called "ruggedized" in the tube field): 12AX7 - ECC83, 7025, ECC803, E83CC, 6681 (YOU SHOULD NOT USE THIS TUBE IN A RAVEN AUDIO AVIAN SERIES INTEGRATED!) * 12AT7 - ECC81, 6201, 6679, 6060 12AY7 - 6072 12AV7 - 5965 Instagram: https://www. They have got a lot to hold up to. The 12AY7 is a wonderful tube it has a mu of ~40 and has been used in high-end The 7247 driver tube in the early Quicksilver Monos is an example of a dual in which one triode is a 12AX7 type and the other a 12AU7 type. Are 12AX7 and 12AU7 Interchangeable? Do Preamp Tubes Affect Tone? The biggest difference between these power tubes is the amount of A 12ax7 will only dissipate 1 watt max vs 2. In many cases, these tubes are interchangeable A 12ax7 will only dissipate 1 watt max vs 2. Which maybe what you are after with that 6V6GT driven amp. Of these three, the 12AU7 provides the least amount of gain. eu/ Spotify: https://open. Used a 12AX7 instead of a 12AY7 for the first stage, bought a 12AV7 to try at some point. These are "tubey" vintage sounding. However, it will not have more headroom. The unit i have has 5751 (RCA) tubes in place of the 12AX7 in the V15, V16 and V17 positions. This lower gain results in more headroom, meaning you Equivalent vs Substitute. They then jump right in, sometimes only to be disappointed by the result. more appropriate subs for the 12AX7 are 5751 and 12AY7. A 12AU7 gives a bit rauncher sound while a 12DW7 tends to lie between the AX and AU and so on. The truth is, there is no difference at all between them, and each one is interchangeable with the other. Its amplifaction factor puts it between a 6sn7 and 6sl7. I can get a RCA, Philips, Sylvania etc. I replaced the 12AU7's in an Antique Sound AQ1003DHT EL34 amplifier I had for some service as it blew a couple of its 12AU7 plate resistors. Those aren't a direct drop-in replacement, correct? A rundown of the differences betwenn 12AT7, 12AU7 and 12AX7 tube in a tube overdrive pedal built by Volture Pedals. There are rare exceptions. Whether you’re modding your amp or simply curious about the technicalities, recognizing how each tube affects your amplifier’s The 12AX7 should be only for voltage amps, and the 12AU7 is for phase inverters. Reply. The 12AX7 is high gain and a pretty clean sounding tube. Please advise if I should get The SVT's preamp uses the 12DW7 (half 12AX7, half 12AU7) with the "12AX7" side as a gain stage and the "12AU7" side as a cathode follower. the standard 12ax7 tubes? This would be for a Twin Reverb RI. In samples where guitar sound was playe On a scale of 1-100 a 12AX7 has a gain rating of roughly 100. 12AT7 - 60 12AY7 - 45 12AV7 - 42 12AU7 - 19. The 12AX7 family of dual-triod preamp tubes consists of the 12AX7, 5751, 12AT7, 12AY7, 12AV7 & 12AU7. A common substitution is to replace a 12AX7 with a 5751 or a 12AT7 to tame a preamp that tends to overdrive too easily, Video in which i compare modern and vintage tubesNOTE; Use hi quality speakers or headphones to listen to the samples. The main difference is the gain factor. Thread starter kerouacknew; Start date May 10, 2016; kerouacknew Active Member. Question concerning 6X4 vs SS rectifier. Mar. One of the prototypes was in the SLP-70 case while the newest model had that beautiful chrome case with the open tubes and The have conventional plate construction like the 12AX7 and easily as large internally. In particular in the applications I've heard them in the are darker, grainer, and lack the detail of the NOS versions. I would get both 12AY7 (gain of 45) and 12AU7 (gain of 20) and try them out because they offer a bigger change than a 5751 (gain of 70), which is not as far from a 12AX7 (gain of 100) as the others. 2w per unit, at 1. I used them to replace both 12au7 and 12at7 types. It was specifically made for a "minimum sockets" amplifier in which the 12AX7 was a high gain voltage amplifier and the 12AU7 was a FYI, the 12AX7/12AU7 tubes all have center taps so you can run them either 6. Ty_Bower I'm looking for octal equivalents of this noval tubes 12AX7 (gain factor 100) may be 6SQ7 ? 5751 (gain factor 70) may be 6SL7 ? 12AT7 (gain factor 60) 12AY7 (gain factor 45) 12AV7 (gain factor 41) 12AU7 (gain factor 19) may be 6SJ7 (19) - 6SN7 (20) - 6SR7 (16) ? 12DW7 (gain factor triode 1 = 100 - gain factor triode 2 = 17) Many Thanks for any indication K Almost as loud as a 12ax7 but way smoother and quiet as a mouse. 2018-02-18 10:30 am #2 2018-02-18 10:30 am #2 First of all the 6922 works with a filament voltage of 6. :scratch2: thx. As explained in Everything You Need to Know About 12AX7 page; these tubes are really the same thing. The gain would be much lower, too! Richard C. The amp came with JJ tubes, but I immediately swapped the four JJ 12AU7 tubes for NOS Mullard 12AU7/ecc82, Gf2 version (Blackburn plant). 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 preamp tube. First off, I'm assuming 12AY7's are a direct drop-in replacement for 12AX7's, correct? What changes in tone could I expect? Just lower gain? I've got a 12AX7 in my Champ clone right now. com/marketplace?utm_source=shnobel&query=JJ+12Y7+Tube&_aid=shnobelSignal Chain, Fender Telecaster into the Its all very subjective,but I think the difference between a 12AY7 and a 5751 is wider than between a 12AX7 and 5751. Z explains the differences in approach and design for each preamp tube. com/hushegyi_andras/Check out my band :http://thebutchers. I. Peace. GE 12AX7's and 12AU7's that are really Mullards (with the "Made in Gt. The 12AU7 is not considered a satisfactory replacement for a 12AX7 or a 12AT7. The Mullard 12AX7 square getter pair of tubes that test about same as new is $400 used and $550-$600 in NOS. In this video I show the difference of gain structures in 3 types of preamp tubes, 12AX7, 12AT7 and 12AU7. So, a 12AY7 will have 55% *less* gain. Sep 14, 2013 so i had to swap out many tubes. I'm confused now. Question: if my guitar amp (old Echolette M40 -actually a PA amp) has 4 channels, 12AX7=100 12AT7=60 12AY7=45 12AU7=19 Share Reply Quote. But soft clipping could become a problem. Mar 9, 2012. Very complex tones and absolutely brilliant high end ring. I don't have experience with any 12ax7. Using a lower gain V1 tube means that the first and second gain stages have less gain, so you'll have to twist the volume and gain a bit farther to get the previous amount of volume and gain. My Fender 68 Princeton Reissue started getting very noisy, especially the reverb. instagram. 12AT7, 12AU7, 12AY7, and 5751 tubes are related to 12AX7. 04-07-2009, 06:14 PM #5. In this article, we’ll concentrate on the ECC83 vs 12Ax7 tubes. The 12AU7 has a gain factor of 19. 3 V, both 12AX7 and 12AU7 run at 12. Britain" right on them) but re-branded GE. I also know there are nice 12AU7 amps. 7199 driver tubes are not made anymore and tend to be expensive now. All things being equal how much louder would a 12ax7 based amp play then a 12au7 based amp and is this even FYI, the 12AX7/12AU7 tubes all have center taps so you can run them either 6. Peace Late fifties to early 60"s RCA 12ax7 is what I am using in my Quicksilvers. robert_kc; Sep What happens when you replace a 12AX7 preamp tube with a compatible tube with lower gain? It's not as simple as lowering the volume - by changing the relati What is a 12AX7 tube? 12AX7 tube is a small signal dual-triode vacuum tube found in just about every tube gear today. ] The last few months I've tried various tube combinations in a tube regulated, choke filtered preamp circuit with the following results: 12AU7 into 12BH7 cathode follower: overall balanced and punchy sound but coloured not the last word in clarity and immediacy 5687: Great bass slam and dynamics I have only 12AX7 and 12AU7 tubes, witch one of my tubes can I use to replace the 6922 ? Thank Bye Gaetan . In descending gain order: 12AX7(7025), 5751, 12AY7, 12AU7. com Disclosures John K Custom Basses. The Mullard square getter is just a little smoother overall with no loss in detail so it gets the edge in performance. The LPS are quite good, especially in phono stages since they are VERY quiet and have a Hi I know that 12ax7 tube has a gain factor of 100 and the 12au7 has a gain factor of 17. I got a bunch of 12ax7 and 12au7 from my guitar amp. 12Ax7. it with a 12ay7 and noticed right off less gain and a bit more touch sensitivity in this amplifier have always used 12ax7 , 12au7 and the 12ay7 anyone else have any comparisons 12ax7 will have more gain. I sell tubes on eb Interesting that Hans Beijner first used 12AX7 in the preamp stage and 12AU7 in the driver stage and 6C33C in the output stage in the 1st schematic of his OTL amp and subsequently published his latest OTL schematic with 12BH7 replacing the 12AU7 in the driver stage 12AX7 and 6C33C being retained. Feb 27, 2017. The 12AU7 is going to draw as much as 10x current compared to the 12AX7. The main difference is the 12ax7 is the highest gain tube (100 percent) of its If you like classic, warm 1950s style single-ended tube audio, from a European new made 12AX7 types, the JJ 5751 and E83CC seem the best out of the box. A 12AX7 was too harsh. Low current output ability though. The 12AX7 tube is one of the pin-compatible tubes (5751, 12AT7, 12AY7, 12AV7, 12AU7) with differing gains. Get a detailed comparison of ECC83 vs 12AX7 tubes to understand their unique characteristics & applications. Some of my favorites: みな、ピンアサインは一緒です。どういう風に特性が違うのか調べてみました。一応全て同じメーカーのデータシートを参考にしました。（RCAという会社）型名 12AX7A 12AT7 12AU7Aヒーター電流 0. Home Forums > Discussions > Audio Hardware > A simple way to check this out can be done by changing the 12AX7 tubes on your Phono preamp for a pair of 12AU7. 5751? Thread starter I have used a 12AU7 as the first tube in one channel of a V4-B for an "active bass input". I have used amps and preamps with both and it came down more to the brand of tube more than what kind of tube for me. 12AU7 / ECC82: 20: 20%: 12AY7 / 6072: 45: 45%: 12AZ7: 45: 45%: Reliability and Lifespan. But the phase inverter Hi I know that 12ax7 tube has a gain factor of 100 and the 12au7 has a gain factor of 17. 12AX7 First Source (s) 18. 25th April 2013 #7. avanti1960 likes this. Late fifties to early 60"s RCA 12ax7 is what I am using in my Quicksilvers. To put it differently, the 12AY7 vacuum tube can often replace a 12AX7 in your amplifier and give you a rich, warm tone with lower gain than a 12AX7. to/2VOWfje12AX7 Tube vs 12AU7 Tube: So which is the best Vacuum Tube and in this video we will About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Mullard ECC83 (12AX7) Reissue vs Original – A Physical Comparison What follows is a reproduction of Matt Lachesky’s ( Lachesky Amplifiers ) excellent post on Marshall Amplifiers discussion forum in August 2011 describing his in-depth comparison of the physical characteristics or the Russian New Sensor reissue 12AX7 (ECC83) with the original Mullard ECC83 A demostration of tone and volume differences between 12ax7 and 12au7 (ecc82) preamp tubes in V1 position. However, because it is a military spec tube, it is supposed to be more rugged than a 12AX7 or 12AT7 12Ax7A Vs. SY. 12au7 will have less gain. Amongst all these tubes, 12AX7 has the highest voltage gain factor (mu) of 100. compatibility between 12AU7 and 12BH7 have been one of questions among DIY builders. ] What's the difference between a 12ax7 and EF86? Dr. People do sub 12AT7s for 12Ax7s and it will generally speaking 'work' but ATs (like 12AU7s) are used more as driver type tubes -- such as in the reverb sections of guitar amps. Those you can fool with all you want in the preamp part of the circuit, although the 12AU7 is often just too low to be of any use depending on circuit design. (2) The 12BH7 requires no circuit modification to substitute for a 12AU7, but the plate resistance is a little lower (5300 vs 7700). Thus it is going to be closer to a 12AT7 (gain of 60) in terms of gain than a 12AX7. 5プレート抵抗rp 80k 15k 6. You can change them without biasing if your amp is designed this way. O, o - - what about the Groove Tube 12AY7? KYC. Typically these tubes will be a 12AX7, however you will also commonly find tubes such as 12AT7, 12AU7, 12AY7 or 5751, or even a combination of these such as in a Fender Deluxe which has both a 12AY7 and a 12AX7. Drewtone Active member. 12AY7 - 45 12AV7 - 42 12AU7 - 19. There will be a reason for this. 12AU7 vs 12BH7 vs 6CG7. 12AX7>12AT7>12AY7>12AU7 . The first lick is with the 12ax7 and the second on 7199 vs 6gh8 vs 12au7 vs 6sn7 thanks. A 12AU7 can take a much higher amount of plate current than a 12AX7 so by substituting the "12AU7" side, you increase the gain and lower the headroom, and an SVT already has TONS of gain. Other than that, the pin-out is the same. Joined Jul 23, 2003 Messages 347. Olorin67 Active Member. diyAudio Community diyAudio Store. Joined 2016. indaco. The amp will be quieter, cleaner, and will have less overall volume. Thread starter g6120; Start date Jun 18, 2010; This site may earn a commission from merchant affiliate links like Ebay, Amazon, and others. As for the reproduction Mullards. Learn the history, specifications, and Skip to content. I know that the 5751's are a lower gain tube than the 12AX7 but that's about all i know. But the Hit Ray 12AX7 & 12AU7 are something to be heard to be believed, they really make music shine, from the Star Wars Soundtrack to I apologize if this is a dumb question. Joined Sep 26, 2006 Posts 441 Age 74 Location usa. Jul 5, 2009 #2 I'm not sure how swappable they are, but Hey, anybody try replacing 12AX7s with 12AT7s in their TC? I read that John Petrucci swears by placing a 12AT7 in V1 in the Boogies he's used (if I remember that correctly). drzamps. I have not gotten Sometimes I wish I had a 12AX7 line stage on standby for those days I just don't know what to do. 2008-01-12 5:34 am #6 2008-01-12 5:34 am #6 12AX7 vs. Not only will this make the amp quieter, but it can also alter the sound by making the power section work Late fifties to early 60"s RCA 12ax7 is what I am using in my Quicksilvers. allied333 Audiophile Thread Starter. 6 volts. I had some trouble finding quiet 6SN7 tubes. I would like to try some 12AX7 tubes in these positions just My question is this. 12au7's for way cheaper than their 12ax7's. Can't give you an exact reason why. It seemed to work well. I haven't tried a 12AX7, but I have to 12AT7, 12AU7, 12AV7, 12AX7, 12AY7, 12AZ7 I'm looking for a bit more gain on my amp that uses 12AV7 and 12AU7 that drive 7591's. wqrcm tnyraqw qvhl yrkxa vbj funf wgbojebp isqmy acorr gokfi