12ay7 gain factor However, it will not have more headroom. While these tubes are all interchangeable, most have different internal resistance and operating specs. The 12AY7 was used for V1 in Tweed Bassmans but a 12AX7 is often substituted for more gain in guitar Maybe the limiting factor is the output section of the amp, or something in the preamp, or the phase inverter, or the extra gain stage of the PR, or the bigger drag of the whole reverb circuit. 12AU7's 12AY7 is the low noise tube, high gain tube from this family, and even less were made than 12AX7. The In that case the amplification factor is diminished to 1,6 mA/V * 24 kOhms = 38. It is The reason is double, the first as you have guessed is about the amp on my other tread that ask for a 12AY7 as V1 there I indicated 12AY7 or 12AT7 because the original schematic uses a 12AY7 with the triodes paralleled, giving a bit more gain than the single triode, so I was thinking to the 12AT7 that has a bit more gain as my version use one triode for each channel 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. It has more headroom, breaks up much later, but sounds very sweet and smooth when pushed. From our review: "Sonically the tone is all American, making it an affordable alternative to NOS. 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 The 12AX7 has a gain or amplification factor of 100 (1 volt in = 100 volts out) where the 12AY7 is only 44 so there’s not as much signal hitting the next gain stage. 5 12DW7 = 100 and 17-20 The 12AY has a little more than twice as much gain as a 12AU7, but a little less than have as much gain as the common 12AX7. 12at7 has a bit less gain. K. The 12AX7 has a gain factor 100, the 5751 has a gain factor of 70, and the 12AY7 has a gain factor of 40. It will overdrive the preamp section going into the power amp and cause The 12AX7 is by far the best known preamp tube among guitar players. Jun 18, 2010 #3 ; stax Tele-Afflicted. The 12AY7 is a lower gain (gain factor 45) tube commonly used in very early Fender amps from the 50s. The 12AY7 is a double triode designed for low level audio amplifier stages the equivalent 6072A is also marked on the glass. 5. The 6SN7 is much lower gain at amp factor of 20. 12AT7 have a gain factor When to Buy a 12AY7. Me www. Approximate gain in mu: 12AX7 - 100 5751 - 70 12AY7 - 40 "Clean headroom" ends up being subjective, with many people having different concepts of what that is. And, remember, the greater the BW, the more “sparkle” and “chime” we’re likely to perceive. Putting 12AY7 in the place of 12AX7 would probably not be too radical a change and may improve things like noise and microphonics. This tube has a 40% gain factor compared to a 12AX7’s 100%. The gain factors for each tube are (approximately): 12AX7 = 100 5751 = 70 12AT7 = 60 12AY7 = 40 12AU7 = 17. How is this information useful? If you have any amp that is producing too much gain with 12AX7 preamp tubes, 12AY7 have a bit less than half the gain of a 12AX7, which allows us to turn the amp up louder before the distortion sets in. The latter is described as being for industrial and military applications that are critical as to microphonics and It is usually not as easy as swapping out a lower gain tube for a higher gain tube. zaphod_phil Builder, Admin Posts: 15208 Joined: Wed Mar 19, 2003 8:00 am For example, many of the Tweed-era amps use a 12AY7 in the V1 position. ) I ran one in my Ampeg Jet II for years before it finally gave out on me a few months ago. A common substitution is to replace a 12AX7 with a 5751 or a 12AT7 to tame a preamp that tends to overdrive too easily, Electrically, 12AV7 is a hybrid of 12AY7 and 12AU7. 12AT7's ,5751,12AY7,12AV7 and even 12AU7's. When pushed, this tube produces a softer, The 12AY7 has about a 43:1 ratio IIRC. There are usually only two reasons: To replace an existing 12AY7; To reduce the front end gain of an overly loud amplifier. 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 distortion. The lower gain is a factor but the larger factors are: • We have almost 10 times the current available to drive the output tubes before the phase inverter starts to break down. A 12AU7 will really allow you to crank the amp, but it'll also cut back a lot on the liveliness of the overall tone. That is, a "gain dumped" 12AX7 (to 12AY7 gain levels) would have at least X3 the distortion - of a non-gain dumped 12AX7 Combining these two (estimates) I would conclude that a "gain dumped" 12AX7 would probably give you something like 6 times the distortion of The amplification factor is radically different with the 12ax7 's being 100 and the 12au7 only 19. 12AY7 / 6072: A lower-gain tube, offering 45% of the 12AX7’s gain, but provides a more dynamic and open sound. 12AY7 gain is around 40. If you are The tube has a 9 pin noval base. Compared to a 12AX7 (gain factor 100), the 12AY7 has a gain factor of 45. With a gain factor of 100, it's also the hottest tube in this Output Gain Factor. The amount of gain produced by a 5751 is also lower than the 12AX7. Here the plate curve diagram from the data sheet: The RCA 12AY7 shows a nice glow in operation. By the way, here are the specific gain factor ratings—the measures for how much a tube amplifies the input signal even as compared to the lower-gain 12AY7. The 12AU7’s role in your amp could be: As others have said, a 5751 will do nicely with very little gain hit. Read comparisons and Or, you can say that the lower the first stage's gain factor, the more you'll have to turn up the volume/gain knob to get to the same distortion level. A no-no. I have never tried that or needed to, but why not give it a shot. Your standard model has a gain factor of 100 whereas the 5751 is 70. Try a couple different ones and see what you think. 12AY7 µ = 40 12AU7 µ = 17 12AY7 or 12AT7 as preamp tube – Less preamp gain. It isn't only the gain factor that determines performance. if looking for less gain - say between 60 and 40 - what would be the best choise for a microphone Factors such as rarity, manufacturing costs, and demand can influence the price and availability of specific tubes. These are all pin compatable with one another, the only differences being the gain factor of each tube. com 12AY7/6072 R. The 12AY7 is a double triode designed for low level audio amplifier stages. Here's the gain factors for some members of that family of tubes: # 12AX7 (gain of 100) # 12AT7 (gain of 60) # 12AY7 (gain of 45) # 12AU7 (gain of 19) So using tubes other than a 12AX7 will give you less gain, hence less distortion. Similarly, substituting a 12AY7 for a 12AX7 reduces circuit gain by almost half (45%) but nearly doubles the BW. If you wanted to maintain gain levels the substitutes to the right might be best, but results will depend on the type of amp and the results you want. 12AV7 can dissipate the same amount of power as a 12AT7 tube. What about 12AX7 vs 5751 vs 12AY7 vs 12AT7? 12AY7s have a gain factor around 30 or 40; so you can use a 12AY7 instead of 5751 or 12AX7 but you get a lower gain and, therefore, a reduced amp volume. It's been a while, butyou'll get a high gain factor out of a 12AX7, and a low Also notice that V2 is recommended as a 12AU7 (30% gain factor) or 12AY7 (45% gain factor). pdf (116812 bytes), 12AY7. 0 x Top. In addition, the tubes also sound different due to different frequency responses. Slight loss in gain, noticeably better pick sensitivity to me, and good compression when cranked up. Much like turning down your guitar 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. F. The only possible exception is that 12AY7/6072As should be used The gain factor of a tube simply measures how much it amplifies the input signal. This means that if you plug a 5751 into a socket that expects a 12AX7, the pre-amp will have about 30% less gain. Reply; Leave a Reply Cancel Reply. One of the big differences between tweed and "transitional" series Fender and blackface and newer "classic Replacing a 12AX7 with a 12AY7 is replacing a tube with a gain rating of 100 with a tube rated at 45. If you want a cleaner and spankier tone you can replace the V1/V2 12AX7 preamp tube with 12AT7 or 12AY7. That's why the most desirable preamp tubes for harp are 12AY7 and 12AT7 The gain you derive from the tube is always less than the potential gain or the spec'd gain factor. On a scale of high gain, low power, to lower gain, high power, 12AX7's would be on one end with 12AU7's on the other end. Amongst all these tubes, 12AX7 has the highest voltage gain factor (mu) of 100. External links [edit]. These tubes have lower voltage gain and different frequency The Chinese (Sino) made Shuguang 12AX7B vacuum tube is a popular choice for high gain guitar amps. Actual gain factors will vary from manufacturer to manufacturer. The 12AX7 has the most gain of the bunch, and the 12AY7 and 5751 are direct substitutes with less gain, which in many cases means they'll distort the early stages of the amp less. However, Diamond Blue Series Reverberockets are not high-gain amps. It is rare, as I understand it, to actually milk a preamp tube for all the gain that is has potential for. Headroom requires more power, not less. It may Does anyone know what the difference is between a 12AT7 and a 12AU7? Thanks. Some people refer to the 5751 as being a 12AT7 because it too has a gain factor of 70. At least 12AX7 was a commercial tube, but 12AY7 was found in few products Posted by u/intheaterssoon - No votes and 12 comments The 5751 has a gain factor around 70 and the 12AY7 around 30-40, so the preamp gain should have cut roughly in half. pdf (161600 bytes) TubeZone: 12AY7: pdf: Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Now that I'm at work and have my receiving tube manual in front of me, the 6SC7 is a "high-mu" dual triode, with an amplification factor of 70 vs the 12AX7's 100. The 12AY7 also draws more current though, which basically “browns” the out amp some, so even though there’s less gain it does overdrive quite nicely which is what gives it This is why tubes such as 5751 (gain factor 70) and 12AT7 (gain factor 60) still provide plenty of gain and crunch even though they are supposedly much lower in gain. The higher the gain factor, the more amplification that tube provides. the 12AT7 has a gain factor of about 60. Substituting a 12AX7 for a tube with another of lower gain factor, such as a 12AY7 will lower gain in the preamp section. The 5751 thats often substituted for the 12ax7 has an amplification factor of 70 thats much closer to the 12ax7. My conclusion from that is maybe a 5th gain stage really isn't needed? I have experienced with 12ax7 and 12au7, and even if a Sometimes the values vary by a factor of nearly 10. A 12AX7 is 100%> Last edited: Jan 2, 2018. Guitarists love what it does when it goes into overload but that doesn't mean it's not usable in audiophile as well. The pre amp now produces an equally loud signal. Preamplifying tubes. Since most tweed fans are in it for the overdrive, replacing a 12AY7 with a Actual gain factors will vary from manufacturer to manufacturer. Maximum plate current will vary between types of preamp tubes. If you're looking to tame a first gain stage that's a little raw and hairy and needs some tightening up, the right 12AT7 might do the trick. Again, the amount of gain reduction depends on From a 12AU7 to a 12AX7, mu increases by a factor of six, while the in-circuit gain only increases by 3. liwgzif ayqqwvd kvsbeg hctvf iinp ufhdf ignfjw lmlrtra bpd kjx mqi tdafyb eawt fvwwwyv jwbx