12AT7 for PI ?????
- Thread starter OlinMusic
- Start date
the guy who invented fire
Fuzzy. Guitars
Re: 12AT7 for PI ?????
100% safe...it will give you a little less gain in the PI going into the power section. I personally don't care for it but some guys might like it.
100% safe...it will give you a little less gain in the PI going into the power section. I personally don't care for it but some guys might like it.
Buckeyedog
New member
Re: 12AT7 for PI ?????
I used a 5751 in my Marshall DSL to smooth it out some and it worked great. It won't hurt your amp. I think the AT is even lower gain than the 5751. If you don't like the AT, give the 5751 a try.
I used a 5751 in my Marshall DSL to smooth it out some and it worked great. It won't hurt your amp. I think the AT is even lower gain than the 5751. If you don't like the AT, give the 5751 a try.
the guy who invented fire
Fuzzy. Guitars
Re: 12AT7 for PI ?????
The 5751 and a 12AT7 are the same gain levels...
The 5751 and a 12AT7 are the same gain levels...
Buckeyedog
New member
Re: 12AT7 for PI ?????
JAN GE 5751
This is the "option" tube (a little lingo lifted from CART racing from last year...). These can successfully be used to replace any tube in the preamp of a blackface or silverface Fender in a pinch, but are not really suited to the reverb driver position. I'd really recommend using it in the first or second position only (looking at the back from the right) depending on what channel you use. They have less gain and possibly less high end than a 12AX7. The gain factor of a 12AX7 is 100, the 5751 is 70, and the 12AT7 is 60. I like the 5751 if clean is the order of the day. I have a buddy that I run these in the preamp for, because he plays country and wants the amp to stay extra clean. It also helps because he uses high output G&L ASAT's. These things can also smooth out an amp with too much gain for your tastes. Use the 5751 as something different to try. These do work nice in a slot originally designated for a 12AY7. If the 12AX7 is too much for you, these are halfway in between the 12AY7 and 12AX7 on gain. They sound nice in the first position of a tweed Bassman! These tubes are rated to draw a bit more filament current than a 12AX7 or 12AT7. This shouldn't be a problem in an amp, but I'd be a bit leery of using this tube in a tube pedal or otherwise non stout preamp or something. I test these for microphonics and rattle in my Marshall. This tube comes in a white box with military stock numbers on it.
Another view.
While not really a 12AX7, it shares the same pin-out arrangement and is designed for less gain in favor of lower noise and microphonics. It worked well in both test amps and can be used to advantage if your amp has too much grind. One of these should calm things down a bit. The 5751 is an affordable alternative to the 12AY7 used in original Fender tweed amps and can be subbed for a 12AT7 like a reverb driver tube. In this application, you will get good gain with a warmer sound than the 12AT7. The even balancing makes them a nice phase inverter and allows you push the front end of the amp a little harder.
JAN GE 5751
This is the "option" tube (a little lingo lifted from CART racing from last year...). These can successfully be used to replace any tube in the preamp of a blackface or silverface Fender in a pinch, but are not really suited to the reverb driver position. I'd really recommend using it in the first or second position only (looking at the back from the right) depending on what channel you use. They have less gain and possibly less high end than a 12AX7. The gain factor of a 12AX7 is 100, the 5751 is 70, and the 12AT7 is 60. I like the 5751 if clean is the order of the day. I have a buddy that I run these in the preamp for, because he plays country and wants the amp to stay extra clean. It also helps because he uses high output G&L ASAT's. These things can also smooth out an amp with too much gain for your tastes. Use the 5751 as something different to try. These do work nice in a slot originally designated for a 12AY7. If the 12AX7 is too much for you, these are halfway in between the 12AY7 and 12AX7 on gain. They sound nice in the first position of a tweed Bassman! These tubes are rated to draw a bit more filament current than a 12AX7 or 12AT7. This shouldn't be a problem in an amp, but I'd be a bit leery of using this tube in a tube pedal or otherwise non stout preamp or something. I test these for microphonics and rattle in my Marshall. This tube comes in a white box with military stock numbers on it.
Another view.
While not really a 12AX7, it shares the same pin-out arrangement and is designed for less gain in favor of lower noise and microphonics. It worked well in both test amps and can be used to advantage if your amp has too much grind. One of these should calm things down a bit. The 5751 is an affordable alternative to the 12AY7 used in original Fender tweed amps and can be subbed for a 12AT7 like a reverb driver tube. In this application, you will get good gain with a warmer sound than the 12AT7. The even balancing makes them a nice phase inverter and allows you push the front end of the amp a little harder.
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