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FDP Forum / Amp Mods, Repairs, and Projects / 12AY7 in V1 instead of 12AX7

Guitar Fool
Contributing Member

Sunshine State

What is wrong with men being men?
Apr 11th, 2019 08:16 AM   Edit   Profile  

My eyesight ain't so good any more but at least me hearing is still there....

I've found that the lower powered amps I've owned with the 12AX7 in V1, are too "aggressive" and come off as sounding harsh especially with humbuckers..

but inserting a 12AY7 really tames them

and at the same time my larger wattage amps don't seem to suffer from this...

I know this isn't anything new..

that being said..any of you guys prefer the higher gain in stage 1?

Doc Sarvis
Contributing Member

USA/Salt Lake City

Tuned Strings and Tight Lines
Apr 11th, 2019 09:30 AM   Edit   Profile  

After tinkering around I've settled on 5751 exclusively for V1.

Contributing Member


Apr 11th, 2019 10:17 AM   Edit   Profile  

I'm a 12AX7 sorta guy.

I do have one amp that sports a 12AY7 in V2 to tame the gain. It is an insane gain monster with all 12AX7s.

Guitar Fool
Contributing Member

Sunshine State

What is wrong with men being men?
Apr 11th, 2019 08:36 PM   Edit   Profile  

I've tried the 5751 too...I like it but I just had one fail....now I'm down to just one...and they aren't cheap to come by....

but I have a good supply of the Ay7's..

"It is an insane gain monster with all 12AX7s."

Oh I hear that...and if you have an OD pedal in front of it...look out!

Contributing Member


Apr 15th, 2019 05:51 AM   Edit   Profile  

I prefer 5751's
You can have one of any type tube fail including 12AX7 and 12AY7's


Paris, France

It's just a guitar, not rocket science.
Apr 16th, 2019 04:03 AM   Edit   Profile  

I have a 12AY7 in V1 of my amp. There was just so much gain available with a 12AX7 that I rarely had the gain knob above 3 1/2 (because I run the amp almost clean). The 12AY7 means that I can now run the gain knob up to 4 or 4 1/2. Other than than, the amp sounds and reacts identically.

Contributing Member


Apr 18th, 2019 08:42 PM   Edit   Profile  

I prefer the sound of a 12AY7


usa Thumb area Mi

May 18th, 2019 05:27 AM   Edit   Profile  

I use 5751 or a 7025 in most of my amps in V1

That said I have 12ay7 in v1 of a 5e3 x2 (only tube I'd use in v1 in a tweed)

and I've found the 12ay7 in v2 with modern Fenders like a Bjr or a HRD works best for me.

Contributing Member

Planet Peegoo

Rhythm & Lewd Guitarist
May 19th, 2019 05:54 AM   Edit   Profile  

The 5751 tube is a ruggedized version of the 12AX7 developed for military applications. They're designed to be extremely low-noise and have specs similar to the 12AX7; many are slightly lower gain than modern 12AX7s.

Contributing Member


May 25th, 2019 07:10 PM   Edit   Profile  

I use a Russian EHX 12AY7 in VI of my Excelsior Pro and like the change from the 12AX7. A little smoother with single coils in this amp.

FDP Forum / Amp Mods, Repairs, and Projects / 12AY7 in V1 instead of 12AX7

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