Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: strangbangthang on May 28, 2026, 08:50:31 am

Title: Pignose G40 power transformer replacement
Post by: strangbangthang on May 28, 2026, 08:50:31 am

I have a humming transformer that only gets worse as the amp warms up, and I suspect it's because the transformer is cheap. I tried putting a band around it & that helps some, but I just want to know if there's a good replacement from either a 40 watt Fender or Marshall that doesn't carry a boutique price.

Title: Re: Pignose G40 power transformer replacement
Post by: ok_state_blues on May 30, 2026, 08:50:22 pm

You could take a look at antek. They are round and come in a variety of voltages. I have used them with great success.

Title: Re: Pignose G40 power transformer replacement
Post by: DummyLoad on June 01, 2026, 12:40:35 am

Quote from: strangbangthang on May 28, 2026, 08:50:31 am

I have a humming transformer that only gets worse as the amp warms up, and I suspect it's because the transformer is cheap. I tried putting a band around it & that helps some, but I just want to know if there's a good replacement from either a 40 watt Fender or Marshall that doesn't carry a boutique price.

If the 3rd party schematics are accurate, the Hammond 290HX should work. leave the yellow CT wire disconnected - Tape off and secure. You may have to open up the PT mounting holes or drill new holes.


--Pete