Tube Amp Archive

I had this page bookmarked. It shows some Trainwreck Express Clone Oscilloscope photos.

http://home.polstra.com/amps/wreck1/scope/

I just recently completed my first build. It worked, but for a Huge hum problem which was due to improper grounding scheme. No surprise there. That issue has been corrected. I used some transformers that I had on hand a Hammond 274BX power and a 50 watt marshall style output. I'm running about 515 V...

The Les Paul has P.A.F. pickups with the patent pending stickers on the bottom of the pickups. The strat style guitar has a Allan Holdsworth pickup in the bridge position wired and two Duncan Hot stacks for the middle and neck position. I believe the middle position pickup is reverse wound but Im no...

As a follow up to my last post. what is troubling me at this point is why the Humbucking pickup is causing so much hum and the single coils on the strat are not. This may be a no brainer to more experienced amp builders here. Is there a simple explanation for this?

thanks in advance for any help.

Yes. I have the bottom plate and tested the amp with it in place, however, to me there was no noticeable difference.

Hello everyone. I am new here. I discovered this forum while researching a hum problem after firing up my first build. It is a clone based on the A4 schematic. transformers are what I had on hand, Hammond 274BX and Marshall style 50 watt output. Hopefully, a set of Heyboers are down the road. After ...