Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Tiny_Daddy on January 23, 2012, 08:38:56 pm

Title: Epiphone Valve Standard
Post by: Tiny_Daddy on January 23, 2012, 08:38:56 pm

This amp just buzzes. No other sound. Volume pots have no effect. I suspect it's the DSP board which I would just as soon bypass. Anyone got info or a schematic?

Title: Re: Epiphone Valve Standard
Post by: sluckey on January 23, 2012, 08:48:32 pm

Will this help?

Title: Re: Epiphone Valve Standard
Post by: Tiny_Daddy on January 23, 2012, 09:12:59 pm

Yes definitely, thank you.

Title: Re: Epiphone Valve Standard
Post by: plexi50 on January 23, 2012, 10:00:05 pm

I has the same issue 3 years ago with a Valve Special. The OT was bad. I thought it was the DSP board at that time as well but it wasnt. Hope this helps

Title: Re: Epiphone Valve Standard
Post by: Tiny_Daddy on January 25, 2012, 07:55:33 pm

That first op-amp was railed. A new one fixed the amp.