Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Jonas on August 24, 2019, 07:17:00 pm

Title: HELP with scratchy GAIN pot on new build (new components)
Post by: Jonas on August 24, 2019, 07:17:00 pm

Hi Everyone,

I have a new build underway and I'm almost there, but I have an issue. The amp is similar to a Trainwreck, with a GAIN pot inserted between V1b and V2a.

At the moment, I get a "scratchy windy" noise when the GAIN pot is turned.  All component are new.
 Pots are PEC conductive plastic. 

Any advice?

Thanks!!!

Jonas

Title: Re: HELP with scratchy GAIN pot on new build (new components)
Post by: sluckey on August 24, 2019, 07:21:58 pm

Don't turn the pot.  :icon_biggrin:


Or you could provide some more detailed info.

Title: Re: HELP with scratchy GAIN pot on new build (new components)
Post by: MFowler on August 25, 2019, 07:04:07 pm

I've had a bunch of Silver Mica caps (new) cause volume and tone stack noise so replaced with Sozo treble caps.


Mark