Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: blues man on June 26, 2010, 08:38:07 pm

Title: reverb problem in 66 vibrolux
Post by: blues man on June 26, 2010, 08:38:07 pm

I'm working on a 66 vibrolux and I just did a complete cap job on it. I'm getting an oddball distortion sound riding on top of the note that sounds like a blown speaker when the amp is cranked in the reverb channel.  I removed the 12at7 reverb driver tube and the problem goes away and the overall sound of the channel sounds much better and it breaks up real nice. I tried 2 more 12at7 tubes and I get the same results. All my voltages seem good. Any suggestions? I changed all the components in the reverb circuit trying to find the problem but no luck. I am also assuming the problem is in the reverb circuit since when I pull the tube the problem goes away. Any help would be appreciated. Max

Title: Re: reverb problem in 66 vibrolux
Post by: blues man on June 27, 2010, 10:30:49 am

I just found the problem. The reverb tank.

Title: Re: reverb problem in 66 vibrolux
Post by: phsyconoodler on June 28, 2010, 10:39:37 am

It's the reverb tank!

Ah,crap,you beat me to it! :grin: