Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: TubeGeek on April 06, 2010, 08:53:21 pm

Title: 18 Watt PI cap question...
Post by: TubeGeek on April 06, 2010, 08:53:21 pm

It was a while back I read on this forum that there was a difference between the original 18 watt and Doug's Stout in that the 0.022µF cap should go directly from v2 grid to ground instead of through the 47k resistor to ground.

I did this mod last night and it opened up the normal channel A LOT and turned the hotswitch into a thick distortion switch.

I just want to make sure I did the correct mod.  Did I?

Title: Re: 18 Watt PI cap question...
Post by: sluckey on April 06, 2010, 10:10:18 pm

Yes. Your posted layout has the cap connected the same as the original Marshall amp was connected.

Title: Re: 18 Watt PI cap question...
Post by: TubeGeek on April 06, 2010, 10:44:05 pm

Thanks.  I thought I'd check just to be sure.

This mod makes a huge difference and I like it. :headbang: