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Hello, all! I recently completed a Triwatt build. While I love the clean tone on this amp, especially with KT66's(!), the overdrive only sounds good about halfway up. Beyond that I start to experience some weird octave-up effect like a fuzz pedal. Was hoping someone would have some suggestions for me to fix this. Here are some pics. I know they are not the best and I can attempt to take more if that would be helpful.

More Pics:

Anybody?

Cant say I've ever heard this but try placing the coax to the OD switch Above the board, not below it.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks! I'll give that a try.

Maybe shorten up some of the leads around that tube as well.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Also a number of the solder joints on the turrets look suspect to me.

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Great tones come in small glass jars!

So I reflowed most of the turrets and moved around some wires all to no effect. Replaced V2 with other tubes without effect. Finally I decided to put a 12AX7 in the PI position instead of the 12AT7 I had in there so I wouldn't have to drive the preamp so hard to get good distortion. Now it's all good. Don't have to turn the overdrive past 2 o'clock to get pretty saturated distortion, but I still have plenty of clean headroom, too.

Good news. Possibly the AT7 was suspect though. But as long as you like the result, that's the objective.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

While I'm at it, can anyone explain why the pre-PI MV on this amps works so well? Although the amp sounds best when cranked, it sounds pretty convincing at lower settings on the MV as well.