has anyone here built this successfully?
i've built two and i've tried using 2sk117 transistors and j201s but i get the same result. my test tone is fine through Q1, Q2, and the tone stack but then something weird happens like my test tone drops an octave and i can hear it pulsing along with severe background whine. I get my original test tone on the output, but the volume is significantly lower than the input volume, even with the volume pot at max.
I've tried replacing the 15k biasing resistors with trimmers but it didn't help.
I'm using a 24V laptop-style power supply.
If it only happened on one board i'd say i screwed up somewhere, but i'm getting the exact same behaviour on two different builds. Could it be the power supply is injecting noise?
I've tried running one of those 60 and 100watt class D power amps with the same power supply and when i connect my test tone straight to the input it's clean as a whistle. i've also run a Dr. Boogie with the same PS and it's been fine.