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Test results for Trobbins and Triode K

Voltage across R19 and R21 --- 109v across and all four at 250vdc at plates

R5 bypassed --- music does pass undistorted. low hum both channels with Left a little worse.

Bypass R9 with 100uf cap --- Hum worse in LEFT then drops very low. Hum is still present in the RIGHT but very low. Music passes well

Bypass cap C13/15 to grd leg of R5 --- Hum starts real loud on LEFT then fades. Both have low hum with the LEFT a bit louder.

Disconnect NFB --- Hum starts real loud on the LEFT and fades with low hum in both channels. Music passes well.


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