I'm almost finished building my 2nd LA2a but I'm having a little trouble finding where the root of this problem is... It works FINE as a line amp, but I there's no compression happening. No panel lighting up in the T4 either.
Strange behavior: when I crank the peak reduction pot fully clockwise I get a 2nd-order harmonic distortion--i.e., when giving it a 1K signal, after turning the peak reduction fully clockwise I get a 2K signal mixed in.
More strange behavior: the meter reads output just fine (as is expected), but when set to read gain reduction, the meter drifts up or down in no predictable fashion (not spontaneouslyt, but gradually)--even after the unit is warmed up and the zero adjusted.
Could anyone tell me where I should pay close attention to find why it's not compressing? I've tried just about everything. Voltages seem to check out give or take. Any help would be greatly appreciated!
Strange behavior: when I crank the peak reduction pot fully clockwise I get a 2nd-order harmonic distortion--i.e., when giving it a 1K signal, after turning the peak reduction fully clockwise I get a 2K signal mixed in.
More strange behavior: the meter reads output just fine (as is expected), but when set to read gain reduction, the meter drifts up or down in no predictable fashion (not spontaneouslyt, but gradually)--even after the unit is warmed up and the zero adjusted.
Could anyone tell me where I should pay close attention to find why it's not compressing? I've tried just about everything. Voltages seem to check out give or take. Any help would be greatly appreciated!