No doubt Brandon will answer. But, if your network needs to be 320K and it is 290K instead, you need a make-up 30K somewhere. I believe most people set their trimmers between maybe 15-10K to ground and 50%, so Brandon surely split the difference and put a 15K tail to the trimmer and the other 25K before. C2 will be loaded identially to what it would have been if the amp had a 100K trimmer in series with a 220K resistor. You may want to draw yourself a little sketch to see what's really going on in the amp.BobW wrote:OK I see it, it's not a trimmer, just 15Ks before the 220K and from 100K trimmer to gnd.
Funk, I do have a few dumb questions:
How did you arrive at determining a 15K was needed before the 220K and at the gnd side of the trimmer? Is this to unload CL2 a little more and/or the OD entrance or exit? Did you determine this with your ears or waveforms. I stumped.
Cheers,
Gil