Yea, your right there. I had one 82k resister I tried as R 12. it scales about the same. As a driver I did not hear a difference. Perhaps when I get the bigger problems worked out, plus I need to make a parts order.
Lowering the coupling cap to .22uf did make a big difference. I ran a low freq. Sweep and there was a slightly rising response from about 30hz or so peaking at 17hz. The .22uf pretty much flattened it out and it sounds much better. More killing a resonance, rather than true low pass. Plus a bit of hum has crept in, when befor the amp was very quiet. Probably fouled a ground up when I was in there…John
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