[Joeztech]

OK, I found the problem - it was a solder splash, probably my own fault. I removed the solder splash then looked at distortion as I turned the volume up. With the original 6K6 tubes in the output stage there was inadequate volume at maximum and replacing the 6K6 tubes with 6V6GT tubes cured the low volume. It now has adequate volume range. I also found that the B+ filtering was inadequate and added a 40uF @ 450VDC to the B+ source that has the orange wire as a distribution bus. That removed the residual hum and it sounds quite nice now.

Now I get to re-install the chassis in the cabinet once again and see how it sounds.

Joe