EXCELLENT Do you know what an acceptable, non-harmful range of voltage deviation from the 11.5v might be, as I understand tone variation can be tweaked with the bias?
Great Vid.....i think you have helped plenty of tone-hungry black star users! However, I am still confused, where did the 11.5 come from? is it across all HT range? what about if I want to put KT 77 instead of EL 34?
Great vid nonetheless, we need an "Ultimate Guide" thread
Great video! I noticed that there is a BIAS and a BAL poti on the PCB of the HT Studio 20. The bias is clear, but what does the bal (balance) poti do, and should this be adjusted as well?