Nice to hear. As per the service manual, Adj R7 on module for 15mV(34mA) across R263/Q4e & R265/Q1e which represents about 34mA of bias current (0.034*0.44ohms). It can be increased to be as much as 80mA of bias which would be 0.08*.44ohms=35mV, with increased HS temp, but I think that there is lots of margin in this design. Use some retractable clips so it is easy to connect to your DMM. Volume is to be set at zero, wait about 15 minutes for the HS to warm up and the ckt to thermally stablize.