Hartke A35 Repair problems

[g1]

Yes, any transistors without plastic backs that are mounted on the heatsink need an insulator.
If the Q9 collector was in contact with the heatsink (ground), that probably explains the excess current through Q4 (via R97).

[Jesse]

Thank you! Things are looking much better!

Replaced Q4, insulated Q9.
Shorted input
No Load
Variac at full AC voltage 120VAC
1.03VDC across R97
0.29VDC at output

Is there anything else I should check before testing again with the 8ohm load?