Repairing a bryston 3B IV and one channel is distorted and one of the output transistors has an Hfe of 1.5 where as the others is are over 100. It is a BR6522 PNP TO-3 ...no cross, I've read Mj15004 (140v) but all I have is a 2N6584 (80v) the rails are +-65. Should I chance it?