Thank you. This is along the lines I was thinking, having looked up the specs on both pairs. I think your #1 and #2 answers are right on the mark.  :dbtu: I appreciate your reply.

Ok that is a great point but don't have access to a scope, when I check all all the voltages they all look good as per the schematic. I chopped stick, pushed and pulled the board, looked for bad traces/connections. The only thing that would stop it was touching the same joint with the meter probe. Without a scope I thought maybe try a change out of those two transistors. I also wondered way he chose the transistors he did instead of what was used in the circuit.This was just as much for the logic behind his suggestion to use the transistor he did instead of the ones called out in the schematic I was just trying to learn something besides the issues with my own amp.

Sorry to revive and old thread but all the info in this tread is what my question is about. I picked up a Fender Frontman 65r for 40.00 dollars that has the exact problem that was fixed in this thread. I bought it knowing it had this problem but wanted to use the cab for a speaker enclosure for a spare  scumback speaker I had. I could save the  time of building my own and I wanted to see if I liked the sound of my freash built 18 watt tube amp with the speaker.  the Fender cab was like brand new also  so I figured I would maybe build a small tube Fender type amp after I was done with auditioning the speaker in the cab. Well long story but before pulling the speaker I tried the amp and I had a lot of fun with it. The amp was a big surprise for me a hard core tube lovin amp person. Well until finally one time turned it on and low and behold this exact problem started. I finally knew what the person who sold it to me was talking about. I found this thread in my search for answers. I could of written word for word the symptoms and touching the same nodes in the circuit and have the amp reset and work again until the issue started again. Now for my question Why did Roly  use the BD139/BD140 transistors instead of original 2SA1013/2SC2383 transistors that where used in the circuit. You can still get these two NPN/PNP transistors. I was going to ask Roly but found out about his passing. I found his web page and read a lot of his info. This was a sad day to the electronics world for he seamed like a very helpful and was a great resource to us younger dabblers. so that is what I was wondering. I have a few thoughts but still would like any one else's thoughts. Thanks for any help and again thanks to Roly and people like him.