Pioneer SX-737 Intermittent protect troubles and restoration

This beautiful vintage Pioneer SX-737 had an on-going problem with the protection relay tripping in what seemed like a random way. I spent a huge amount of time figuring it out - but it really is solid now! Join me on the highlights of the fix and an overview of rebuilding three of the main boards. The reason for the problem wasn't what I thought it would be and I'm sure this information can be applied to many other amplifier fixes.

[@ROBERT-z8x]

WHERE DID YOU BUY THE Q-1,2,3,4, TRANSISTORS ?

[@davedrezTV]

This is the ebay seller who is very helpful and responds quickly to all of the purchases I have made. He has complete rebuild kits for many types of receivers.
www.ebay.com/itm/116115594529

[@ROBERT-z8x]

@@davedrezTV THANK YOU DAVE I SAW IT ON YOUR SITE AFTER I ASKED THE QUESTION.