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FUSED SPEAKER PROTECTION CIRCUITS VS RELAY

H

HankM

New Member
I just finished a full recap on a Karmon Kardon 930. It uses a fused speaker protection. I've rebuilt dozens of receivers and amps. I do one board at a time, and test unit after each. Did the PA board last, and all was fine using DBT and Variac receiver powered up fine, and was excellent, and played long enough for me to test Phono, etc. Suddenly DBT bulb flared and I lost sound. No fuses blew. Now I can only get sound from headphones, running speaker load is like a dead short. I have worked on Sansui 5000 and 1000x with fused speaker protection, the 5000 was many years ago and already had one fried F-1040 PA board. I eventually fried the other PA board too, and scrapped it. I usually am working on units with speaker Relays, amd I missing something on this HK?
 
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