回复 215#misimokus
The quad606 power amplifier is not the speaker protection circuit. Only in the power supply sections joined by a fuse, circuit stability is very high, I can answer some of your questions, of course, is what I know about
回复 218#misimokus
I through search engines
I see the picture you provided speaker protection circuit board introduced on ebay
This is a normally a good design! Worth considering!