Before I give up and stick it on eBay, spares or repair, does anyone have a clue what may be the cause of standby mains hum on a cyrus lll amplifier? It is so bad it blew one of our test speakers.
Check the +/_ 15 volt regulators (LM317/377 from memory) They fail.
Design and Content © HiFi Engine 2006-2016
FAQ | Site Policy