Quad 405 II

[alirezaatarrian]

Hello Guys,

I have a quad 405 mark II and recently I noticed the lest channel is not working anymore. There is no rumble or hum at all.
when I inspected the uni closely I noticed the left board is extremely hot.
what part do you think I need to repair?

Thanks for helping me out.

regards,
Alireza

 

[405man]

Check both fuses on the board, if either has blown I usually find that one or both output transistors are faulty. They amps are quite reliable but they are now more than 20 years old, all the electrolytic capacitors should be replaced but these are seldom responsible for loss of output, I have also had the odd random resistor failure

Stuart

 

[alirezaatarrian]

Thank you. I'll check out the fuses.
Just to let you know, I have already changed the caps.