Quote Originally Posted by Sonic Mountain View Post
Yeah I am very wary of mucking about at this voltage level. Basically it’s dead as a door nail. No sound no lights.

I don’t know that it has a standby circuit. It just has the one on/off switch on the fascia and a push switch to change channels.
No sound no lights indicates no power do the heaters light up

The diodes are just downstream from the standby switch in the circuit you linked and if you say there's no standby switch then it's not the same circuit and the cap on the power switch will be there to reduce arcing when the switch is thrown

Marcel will almost certainly provide more info