(25-04-2018, 01:13 PM)Mark Hennessy Wrote: Oh, and people usually recommend checking/changing the 3k3 resistors that drop the supply to the op-amp. I don't think I've come across these failing, but if one does go O/C, that tends to be "exciting"!
Definitely! I've had them fail in my 405 in order to demonstrate the crowbars across the output do actually work and prevented my speaker cones from ending up on the other side of the room
Replace them with 1W resistors.
On the 44 check the through hole links on the mother board. These feed power to the input selector board and if they go intermittent it can cause some interesting input selections.
Keith
