@willmarchant , to be clear, I was not suggesting your issue is cap related, I was only relating the method I used to troubleshoot my amp. But before I got to the caps I checked (most of) my resistors & all diodes. In case you ever need to, there should be a setting on your Fluke for caps, but I understand that a cap checker is more definitive (at least that’s what the guy on AA who was helping me troubleshoot my amp via emails told me) so I bought a cheap one from Amazon. However, and not to digress too far, if you do ever check your caps with any kind of meter, either give them a day or so to discharge or get a shunt to manually discharge them, or you will fry your meter.
Anyway, yes, I do think that the resistor that is showing 0 ohms is your problem, but I do not know enough about them to tell you how they work internally. I have no doubt that many on this board do, & I will keep my eyes peeled here so I can learn also.
When one of my ARC VTM 120s would blow a grid resistor, it was easy to know because it looked and sounded like a Lady Finger firecracker had gone off on the CB. I used to grit my teeth & cross my fingers when I turned those thing ’on.’ I had ARC send me a bunch (I think that they were 75k ohms, from memory) that I kept on hand. But that doesn’t mean, I don’t think, that they cannot fail less spectacularly.
The value of the resistor will be identified by it’s color and the stripes on it.
Good job on (probably) figuring that out!
