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There was one more discolored resistor in there. I'll pull it apart again and pull that one out to see if I have a suitable replacement. I think it was also a wirewound 2w resistor though. I also didn't think to patch audio into the input to see if it would do anything. Guess I'll at least...

Well I pulled the resistor out, looks like it was a 10ohm resistor. Replaced the resistor and tried again. No love. There was one other resistor that looked like it got hot. But wasn't to the point this one was. I might try pulling that one out of the board and replace it. I did notice at...

I haven't found anything on public release for the "A" model. But I did see mention of: TM 11-5820-898-20P. So maybe if there's the -10, 20, -34, exc. it would all share TM 11-5820-898 as the prefix I think.

Trying to repair the AM-1780A I have. I've found resistor R73 is burnt. I've not found the schematics for the A model yet. Also googling the resistor numbers I can make out haven't found a value to replace it with. Does anyone have a TM for the AM-1780a with the schematic or could share what...