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Hi Nathan , Welcome to VK . That's a sweet looking radio / amp ya got there and bonus points for it coming with the schematic . You mention one of the EL84 outputs possibly red plating . As you know any of the resistors could and most likely have drifted in value and most if not all of the electrolytic and paper types of capacitors are suspect as well .
Something curious I noted on the schematic , the circuit calls for 415 volts on the plates of the EL84 outputs , and yet every tech sheet I have on those tubes lists a maximum plate voltage of 300 to 330 volts , depending on if it's RCA's specs (300V max) or Phillips or Mullard's (330V max) . Are the really standing THAT hard on those tubes , pushing them that far over their design rating , to get a maximum output level , tube life be damned ?
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