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The thing about Muntzes is they have SO FEW parts to begin with that if they are not all pretty close to right you're going to have lots of problems. RCAs tend to be on the opposite end of the spectrum...They are so over engineered that they can preform rather well with significant component issues. My plan of attack if that RCA were mine would be to test the tubes, change the caps, see how it works, and then check resistors in any stage that is faulty.
Only resistors I sometimes hit first are PS resistors on sets that may have been powered up with shorted lytics (that can kill PS resistors pretty quick).
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