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You mention both voltage and power surges, and refer to several different types of resistors.
Carbon film resistors are not great with handling power surges.
Carbon composition resistors, as one might imagine are much better, but they are scarce these days.
Metal oxide film resistors are often well specified for power surges and for mains use.
Metal film resistors are usually not well suited to power surges.
Voltage surges, insofar as they do not create power surges, are a separate issue, and have more to do with the physical size of the resistor and the details of the film geometry.
Wirewound resistors are probably best suited, especially the ceramic type, however they tend to be bulky, are not available in very high resistance values (the wire gets too thin to be reliable) are generally more expensive, and often have a lot of inductance.
That part is true isn't it?I think I would replace the resisters that had drifted out of spec and leave the rest alone myself, and then decide if I wanted to go further.Resisters are so cheap, you could buy three different kinds and swap them around till you had flux poisoning or something.I have heard good things about the Kiwame resisters.I wonder if an amp sounding sterile after the components are changed means it needs to be set up right? Biased? feedback adjusted, etc?Don't get me wrong, I don't know! Sure would be interesting to research this out on one of those sterile amps.I pulled apart this great sounding 65 princeton reverb the other day and found the stupid thing was dead stock except for the power transformer and NOS tubes.That is going to drive me crazy leaving it stock!Dan