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"Recently Serviced" says the ad for a second-hand amp. Yes, but what does that mean? New valves? Biased?In my experience it means sprayed with Lynx aftershave or Febreze. What about you?
to me a service is checking of bias and matching, if not new power tubes, and checking everything is in order electrically. I presume this means checking the drift on most of the amps components or at least inferring their drift from some measurement of a subsystem.
My most recent Amp was checked over once i got it, and he changed out the screen resistors because they'd drifted marginally.
I always find it amusing that sellers describe a run of the mill solid state amp as being recently serviced. Yes I know you can give scratchy pots a squirt of Servisol, but no way can you call that a service.