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Ditto about the recapping and deoxit.
Capacitors do not have an infinite shelf life--nor does sitting around for years after years before of use do them any good either. Involved will be filter electrolytics and the blocking and bypass capacitors in the components of the signal path.
Back when I was still a brat I had an old reel-to-reel taperecorder of the Morse brand that a buddy found alongside the street on trash day. He and I cannibalized it--I got the amplifier section and chassis and he got the motor, so we were both happy. The amp sounded pretty good--as compared to the pocket transistor radio I had in the day. That amp and a 12" Utah in a large wooden cabinet kept me happy for a couple of years while I experimented with radio design.
Most of the tubes in the thing bore the name Hitachi, leading me to suppose that this amplifier was Japanese-made. I never have been able to dig up much info on the web about this unit.
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