Got an old tube radio that hasn't been powered on in years?
Near Fest is your one stop repair facility.
Dozens of vendors selling parts, and Aesop has a table devoted to powering it on without letting the magic smoke escape. Next is figuring out what tubes, resistors, condensers etc it needs using Aesop's scope, signal generator, voltmeter, etc Get them around the corner at people's prices. With a shot of Foo Foo juice and some soldering at the clinic, many times it can be working before you go home.