Quote:
Originally Posted by Reece
...A way old timers did it (thank you, thank you) was to wind a number of turns of heavy solder around the tube envelope. Then slide it off, tighten up the turns a bit, and slip back on so it stays by its own pressure. Looks funky but usually works.
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Some early TV tuners used a lead shield on the mixer/osc. tube to quiet down the microphonics. Without it the oscillator tended to "FM" like crazy with every click of the detent.