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tube tester
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this post was submitted on 10 Dec 2023
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Not just guitar audio! I own a tube amp for my guitar and 2 tube amps for driving my higher-end headphones! They are neat little pieces of electronics history, not just in how they run, but also because most of the best tubes are old military surplus. My oldest pair are from 1945 and were made for early army/navy radar systems.
1945 JAN-6AK5 tubes
And high end audio recording equipment also uses tubes.