The Vacuum Tube’s Last Stand(s) | Hackaday
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Me electronics for scientists class in 1972 or so used tubes
In the 70s during the CB radio craze people would buy a heathkit 10m linear amplifier and get 1000 Watts from their 5watt cb. They didnt stay on the air long but could get clear cross country. The amp had a pair of giant tubes that glowed proportional to the voice being sent. It was weird

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