| ▲ | drum55 5 hours ago | |||||||
xray, photomultiplier and laser tubes are still SOTA. PM tubes in particular have a huge number of glass feed through for the intermediate plate voltages. | ||||||||
| ▲ | SoftTalker 4 hours ago | parent [-] | |||||||
Musical instrument amplifiers still use them as well, at least some of them. | ||||||||
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