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Vacuum tube - Wikipedia
10 Unusual Vacuum Tubes – The People's Amplifier
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The 11 Greatest Vacuum Tubes You've Never Heard Of - IEEE Spectrum
The 11 Greatest Vacuum Tubes You've Never Heard Of - IEEE Spectrum
The 11 Greatest Vacuum Tubes You've Never Heard Of - IEEE Spectrum
Vacuum tube - Wikipedia
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Vacuum tube - Wikipedia
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High power ceramic vacuum tubes encased in metal Stock Photo - Alamy
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It's a high power vacuum tube of some sort, possibly for an x-ray machine, given the context. : r/thisisthatthing
