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A Big Vacuum Tube that lights up without a filament?

Valdemar Gomes VALDEMAR GOMES · AUG 16, 2026

This YouTube video has 3 600 views and was published Aug 16, 2026 on Valdemar Gomes. That is 0.5x the channel's average views.

A Big Vacuum Tube that lights up without a filament? ▸ WATCH ON YOUTUBE
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