"Understanding Electronics: Vacuum Tubes" --- 1970 Educational Film Diodes & Triodes. Video (18:40) | Poal: Say what you want.

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"Understanding Electronics: Vacuum Tubes" --- 1970 Educational Film Diodes & Triodes. Video (18:40) (m.youtube.com)

A Periscope Film.

A Periscope Film.

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https://www.youtube.com/watch?v=bRF7m7mDc5E

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