MR7A rectifier high vacuum half wave. Made by Marconi Wireless Telegraph Co. Ltd. Used in medium & high power transmitters.

Physical Description

Cylindrical glass bulb with necks at each end, supported vertically by metal rod on display board. One filament connection on top; the other is a side arm attchment on cylindrical bulb. Anode connection on bottom of lower neck. Exhaust tip on bulb. Filament with side cantilever tension spring.

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