The 6CM5 was used as a line (horizontal) output valve in black & white television sets.
The most likely manufacturer of this valve is Philips Australia but AWV also made them for Philips. It is unlikely to have been imported because the designation 6CM5 was mainly used in Australia; in most other countries it was called an EL36.
Probably manufactured by: Philips, Hendon, South Australia.

Physical Description

Tubular glass bulb with octal base and provision for missing top cap.

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