HP tube ID

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I junked a old HP VTVM a while ago, and a tube in it has med stumped.

it is a 9-pin, and is painted black. The only ID on it is: G73R

I can't find that number, anyone have any idea?

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Topic - HP tube ID - tesla 10:41:20 10/12/16 (7)

Look like these? - FenderLover 18:08:32 10/12/16 (4)

RE: Look like these? - tesla 20:07:00 10/12/16 (3)

RE: Look like these? - Mechans 21:21:28 10/16/16 (1)

RE: Look like these? - tesla 10:03:24 10/17/16 (0)

RE: Look like these? - FenderLover 11:25:12 10/13/16 (0)

RE: HP tube ID - JazzDude 11:02:23 10/12/16 (1)

RE: HP tube ID - tesla 20:08:46 10/12/16 (0)

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