Tube ID Help

Tubes Asylum

Questions about tubes and gear that glows. FAQ

I know this is a VR tube but not sure which Ox3-A,B,C,D

it seems like a later RCA tube with the typeface

it has no markings except under the RCA which is 7509, nothing on the glass

I have googled

TIA

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Topic - Tube ID Help - Grinnell 16:02:13 01/07/21 (2)

RE: Tube ID Help - Triode_Kingdom 22:24:47 01/08/21 (1)

RE: Tube ID Help - Grinnell 08:52:09 01/09/21 (0)

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