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MH4, MARCONI OSRAM, TRIODE, WARTIME PRODUCTION, 1MTL, AC/HL, AR17, CV399, CV1037, D4, HL4, MH4K, NR31, VR37
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MH4, MARCONI OSRAM, TRIODE, WARTIME PRODUCTION, 1MTL, AC/HL, AR17, CV399, CV1037, D4, HL4, MH4K, NR31, VR37

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MH4, MARCONI OSRAM, TRIODE,  WARTIME PRODUCTION, 1MTL, AC/HL, AR17, CV399, CV1037, D4, HL4, MH4K, NR31, VR37

Beautiful screeded broad ST19 bulb, black base, today we have a Marconi Osram MH4 with an elliptical bicolour Osram decal to the obverse.   The device has been tested using our VCM163 valve tester and shows good emission.

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