Wade Bequest collection of valves: DEVX triode radio valve, by Marconi-Osram
- PART OF:
- Wade Bequest collection of valves
- Made:
- England
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Wade Bequest collection of valves: DEVX small directly-heated triode radio valve, by Marconi-Osram. Early dull emitter triode with serial number 46. With B4-2 base and top seal. Paper Label: W27.
