Wade Bequest collection of valves: Catkin triode radio valve, by Marconi-Osram
- PART OF:
- Wade Bequest collection of valves
- Made:
- England, Germany and United States
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Wade Bequest collection of valves: Catkin indirectly-heated triode radio valve, by Marconi-Osram. With B5 base and external copper anode. Paper label: W58.
