Wade Bequest collection of valves: experimental Catkin triode radio valve by Marconi-Osram
- PART OF:
- Wade Bequest collection of valves
- Made:
- England
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Wade Bequest collection of valves: experimental indirectly-heated Catkin triode radio valve by Marconi-Osram. With external flat-plate anode and B-5 base. With paper label: W56.
