Wade Bequest collection of valves: S625 radio valve, by Marconi-Osram
Wade Bequest collection of valves: S625 radio valve, by Marconi-Osram. Early screen grid tetrode with two end caps, one with three pins and the other with two pins. Paper label: W10.
- Collection Unassigned
- Object Number:
- Wade, J.C.F.
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