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Wade Bequest collection of valves: early R-type triode radio valve
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Wade Bequest collection of valves: early R-type triode radio valve. Spherical bulb with B4-1 ceramic base and top seal.. Marked S375-37. With paper label: W59.
Wade Bequest collection of valves: early R-type triode radio valve. Spherical bulb with B4-1 ceramic base and top seal.. Marked S375-37. With paper label: W59.