
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram

Wade Bequest collection of valves: early directly-heated triode radio valve by Marconi-Osram. With B4-3 base and top seal. With phosphorous getter. With papel label: W65.
Wade Bequest collection of valves: early directly-heated triode radio valve by Marconi-Osram. With B4-3 base and top seal. With phosphorous getter. With papel label: W65.