
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 pip top and B4-3 base.
Wade Bequest collection of valves: early directly-heated triode radio valve by Marconi-Osram. With pip top and B4-3 base.