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

Wade Bequest collection of valves: early indirectly heated triode radio valve by Marconi-Osram with pip top and B4-3 base plus side terminal. With paper label: W67.
Wade Bequest collection of valves: early indirectly heated triode radio valve by Marconi-Osram with pip top and B4-3 base plus side terminal. With paper label: W67.