Wade Bequest collection of valves
Wade Bequest collection of valves
Wade Bequest collection of valves: early triode radio valve
Wade Bequest collection of valves: full-wave rectifer radio valve
Wade Bequest collection of valves: early triode radio valve
Wade Bequest collection of valves: Early triode valve by Marconi-Osram
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram, 1926
1926
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram
Wade Bequest collection of valves: triode radio valve
Wade Bequest collection of valves: full-wave recitifier radio valve
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: radio valve without base
Wade Bequest collection of valves: World War One German triode radio valve
1916
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: experimental triode radio valve by Marconi-Osram
1915
Wade Bequest collection of valves: early tetrode radio valve by Marconi-Osram
1916
Wade Bequest collection of valves: pentode radio valve
Wade Bequest collection of valves: experimental Catkin triode radio valve by Marconi-Osram
Wade Bequest collection of valves: four-electrode radio valve by Marconi-Osram
1920
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: early four-electrode radio valve by Marconi-Osram. With B4-3 base
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
Wade Bequest collection of valves: early triode radio valve by Marconi-Osram
