McVitie Weston valve collection, Experimental Electron beam indicator lamp valve
Experimental Electron beam indicator lamp valve, 5-pin black moulded base, (RMW/K12B - McVitie Weston number), by Unknown maker.
Experimental Electron beam indicator lamp valve, 5-pin black moulded base, (RMW/K12B - McVitie Weston number), by Unknown maker.