radio component; tuner manufactured by Marconi Wireless Telegraph Co Ltd Marconi Wireless Telegraph Co tuner
Board supporting two Ayrton-Mather non-induction spiral coils Board supporting two Ayrton-Mather non-induction spiral coils
thermionic valve - valve,triode made by Marconi Osram Valve Co, in England, United Kingdom, 1924 thermionic valve - valve
A collection of four electrical valves; large from the early period (triodes, rectifiers). These are Type GAT9 (water cooled triode), CV19 (rectifier), ACT9 (rectifier), V1505 (triode). Mostly large size, one with black cooling grid on it. valve