Cosmos DE.11 general-purpose triode valve (McVitie Weston valve collection), 1924 Electronic Components 1924
Cossor Wurncell W.1 output triode valve (McVitie Weston valve collection), 1923 Electronic Components 1923
Mazda QP.240 battery double output pentode valve (McVitie Weston valve collection), 1935 Electronic Components 1935