McVitie Weston valve collection, Tungsram valve, type H210
Tungsram valve, type H210, oblique electrode system, (RMW/E63 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd..
Tungsram valve, type H210, oblique electrode system, (RMW/E63 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd..