McVitie Weston valve collection, Ediswan valve, type experimental diode
Ediswan valve, type experimental diode, base marked ES, (RMW/A94 - McVitie Weston number), by Royal Ediswan.
Ediswan valve, type experimental diode, base marked ES, (RMW/A94 - McVitie Weston number), by Royal Ediswan.