McVitie Weston valve collection, Mullard valve, type S.W.50
- maker:
- Mullard Limited
Mullard valve, type S.W.50, marked 31, double-ended triode, 12in overall, (RMW/J113 - McVitie Weston number), by Mullard Limited.
Mullard valve, type S.W.50, marked 31, double-ended triode, 12in overall, (RMW/J113 - McVitie Weston number), by Mullard Limited.