McVitie Weston valve collection, Mullard valve, type PM5X
- maker:
- Mullard Limited
Mullard valve, type PM5X, marked 7B178, (RMW/D52 - McVitie Weston number), by Mullard Limited.
Mullard valve, type PM5X, marked 7B178, (RMW/D52 - McVitie Weston number), by Mullard Limited.