McVitie Weston valve collection, Mullard valve, type HL20
- maker:
- Mullard Limited
Mullard valve, type HL20, copper metallising partially removed, glass envelope loose, (RMW/F51 - McVitie Weston number), by Mullard Limited.
Mullard valve, type HL20, copper metallising partially removed, glass envelope loose, (RMW/F51 - McVitie Weston number), by Mullard Limited.