McVitie Weston valve collection, De Forest valve, type DV5
- maker:
- Lee De
De Forest valve, type DV5, marked 10027, orange test label, (RMW/D126 - McVitie Weston number), by De Forest, Lee.
De Forest valve, type DV5, marked 10027, orange test label, (RMW/D126 - McVitie Weston number), by De Forest, Lee.