McVitie Weston valve collection, Marconi valve, type D.E.T.1
- maker:
- Marconi Company Limited
Marconi valve, type D.E.T.1, marked 2793S, pinch marked 1528, square black moulded 4-pin MOV base, filament broken, (RMW/J34 - McVitie Weston number), by Marconi Company Limited.