McVitie Weston valve collection, Marconi valve, type D.E.T.1
- maker:
- Marconi Company Limited
Marconi valve, type D.E.T.1, marked 4633N, pinch marked 8467, glass loose, filament broken, (RMW/J35 - McVitie Weston number), by Marconi Company Limited.
Marconi valve, type D.E.T.1, marked 4633N, pinch marked 8467, glass loose, filament broken, (RMW/J35 - McVitie Weston number), by Marconi Company Limited.