McVitie Weston valve collection, STC valve, type 4036A
- Made:
- 1931
STC valve, type 4036A, pinch marked AX6, grid and filament broken, (RMW/J143B - McVitie Weston number), by Standard Telephones and Cables Limited, 1931.
STC valve, type 4036A, pinch marked AX6, grid and filament broken, (RMW/J143B - McVitie Weston number), by Standard Telephones and Cables Limited, 1931.