McVitie Weston valve collection, RCA Cunningham Radiotron valve, type 56
- maker:
- RCA Corporation
RCA Cunningham Radiotron valve, type 56, pinch marked S4 and moulded D, (RMW/F73 - McVitie Weston number), by RCA Corporation.
RCA Cunningham Radiotron valve, type 56, pinch marked S4 and moulded D, (RMW/F73 - McVitie Weston number), by RCA Corporation.