![](https://coimages.sciencemuseumgroup.org.uk/63/852/large_thumbnail_1946_0107.jpg)
McVitie Weston valve collection
- Made:
- United States and Canada
- maker:
- RCA Corporation and E T Cunningham, Inc
![RCA general-purpose triode valve, Radiotron type 27, USS5 base](https://coimages.sciencemuseumgroup.org.uk/455/971/medium_smg00259771.jpg)
RCA general-purpose triode valve, Radiotron type 27, USS5 base, marked F615 pinch marked 011, (RMW/F66 - McVitie Weston number), by RCA Corporation and E.T. Cunningham.