![](https://coimages.sciencemuseumgroup.org.uk/50/736/medium_thumbnail_e2013_442_1__0001_.jpg)
McVitie Weston valve collection
- Made:
- 1923 in United States
- maker:
- Royal Ediswan
![Ediswan general-purpose triode valve, ARDE type, B4 base](https://coimages.sciencemuseumgroup.org.uk/456/531/medium_smg00263609.jpg)
Ediswan general-purpose triode valve, ARDE type, B4 base, (RMW/C85 - McVitie Weston number), by 1923.
Ediswan general-purpose triode valve, ARDE type, B4 base, (RMW/C85 - McVitie Weston number), by 1923.