![](https://coimages.sciencemuseumgroup.org.uk/52/717/large_thumbnail_1922_0732__0001_.jpg)
McVitie Weston valve collection
- maker:
- Royal Ediswan
![Ediswan general-purpose triode, type AR, B4 base, marked 645](https://coimages.sciencemuseumgroup.org.uk/453/527/medium_smg00262916.jpg)
Ediswan general-purpose triode, type AR, B4 base, marked 645, (RMW/B129A - McVitie Weston number), by Royal Ediswan.
Ediswan general-purpose triode, type AR, B4 base, marked 645, (RMW/B129A - McVitie Weston number), by Royal Ediswan.