![](https://coimages.sciencemuseumgroup.org.uk/50/675/large_thumbnail_1972_0141_0248__0002_.jpg)
McVitie Weston valve collection
- Made:
- circa 1930
![Micromesh VM RF pentode valve, type 9.A](https://coimages.sciencemuseumgroup.org.uk/455/842/medium_smg00259641.jpg)
Micromesh VM RF pentode valve, type 9.A.1, B5+st base, hemispherical top, (RMW/Y316B - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.
Micromesh VM RF pentode valve, type 9.A.1, B5+st base, hemispherical top, (RMW/Y316B - McVitie Weston number), by Standard Telephones and Cables Limited, c. 1930.