![](https://coimages.sciencemuseumgroup.org.uk/50/675/large_thumbnail_1972_0141_0248__0002_.jpg)
McVitie Weston valve collection
- Made:
- circa 1930
![Micromesh output triode valve, type PA1, B4 base](https://coimages.sciencemuseumgroup.org.uk/455/893/medium_smg00259692.jpg)
Micromesh output triode valve, type PA1, B4 base, pinch marked 3, central pin clipped, (RMW/Y364B - McVitie Weston number), by Standard Telephones and Cables Limited, c.1930.
Micromesh output triode valve, type PA1, B4 base, pinch marked 3, central pin clipped, (RMW/Y364B - McVitie Weston number), by Standard Telephones and Cables Limited, c.1930.