![](https://coimages.sciencemuseumgroup.org.uk/58/890/large_thumbnail_1991_0166.jpg)
McVitie Weston valve collection, Tungsram valve, type APP4100
- Made:
- 1949
![SMG00257811](https://coimages.sciencemuseumgroup.org.uk/491/697/medium_smg00257811.jpg)
Tungsram valve, type APP4100, marked 092, (RMW/Y179 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd..-1949
Tungsram valve, type APP4100, marked 092, (RMW/Y179 - McVitie Weston number), by Tungsram Electric Lamp Works (Gt. Britain) Ltd..-1949