![](https://coimages.sciencemuseumgroup.org.uk/63/852/large_thumbnail_1946_0107.jpg)
McVitie Weston valve collection
- Made:
- 1934-1961
![Brimar half-wave rectifier miniature valve, type R18, B9A base](https://coimages.sciencemuseumgroup.org.uk/455/814/medium_smg00259613.jpg)
Brimar half-wave rectifier miniature valve, type R18, B9A base, marked 3G4, (RMW/Y289 - McVitie Weston number), by Standard Telephones and Cables Limited, 1934-1961.
Brimar half-wave rectifier miniature valve, type R18, B9A base, marked 3G4, (RMW/Y289 - McVitie Weston number), by Standard Telephones and Cables Limited, 1934-1961.