![](https://coimages.sciencemuseumgroup.org.uk/50/736/medium_thumbnail_e2013_442_1__0001_.jpg)
McVitie Weston valve collection
- Made:
- 1924 in United States
- maker:
- Osram
![Marconi output triode valve, type D.E.5](https://coimages.sciencemuseumgroup.org.uk/453/572/medium_smg00262961.jpg)
Marconi output triode valve, type D.E.5., B4 base, (RMW/C33 - McVitie Weston number), by Osram, 1924.
Marconi output triode valve, type D.E.5., B4 base, (RMW/C33 - McVitie Weston number), by Osram, 1924.