![](https://coimages.sciencemuseumgroup.org.uk/50/675/large_thumbnail_1972_0141_0248__0002_.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base
- PART OF:
- Wade Bequest collection of valves
- Made:
- 1917 in England, Germany and United States
![SMG00237677](https://coimages.sciencemuseumgroup.org.uk/448/638/medium_smg00237677.jpg)
Wade Bequest collection of valves: Small R-type triode radio valve without base. With spherical bulb and top seal. With paper label: 1917.