![](https://coimages.sciencemuseumgroup.org.uk/50/736/medium_thumbnail_e2013_442_1__0001_.jpg)
McVitie Weston valve collection, Ramsay C.R.T. (Experimental) valve
- Made:
- 1923
![Ramsay C.R.T. (Experimental) valve, glass envelope 2](https://coimages.sciencemuseumgroup.org.uk/452/997/medium_smg00261088.jpg)
Ramsay C.R.T. (Experimental) valve, glass envelope 2.5in diam x 1ft 8in long overall, with side tube 3.5in long, marked - Tube 207A, electrode structure broken, (RMW/K23B - McVitie Weston number), by Unknown maker, 1923.