This STC 19G/12 (CV1111) was used in the EHT supply for the 'Baby' Computer at Manchester Museum of Science and Industry. Properly this was the Small-Scale Experimental Machine, known as SSEM.
This valve failed and when tapped sparks appeared around the filament.
![](../vox/vox003a.jpg)
![](../vox/vox003b.jpg)
The label from the end of the box clearly shows that the STC Type 19G/12 is identical to the CV1111.
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