The CRM92 is a television cathode-ray tube with a round screen giving a nine inch diagonal display. The tube diameter is 228 mm maximum.
The tube uses a triode gun and the picture should be seen through a sheet of plate glass. Implosion risk is deemed high.
In 1939 this model of picture tube was used in the Murphy V84T table top set. This CRT was also used in the 1948 Murphy V.114 table top TV that was first shown at the 1947 Radiolympia exhibition.
The tube in the original packing carton.
Sitting vertically in the box prevents any loose particles scratching the phosphor.
The outside of the cardboard carton with the original label. The serial number on the tube does not match this label and so this could be an old tube and not NOS.
Thanks to Kristina Alexander for sending the images.
On the vintage-radio.net site are pictures of a CRM92 that imploded whilst in store.
The end window envelope is 35 mm in diameter and, excluding the base pins, is 374 mm tall.
Reference: Data-sheet. Type CRM92 was first introduced in 1939. See also1939 adverts.
