GEC Small Cathode Ray Tube (CRT)

Ref. M7

This Cathode Ray tube, made in England by G.E.C. (General Electric Company), is about 14 cm long and 3 cm diameter, and probably dates back to the fifties of the 20^th century. It was removed in the eighties from an old audiometer.

It has a medium persistence green phosphor output screen.

No other specifications or type number are available.