Virtual Valve Museum

Virtual Valve Museum

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Size This CRT measures 470x230mm overall (205mm screen) and has a B12A base.

This is a magnetically deflected and focused CRT with an OO9 (Orange/Orange/very long persistence) aluminium backed screen.

Heater voltage 6.3V
Heater current 600mA
Max anode voltage 15.5kV
Min anode voltage 10kV
Max heater-cathode voltage 150V
Peak beam current 100µA
Typical operating conditions
Anode voltage 15kV
Grid cut-off voltage -60 to -140V
Max grid drive for 20µA beam current 29.6V
Max Cg to all other electrodes 15pF
Max Ck to all other electrodes 10pF


Pin Function Pin Function
1 Heater 7 External coating
2 Grid 8 no pin
3 no pin 9 no pin
4 no pin 10 i/c
5 no pin 11 Cathode
6 Internal coating 12 Heater
Side cap Anode

The external coating, pin 7, should be connected at or near cathode potential. The inclusion of this coating is not compulsory, but it may be provided at the discretion of the manufacturer.