This exhibit is a CV320 CRT. The original buff paper label has been lost but the CRT arrived in an labelled paper bag. The device is a E4103/B/4 GEC experimental tube. The face is sensibly flat for 30 mm diameter.

Both anodes are connected together and need 1,000 Volts on them. With 1,000 Volts on the anodes the Y sensitivity is 0.09 mm/V and the X sensitivity is 0.1 mm/V. The grid voltage of -25 Volts is to achieve cut-off.

The detail picture shows the electron gun and Y deflection plates. The precision nature of the assembly is clear. This is why for television the easier to manufacture magnetically deflected tubes were chosen and developed.

The screen has a green trace.

The standard B9 base employs split pins for good contact with the socket.

Thanks to Patrick Atkin for spotting this CRT at a boot fair and donating it to the museum.

The end window envelope is 38 mm in diameter, and excluding the B9 base pins, is 138 mm tall.

 
Pin Connections

B9	1	2	3	4	5	6	7	8	9
	x1	y1	a2	h,k	h	g1	a1,a3	y2	x2

 
Absolute Maximum Operating Conditions

CRT	Vh	Ah	Va	Vg
	4.0	1.1	1,000	-25

This exhibit was last updated on 11 October 2008