This wonderful little oscilloscope tube caught my eye at an amateur radio 'junk sale' in the 1980s. The type designation has been rubbed off but it came with a sheet of paper wrapped round it giving its operating conditions. In use the trace is a standard green.

The a3 voltage is 800 and the a2 voltage is 192 Volts. The grid voltage is -12 Volts for beam cut-off. With these conditions 60 Volts RMS gives 40 mm Y deflection. The same 60 Volt sine wave gives 35 mm X deflection.

The neck of the tube is 32 mm in diameter and, excluding the Ct8 base pins, is 162 mm tall.

The screen is 65 mm diameter within the rubber screen protector.

 
Pin Connections

Ct8	1	2	3	4	5	6	7	8	tc
	a2	h	h	g1	X2	X1	Y2	Y1	a3

 
Absolute Maximum Operating Conditions

CRT	Vh	Ah	Va	Vg
	6.3	0.3	800	-12

This exhibit was last updated on 05 March 2005