The Cossor 61BT is a beam tetrode for television line scan output. This valve would have been used in post war monochrome VHF television receivers.

The cathode bias resistor would have been of the order of 470 Ohms and the positive surge on the anode could reach 5,000 Volts. The anode dissipation was limited to 8 Watts and the screen to 1.75 Watts.

The classic envelope is 30 mm in diameter and, excluding the IO base pins, is 87 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	-	h	-	g2	g1	-	h	k	a

 
Absolute Maximum Operating Conditions

Beam Tetrode	Vh	Ah	Va	Vs	Vg
	6.3	0.7	200	200	-1

This exhibit was last updated on 07 August 2005