This double beam tetrode is a Mullard design and follows the European pattern of a central common core and two spaced anodes finned for greater heat sinking.

In profile the central cathode and common screen grid can be seen as well as the two anodes at opposite sides of the cathode. The control grids are too close to the cathode to be seen in this picture.

This valve was much used for mobile VHF transmitters, as well as drivers for the larger power valves.

In keeping with the Mullard practice the heater is centre tapped to enable operation from 12.6 volts as well as the normal 6.3V, thus making them directly suitable for operation from vehicle batteries.

See also CV2798 for detailed pictures of the electrodes.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g1(1) bp	k	g1(2)	h	h	a(1)	g2	a(2)	hct

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	Pdriv	Pout	Pdiss	freq
	6.3	0.83	300	175	-40	76	3	0.5W	14	10W	225

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This exhibit was last updated on 21 January 2007