This valve, a dual transmitting tetrode, arrived as part of a pair, both additionally marked on the envelope as 832A, with a QQE04-20. The operating conditions given may be slightly inaccurate as exact data was not available.

The design is of the American type with two separate valves sealed into the single element. Additionally the valve is probably of American manufacture as the envelope bulge is characteristic. The oval cylinder anodes enclose the beam plates, grids and heater cathode assembly. This type of construction usually required external capacitors to neutralise parasitic oscillations. These normally being vertical wires alongside the envelope.

This valve was obsolete by the start of the 1960s replaced by the QQV03-20 or QQV06-40A varieties. It is typical of these RF power tetrodes that the base connections all match one another.

The wide glass tube envelope is 56 mm in diameter and, excluding the B7A base pins, is 52 mm tall.

 
Pin Connections

B7A	1	2	3	4	5	6	7	tc	tc
	h	g1(2)	g2	k,bp	hct	g1	h	a	a(2)

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	mAg	Pdriv	Pout	Pdiss	freq	f.max
	6.3	1.6	500	200	-65	72	14	2.6	0.18W	26	15W	200	250

This exhibit was last updated on 21 October 2008