The QQV04-16 is a European pattern VHF double tetrode and the specification dates to 1961. The structure is miniaturized and this valve was specified for amplifier, oscillator or frequency multiplier stages at UHF. In fact full frequency rating applied to 900 MHz and an output of 7 Watts.

Unlike the classic format of these valves as is seen in QQV03/20A with vertical anodes and twin anode top caps, this valve has a very much smaller structure that is placed horizontally in the envelope.

In this case the two anode connections are taken to two base pins that fall outside the circle of pins that connect to the rest of the electrodes.

A close-up of the electrodes reveals the anodes on either side of the central cathode assembly. The common screen grid is clearly visible but the single sided control grids are too fine to be visible. The cathode is oxide coated and the heater is centre tapped so that it can operate at 6.3 Volts as well as 12.6 Volts. This is typical for the QQ family of double beam tetrodes.

The wide glass tube envelope is 44 mm in diameter, and excluding the base pins is 48 mm tall.

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	12.6	0.3	350	250	?	25.0	-	10.5

This exhibit was last updated on 02 December 2007