Hi Mal the QZ06-40 is not in my 1969 book ...I wonder whether that is a
QQxxx the double tetrode. As far as I can see the "Z" version is a quick
heat heater for "mobile" applications. I think the heater fired up off about
2 volts from an overwind on an inverter (in Pye kit at least) and was up to
working temp in a few seconds. Thus it was not necessary to run the valve
heater continuously, and flatten the battery. I seem to remember QQZ06-20As
(or were they -40As)in 30Watt Pye W30 Westminster long-case boot mount
mobile. I think a lot of the valves I came across had gold plated pins too.
Cheers de Alan G3NYK
[email protected]
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