Does anybody have a Philips tube manual? If so, can you please look up the
following tubes?
QY4-250B
QB3.5/750
Our club has been using them in a couple of GG field day amps for years and
we were wondering what they were equivalent to.
We get around a gallon into a dummy load on a sunny day with them or more
precisely, 400W pep into the antenna as is the law in this country.
They are both tetrodes and look like 4-250/4-400 etc with flat graphite
anodes. (not ribbed graphite anodes like the 3-500ZG's)
Would just like to know their plate dissipation, Va max, filament current etc.
Thanks for any help you may be able to give,
Alek. VK6APK
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