After reading an article about building an amplifier which used ten
1625's
with paralleled RF but with series filaments directly across the
120-volt
line, I've been saving them; hope to find the right round tuit
someday....
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Considering that with so many valves (tubes) in parallel operation the
inter-electrode capacitance is multipled accordingly, it would be
intriguing
to know up to which frequency this set-up could be sensibly used.


I have seen a CB amp using as many as 12 of the 1625 tubes. There were 6 in
parallel on each side of a push pull circuit. Not sure how clean the output
was but they seemed efficiant enough to give about 300 to 500 watts out of
carrier power and the modulation sounded good.