Re: {Collins} 32S-3 power output?


As you stated, one cannot properly test a power tube on a tube tester, even
a mutual conductance one.  That is because the tester is unable to drive
the tube to peak cathode emission in order to evaluate its health in PA
service, let alone do it under high frequency conditions.   I presume you
have already tested the driver tube where the tester gives a better, though
not full, evaluation.

I suspect your final tubes are flat.

Dennis AE6C

On Thu, May 9, 2019 at 6:56 AM Grayson Evans via Collins <
collins@xxxxxxxxxxxxx> wrote:

> I am trying to solve a few problems with a round 32S-3 I am restoring.  It
> has been in storage for 12+ years so it needs a little TLC.
> One problem is drive/output power.  I don’t have a way to measure PEP, so
> I am just going on the steady state output in the LOCK KEY position through
> a power meter (calibrated) to a 50 ohm load.
> I did a detailed alignment, tweaked everything per the manual.  The
> following power reading are with everything adjusted for maximum output.
> 3.6 MHz    75 W
> 7.1 MHz    70 W
> 14.2 MHz  60 W
> 21.2 MHz    25 W
> 28 MHz     23 W
> Does this seem reasonable?  A little surprised at the dramatic drop off at
> 21MHz and above.  Has anyone else taken these measurements on a working
> 32S-3?
> I tested all tubes including the 6146’s.  They at least work, but I know
> that doesn’t tell me how well they work in the circuits in the 32S or at
> high frequencies.  I have not replaced any.
> 73, Grayson
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