I just finished tearing down and rebuilding a HV/LV supply for a Globe King
500A. Galvanized the chassis and repainted all the xfmrs. Looks great,
works great BUT the supply is buzzing quite loudly. I know it is coming
from the HV supply on this deck. LV supply quiet. The buzz is there when I
turn on the HV supply switch and become quite a bit louder when I load the
HV supply down (loading and running the transmitter section).
Any thoughts of what might cause this noise. I don't think its any kind of
arcing but a mechanical noise and probably around 60 cycles...maybe. It is
low pitched. This supply using a filament xfmr for the 866A retifiers, a
350 ma choke and large High voltage transformer. I know I have to isolate
the noise to one of the xfmrs but then what do I do? Any help/thoughts
would be appreciated.
Thanks much. Van, K7VS
PS. Next step is to clean off the modulator deck, remove all the rust and
rebuild it. The RF is pretty clean but doing the same to it. I fired up
the transmitter section today and got 300+ watts into a dummy load thru bird
wattmeter. Pretty good for an old boy that probably hasn't been on the air
for thirty or forty years with a very rusty modulation section and very
rusty power supply deck that now looks like it just came out of the factory!
HI HI.
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