Zero hum from mine. From other comments, be sure the power transformer
is correctly installed and secured. It may have moved during
transportation if you purchased a factory built unit.
As to 20 watts drive and 350 watts out, what bands? With 20 watts
drive from my K3S I see 450 to 550 watts out on all bands as seen on the
amp LED indication and on an external {Bird 43} meter. The HV is 62
volts and the current is 11.5 amps into a dummy load. Amp is operated
from a 240 source.
73
Bob, K4TAX
On 11/6/2018 10:47 PM, Macy monkeys wrote:
I'm certainly having my troubles with this new KPA500. The level of hum is
unacceptable.
The manual says it is normal to hear hum. With 20 w drive I'm getting 350 watts
out but the hum is horrendous when I send CW. SSB not so bad. Is this level of
hum normal during keydown? It's room filling!
John K7FD
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