On 1/4/2019 10:52 AM, Bob McGraw K4TAX wrote:
Mark et al:
Your description raises a bit of concern. Not with the amplifier but
with your power distribution in your home / QTH.
Yes. This is the symptom of one or more mis-wired outlets, or of an
extra bond between neutral and ground somewhere in your home. This
used to be common practice at large appliances. I would start by
buying and using a good outlet tester, which will check the wiring at
every outlet in your home.
First I'll presume you are running the amp on 120V and not 240V. Thus
being so, as the coffee maker comes on or curling iron comes on the
Neutral current changes. The fact they are on separate circuits is
one point but they thus share the same neutral. If your Neutral is
"floating" due to poor conductivity or corroded connections this will
cause distortion of the 60 Hz sine wave.
I think you mean neutral coming from the power company, not within the
home.
This distortion is always higher in frequency and is multiples of the
60 Hz signal.
There is ALWAYS significant distortion of the AC power waveform that it
is NOT the result of any sort of wiring problem. Rather, it is caused by
all the rectifier-filter power supplies in virtually every piece of
electronics in our homes and businesses. Line current flows mostly at
the positive and negative peaks of the AC cycle to recharge the filter
capacitors, resulting IR drop only during those peaks. The peaks are
rounded off, and the current is a series of pulses. There's a discussion
of this beginning with slide 55 of this talk on Power, Grounding, and
Bonding for Ham Radio. http://k9yc.com/GroundingAndAudio.pdf
73, Jim K9YC
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