I once owned a pair of SS monoblock amps that had transformers that would
buzz quite loudly in unison. They would never buzz at the same time of day,
nor would they buzz every day. But, buzz they did.
The manufacturer told me it was not the fault of the amps, and that it was
the fault of my home AC. I had the power company monitor my power for
four weeks, and they said everything was within specifications (I did explain
the problem and that I used high end audio amplifiers). I installed a
commercial grade power filter at my service panel that the filter's
manufacturer said would correct the problem. It didn't.
No other amplifier has had transformers that buzz in my system.
There is probably something with my power that the buzzing amps did not
like, but on the other hand there was something in their build/design that
was uniquely sensitive to the power in my home that caused the transformers
to buzz when transformers in all other amps I have owned or auditioned have
been dead quiet.
So, the moral of the story is that the manufacturer said it was the fault of my
home AC, and I thought it was the fault of the amplifiers. The truth lies
somewhere between...which goes to your point about variables in our
individual home's AC power delivery and why audiophile power filters
sometimes produce quite different results in our systems.
IMO
buzz quite loudly in unison. They would never buzz at the same time of day,
nor would they buzz every day. But, buzz they did.
The manufacturer told me it was not the fault of the amps, and that it was
the fault of my home AC. I had the power company monitor my power for
four weeks, and they said everything was within specifications (I did explain
the problem and that I used high end audio amplifiers). I installed a
commercial grade power filter at my service panel that the filter's
manufacturer said would correct the problem. It didn't.
No other amplifier has had transformers that buzz in my system.
There is probably something with my power that the buzzing amps did not
like, but on the other hand there was something in their build/design that
was uniquely sensitive to the power in my home that caused the transformers
to buzz when transformers in all other amps I have owned or auditioned have
been dead quiet.
So, the moral of the story is that the manufacturer said it was the fault of my
home AC, and I thought it was the fault of the amplifiers. The truth lies
somewhere between...which goes to your point about variables in our
individual home's AC power delivery and why audiophile power filters
sometimes produce quite different results in our systems.
IMO