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Just the opposite

I very recently had my Acoustat servo amps rebuilt and the high-voltage trannies were replaced with larger uprated transformers. Much to my chagrin, when I got them home and plugged them in, the transformers hummed and buzzed to the point of being an annoyance. Clearly audible from the listening position during quiet passages in music. I tried tightening up screws and all the obvious stuff. After a week or two, it finally struck me that it might have something to do with line voltage. The high-voltage transformers are custom wound and it occurred to me actually look at the stickers on them the manufacturer had affixed to them. Right there in black and white it said they were 115v input. Well, my PurePower re-generator was set to output 120v/60hz. I dug out the manual and read up on how to change it, which I did and set it to output 115v/60hz. Immediately the buzzing and humming went almost entirely away. No longer an annoyance. One of the four transformers still buzzes a little, but no big deal to me. According to the display on the PurePower unit, line voltage from the wall usually runs at around 125v.

Edit: Sorry, your post was about frequency and not voltage. I should've read more closely before reply. Although, now you've got me wondering about playing with different frequency settings on the PurePower.


Edits: 03/24/16
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