ard at p850ug1.demon.co.uk
Mon Jul 19 15:27:48 CDT 2010
> Tony Duell wrote:
> > Certainly for testing. RRun the heaters off a battery. If the hum goes
> > away, at least you know where it's coming from.
> I found my hum ... Poor magnetic shielding between the power supply
> and the pre-amp output transformers. Not much I can do unless I can
I am curious as t owhy toy have output transformers in a pre-amp, but
Have you treid moving them around. If they're of the normal clamp
construciton, arranging the cores in a straight line is about the wrst
thing you can do. Turning the mains transofrmer through 90 degress might
> order custom shielded chokes and power transformers as well as
> shielded 10K to 600 ohm output transformers.
Make your own screens?
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