G'day
For anyone who has a physical audible vibration-type hum from a Ten Tec 255
power supply, I have found a solution which works like a charm. Running
the supply from 230V/50Hz (like me) means that this problem is worse than
when using 110V/60Hz.
I cured it by making four stand-off washers, each from four (folds)
thicknesses of an old bicycle innner tube, and putting them between the
transformer and its screws - it is almost totally quiet now! The damping
is huge - you could put your hand on top of the transformer and feel it
very vibrate very strongly - now there is virtually nothing.
Vy 73
Steve, VK6VZ
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