[TenTec] Cure to physical hum on Ten Tec 255 supply

[Steve Ireland]

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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