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Hi All
Surprisingly, most high power amps do not have a
SOFT START, and judging by the thump at times on switch on, it is even more
surprising that the power supply does not explode. In recent times I use a
variac and gradually adjust it to full voltages.
This is overkill and a more simple cct would
suffice. I lost one mains transformer a few years ago and the replacement
cost more than the amp was worth. Some of the PSU'S for low voltage high
current FET AMPS used in LF applications are even more vunerable ie 12 -
24 V at 20 - 100 A. Most Amateurs that I have spoken to do not realize
the danger involved. One of the bean can size electrolytics 200
mfd capacity exploding would be like firing a mortar, probably demolish the
house in some cases. The stone built country house would probably survive.If you
are dabbling with QRP there is no need to worry.
73 de Mal/G3KEV
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