In article , harrogate3
wrote:
And to think all I did was ask about a tuner that doesn't forget when
the mains is off!


I built a 100Wpc dual-mono MOSFET power amp and wanted to switch it from
the pre-amp - at the time a Quad 33. I got a 30A solid state relay,
fitted it inside the amp, and switched it from the low voltage supply
from the pre-amp. Never had any thump or anything like.

The reason? Solid state relays only switch on at the zero crossing of
the mains, so there can never be any inrush current per se......


Oh yes there can. :-)

The first quarter cycle might still have to change the reservoir caps. Thus
can easily produce a surge. It may well be much smaller than if you'd
switched on at a mains peak, but the current at switch on may well be much
bigger than the current in normal use.

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