Use a regular switch and an LM555 timer controlling an AC relay, for adding time delay for the amp.
The LM555 should immediately reset upon power off, to deal with AC power line drop outs.
All you really need, though, is delayed unmuting on the preamp outputs. Then both preamp
and amp can be safely switched on at the same time. The LM555 should immediately reset
upon power off, to deal with AC power line drop outs.
What kind of amp/preamp is this for?
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It's a China JC-2 clone? I have one of those. I think the arrangement in post 4 would work for you,
just add the circuit in an external box.
You can add a pass-through box with a series resistor and a shunt relay to ground, controlled by
the LM555. This box would need its own power supply. The timer should reset immediately upon
turnoff, to deal with AC line dropouts.
You would plug the box's power cord into a switched AC outlet on the preamp, so the box can sense
that the preamp power has been switched. Or if you use an outlet strip to switch everything, plug
the box into that.
There are commercial AC sequencing boxes made for this kind of purpose, Audio Research made some
rather expensive ones years ago.
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