Solid state preamp warm up time?

If it is fused properly I'd leave it on 24/7- more so than the amp, but the amp possibly too.

Pass recommends 24 HR warm up on their preamps. They don't even have an off on switch and are designed fir continuous powerup. You mileage may vary but I have always found solid state to be best left on 24/7

I find my H-Cat ss amp needs about 30 minutes to reach its peak.

I used to leave my preamp on 24/7 unless it was tubed. My amp I left it on for the weekend if I knew I would be listening. I will say I think an amp or preamp needs 24 hrs to warm up and sound its best.

I think the first 30 minutes makes the most difference. Less for Class-As.