What SS amp has the fastest warm-up time

I am as confused as Lakefront.This is like checking the gas mileage for a exotic sports car. If you don't care to spend 8 to 10 dollars a month for the electricity then you might want to think twice about dropping x to xx thousands of dollars on a amp.

Low bias amps or amps with a "special" power supply like the Sunfire's will sound the closest when going from "stone cold" to "fully warmed up". Since the Sunfire's and other similar amps are highly efficient, you would not really notice ANY increase in your electric bill if you were to leave them on all of the time. While the Sunfire might not suit your tastes, i simply selected it because it is a relatively beefy amp and is well known. Sean
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My Ayre V3 sounds great immediately from turn-on. It's a 100-watt SS amp that puts out BIG sound.

My Krell 300S seems to peak in 15-20 minutes where when I had VTL's and Atmasphere's they took at least 30 minutes.
I agree with No_money also. Pre amps and digital always sounds best after 1-3 hours and longer-good luck.

Kind of guessing why you would want to cold start an amp. If operating costs are an issue, I side with No $. If it's from an eco friendly perspective, consider that the idling provides heat. In the upper midwest we need supplement heat for approx half the year. It's slightly higher $/btu for electricity but so what. If you live in Cal, well then turn everything off to avoid brownouts and surges.

Another consideration, cold starting amps tends to be more stressful on their components. Especially for tubes.