Step Up from a Sunfire

What is recommended in regards to being on all the time ? No on off switch 

I only plug mine the morning I know I will use it that night or for the weekend.   Otherwise it's unplugged.  Lightning storms, electrical current bursts, brown outs, etc not good.
 It's fine, don't worry.  Plug in when you want to use it, but there is a good 2 hour warm up I have noticed, it will sound tighter and just more at ease when warm. 

I leave my 300 turned on 24/7 (with surge protection). It does take a couple hours to reach it’s optimal performance after a cold start. Bob Carver has written that it can be left turned on and that constant voltage to the unit will not hurt. (not a good idea if your AC is unstable, IMO).
Plus, I don’t like the idea of an in-rush of current every day when it’s being powered up.

I too have had my amp refurbished by Bill Flannery. I have a 300 first generation, and he upgraded it to meet the specs of the Sunfire 300-two (3rd generation). It now has a much lower noise-floor.

In my situation the sunfire sound is effortless . From low , med to high volume it does not change it’s presentation . No nasties in any frequencies . Smooth sounding .

@maplegrovemusic, that says it all. I can only add that the Sunfire "house sound" is lush, warm, with wide and deep soundstaging. It’s very "non-solid state" sounding.