Musical Fidelity A220 integrated amp

The mid range is more focused and instrument separation clearly improves. It seems much brighter when turned on and than after an hour or two sounds warmer and relaxed. I agree that leaving it on would be best, I listen when I get the urge through out the day and evening. 

It's over 20 years old and original, so I'm worried leaving it on always will retire it sooner. 

there's no right way...,I would enjoy it to it's fullest and then get it recapped if i loved it that much...

I have a 12 year old musical fidelity integrated amp which I leave on all the time. It draws 36 watts on standby. My understanding is that the capacitors, which Are most likely to fail, are stressed the most from being turned off and on as opposed to simply being left on. I can’t say I’ve noticed any difference soundwise from when I first turn it on or when I leave it on, but that’s the story at my end. 
 

That's what's concerning because the A220 doesn't seem to have a standby. It's either off or on full throttle.