As you see I am a total "goner" living in a cheap apartment with about 50 grand in Audiophile equipment. I am looking at purchasing an old krell "FPB 400 CX" amp that the manufacturer says needs a dedicated 20 amp line. Can you still run this amp off a regular electrical outlet? If you can, will it sound like crap?
Sorry man, your question is simple enough. Instead of saying we don't even know where to start they are advising you on where to live and rebuilding your whole system. Almost all of it total malarkey. Oh well.
Yes. Of course you can. No problem.
Will it sound like crap? Well in the big scheme of things no. Keeping in mind you are in an apartment, RFI and power problems galore, then the whole 15 amps/20 amps thing pales in comparison.
Only possible small problem, one of the few relevant comments above, there may be some small chance that depending on what all else is on that circuit, that if it all happens to be running at the same time AND you happen to turn the Krell on at that time, then MAYBE you trip the breaker. Not likely but in an apartment situation who knows how they wired it or what else you might have running. Anyway, point is, that is the worst that can happen.
In which case you turn something off, flip the breaker, try again. In spite of what people assume the greatest power draw is not playing music loud but when filling the power supply caps from empty to full which only happens right at turn-on.
Now about that cabin. You want a waterfall nearby. For the hydro....