Were to get fuse box for dedicated line?

Here's your source for the good ole' fuseboxes & Buss W20 ceramic edison base fuses:
http://www.renewalresources.com
You can still find ceramic W30's at the hardware store, but the W20's are now plastic. The new plastic based W20 fuses seem to sound alright, & although I've been using ceramic myself & never have done a shoot out between them, they both work much better than glass fuses which do sound harsher. Actually those fused disconnect boxes would probably work well also, but I would probably wire around (bypass) the internal switch contacts.

If your going to run a dedicated line for your audio system,don't sell yourself short-run 2 dedicated(at least)Its only more wire and it will fit in the conduit. I ran 2 dedicated lines to my system,and its one of the best tweaks you can possibly do. If you do it yourself,or get a reasonable electrician its not that expensive. Don't skimp on the outlets either. Do some research in the archives on A-gon. There is a ton of threads,and some very good information. PS-Change your electical panel to breakers. It makes life alot simpler(and probably safer)

Breakers vs. fuses are very bad advice; not at all recommended. Fuses are the superior protection device above & beyond any lousy circuit breaker.

Use of more than a single dedicated circuit is setting yourself up for possible ground hum issues, due to ground potential imbalances, & is also not recommended.

Bob, as usual, you are a great source of info. As an aside, if someone is having trouble locating ceramics (I haven't really been able to track any down up here in Canada), I'd suggest using the plastic, re-settable "mini-breaker" type fuses. I am using these (15 amp versions) and found them to be very slightly smoother than the standard plastics. I was actually expecting the opposite when I compared them, suspecting that the ability to re-set the fuse would compromise its ability compared to a standard version, but that was not the case. A 15 amp re-settable will, however, sustain short bursts of up to 17-18 amps, and, I am only guessing, but think that this may contribute to the slightly better sound quality.

The reason you're having a problem finding a load center type fuse box is because (I'm pretty sure) they're not made anymore - they're sort of like NOS, surplus only.

Where are you going to grab the power for your fuse box? If it's from the main house panel, then the feeder wire from the main panel to the fuse box has to be protected; the only way to do that is to install a new breaker for this feeder. You can't run an unprotected wire outside the panel, if you do, your fuse box becomes meaningless. If you have to use this breaker, then why not just make it a circuit instead - less devices along the power path. Either way, I would check with the local building department to cover yourself.