How many fuses in a McIntosh MC275?

No, they are OK. Actually, I had an upgraded fuse (the main, external fuse), and it was taken out by a defective tube. You might have seen my thread a while back. Replaced the tube and used a generic fuse and all is working ok.

Now I'm in the process of getting a quad of new tubes, replace the fuse that went, and thought it was the right time to consider upgrading other fuses, should there be any more, should they make a difference, and should it not require disassembling the whole amp to do so.

Can you elaborate on you first post, dude?

WOW No way! Fuses are usually visible and sometimes resistors are set to work as a fuse. Upgrading or replacing fuses is the most ridiculous upgrade you'll ever get.

I see...fuses are a ridiculous upgrade to you. Yet I heard improvements every time I upgraded from a std fuse to an audiophile fuse.

Why do you waist time trying to convince me of something I did not even ask about? You are surely waisting my time trying to honestly understand if you had something to say...oh well...

Thanks

Are you sure it is a 200mA? From what I see in the service menu, the main power fuse is 250V 4A slow-blow and two more inside for speakers output are 250V 2A slow-blow. You can download a service menu from here.

you can only prove hearing improvements on the blind a/b tests. blind tests is where all audi'o'philes fail to ID stock fuse from aftermarket and other silly unnecessary stuff.
as you know, fuses tend to blow and usually are all visible on the pcb or direct wiring. the improvement you've heard is possibly from the quality of the contact so all you need to do is to clean fuse terminals with qtip and contact cleaner.