For an integrated Mcintosh MA-352 amp, CHOICE OF TUBES

You will discover that for the MCD 600 player, the fuse is inside the device; short slow blow 2 amp (Ceramic)

For the MA 352 amp I am not sure of the existence of a second fuse inside the device.

It would be interesting if a resourceful man could confirm it to us

Yoby, i only changed the main fuse. To be honest I was not aware there were more fuses in the 352.

For my part, this is what I planned to do before opting for a change of tubes. I made my choice on the Acme Audio Labs Silver Ceramic Fuse Cryogenic Treated with CFC 8 amp, small slow blow for the amp and my integrated player the MCD 600 which requires a 2-amp fuse of the same type.When I started this discussion I had not received my Mac player. I must say that since then it has changed the sound to a warmer sound so my choice of tubes will possibly go in another direction, to follow

@dwest1023 : Did you upgrade all of the fuses in your MA-352, or just the main one? Thanks and good listening. Jeff

Very knowledgeable. https://dougstubes.com/

I also own and Mac 352 and I find that the stock tubes sound best in my setup. I tried mullards{new stock} and found they did not sound as good to my ears as shock. There was more and stronger bass, but sounded congested compared to stock. It could had been I did not give the tubes enough break in time. I did get a noticeable good difference by changeing the fuse to a synagentic purple fuse. I prefer a more relaxed sound.

I have the MA-12000 and am interested in any responses.  I never considered changing out tubes, but this just might be a good idea.