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


I recently acquired an integrated Mcintosh MA-352 amp with stock 2 AX7 TUBES as well as 2 AT7 TUBES in the preamplifier section. I would like to improve the performance of the amp by changing the tubes to either Mullard, Tungsol, RCA  or Valvo.

Do you have any suggestions to go in the direction of sweetness and musicality?

Thank you all.

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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.

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

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

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