Best Amp for McIntosh sys.- MC252, MC402, or MC501

Another vote for 501's - amps you will most likely keep for many years. 402's are great amps but the 501's are a big step up, they were in my system. They were more effortless as mentioned above several times on my Thiels, a rather difficult load.

If affordable to you, you'll want to choose from the McIntosh amps that have the quad-differential circuit. In power amps, that's MC402 and up through the top of the line. Nothing wrong with the MC252, but it's not quad-differential and not quite in the same league. The difference is quite noticeable, IMO.

Once you decide to choose from the quad-diff range, then the improvements get more subtle. Generally 501s are worth the increased cost over a 402, but a 602 is probably the performance-per-dollar peak. The big jump is going to the MC1201 or MC1.2K. You may not need the power, but there's something happening in that Mac circuit at and past the kilowatt range than pushes the speaker crossover out of the way, boosts transparency and introduces a general effortlessness to music that you didn't know you could gain until you hear it.

Phil

Theo, the MC352 is also a "dual differential" amp - I believe it was the first Mac amp with this type of circuit. The MC252 has a more conventional driver circuit.

BTW, I got away from changing bulbs in my MC352 by purchasing the LED kit that Audio Classics sells. A lot cheaper than a new amp. But if you like the sound of the MC402 better than your old MC352, you made the right choice.

Decided to get the MC 501's along with the C46 Pre-amp. Entdoc was exactly correct in describing "the sound seems to come from everywhere", the speakers just seem to disappear even at low volume.