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.
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.