Lamm ML2 - ML2.1

I definitely preferred the ML2 to the later model.
I don't know the circuit differences -- but there must be some...

Listening was through horns. (BTW, horns were the only available spkrs; I am not saying you MUST use horns.)

I remember that mid-highs were better in particular, and that the musical presentation overall gave a better impression with the 2. BTW, various sources say that both amps use up the driver stage tubes quite fast (but they're cheap to buy). Cheers

I own and love the ML 2.1's. IMO and for "my" ears it is the best amp I have ever owned and I have owned many top end amps.

At 18 wpc, they provide plenty of headroom to drive my Wilson X-2's. I doubt if I will ever buy another amp.

I own a pair of the later ML2's which have the brass binding posts. I have not heard the ML2.1 but really like my ML2's. I think the main difference is supposed to be that they had to find a new source for the custom made transformers as they were having delivery issues with the original source. I believe the new source used the same basic specs but the transformers may sound slightly different. I really doubt you can go wrong with either, I have had no maintanence issues with my ML2's since I have had them.