Over the last year or two on my Quads 2805's and my friends 2905's I have heard in very controlled settings:
Audio Research VT 200 Mk III,
Quicksilver V4's,
2 Atmasphere Amps, (30 watt current model, and 140
watt prior model)
Quicksilver V4's
Convergent
Krell KSA Series Amp
Quad 80's,
Estoeric A-100,
Tom Evans Linear B's
My favorites in order:
1. Estoeric A-100 (My favorite by a mile)
2. Convergent
3. Tom Evans Linear B's
4. Quad Eighty Mono's
Of the amps you started the thread with I can not see any of them being the "last amp you may ever buy" they leave to much performance to be desired when matched to Quads, for my taste. Now I am not suggesting you must spend $18,000 dollars to be happy, many lower cost alternatives are good.
I like the Vac alternative that was suggested, performance wise. I used to own a Vac Phi 300, and it is a great sounding amp, with the Martin Logan Summits I owned at the time, but I have not heard the Vac Phi, with my Quads. Nonetheless, I do it expect it would be a very good match, I was moving towards going back to Vac, when I discovered the Esoteric, which is end game for me.
Sorry to ramble, good luck!
Audio Research VT 200 Mk III,
Quicksilver V4's,
2 Atmasphere Amps, (30 watt current model, and 140
watt prior model)
Quicksilver V4's
Convergent
Krell KSA Series Amp
Quad 80's,
Estoeric A-100,
Tom Evans Linear B's
My favorites in order:
1. Estoeric A-100 (My favorite by a mile)
2. Convergent
3. Tom Evans Linear B's
4. Quad Eighty Mono's
Of the amps you started the thread with I can not see any of them being the "last amp you may ever buy" they leave to much performance to be desired when matched to Quads, for my taste. Now I am not suggesting you must spend $18,000 dollars to be happy, many lower cost alternatives are good.
I like the Vac alternative that was suggested, performance wise. I used to own a Vac Phi 300, and it is a great sounding amp, with the Martin Logan Summits I owned at the time, but I have not heard the Vac Phi, with my Quads. Nonetheless, I do it expect it would be a very good match, I was moving towards going back to Vac, when I discovered the Esoteric, which is end game for me.
Sorry to ramble, good luck!