Best integrated amp for 10K


Currently changing system to match new Quad electrostatics. Looking at tube amp/preamps to match with Quads, but concerned over limited space in home theatre cabinet. Heard great things about VAC Sigma 160i and Ayon Audio Triton III integrated amps as being fabulous for the money. Budget around $10k. Any thoughts from people with these 2 units as to matching with the Quads? Any other options?
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Also, how important is having Class A vs. Class AB. Obviously there is no crossover distortion with Class A, so how do VAC and others get around this with such success?
Does this give units like the Ayon Triton III and Luxman L-590AX a theoretical advantage from the start?
Two other terrific integrateds you could consider if you're prepared to stretch would be a Simaudio 700i & Boulder 865 @ around 12k.

In regard to Class A vs Class AB integrated amps, solid state Class A integrateds won't have enough power to drive your Quads, so it's not really worth discussing. Class A/B amps can sound linear and very good if there are a good number of watts in Class A & the designer was successful in notching out any audible crossover distortion. I know that Boulder go to great efforts to notch out crossover distortion & their measured linearity suggests that is so. Edgar Kramer reviewed the 865 for AVHub including a comprehensive lab report which is worth a read.

Ayon Audio build their top ranging gear in Austria which is terrific (eg: CD-2s, CD-5s), however the Triton (and lower range gear) are made in thier factory in Hong Kong with Taiwanese-assembled boards. Have a look at these two links which confirm this -

(Preamble: If the US Ayon Distributor is trolling AG for negative commentary on Ayon components as usual. Don't shoot the messenger. I did NOT write these reviews)..
http://www.highfidelity.pl/@main-212&lang=en
http://highfidelity.pl/@main-215&lang=en

Have you considered the matching Quad Classic II? I believe it falls below you budget
The cult following for ESL's and Atma-sphere is very simple.. ESL's draw a tremendous amount of current on the high frequencies and very little on the lows ( this is the exact opposite of a conventional loud speaker ) Atma-sphere excells with this type of load! Sorry for the quick response I have to pick up my 3 year old!

Cheers!

P.S Call Ralph at Atma-Sphere he can explain it better!