Pure Class-A Amp under $2000 (USED)

whatever you do, steer clear of that Emoteva tripe.

gain is ultra high, you will have tweeter hiss

plus the service on them is a disgrace to audio.

they are ok for what they are entry level stereo separates .

nothing more.  i did hear the new flagship speaker was fairly descent, despite the very low Watts/current allowed. for such a good size speaker, i think its only 250W

i do like the folded horn tweeter if the source material is well recorded.

heavy metal through the Emo amps was painful, they are bright, even with a 92 1w/1m pair of old speakers i had 15+ years ago.

they were ok for country, or reg rock, but metal,...aaaarrrgggghhhhh shrill, i even switched speakers, and still shrill and molar grinding.

had the xpa-1 monos.  big bulky, and those knight rider like blue meters on the front were making the amp look cheap and low end. as it is. i had them shut off from first warmup.

if you know about class A, im sure you know about that Emo mess

KRELL KSA 50 or KSA 100, both fantastically musical amps, and when funds permit an Audio Research pre an SP9 or LS2B.

I know they are old uns but are good uns, maybe not as detailed as later models but more engaging and less Hifi sounding.

Have any one try the Krell KSA50S, it's about $1500 in my country including the shipping.

FWIW...there is a First Watt M2 available right now for $1850. It will work well with 6-ohm speakers. Your sensitivity at 88dB is lower than I would like but you will get decent sound as long as you don't expect to rock the house. I have an F6 controlled by an NAD C658 connected to Focal Kanta No.2 speakers rated at 91dB efficiency and frankly they sound great and can put out enough volume to drive the wife out but I like MORE so I just ordered a set of Tekton DI's rated at 98dB efficiency. 

My 2 cents

Used First Watt M2 for Sale | HifiShark.com

+1 Schiit Aegir(s) x2 monoblocks.

I currently run a pair of Schiit Aegirs into my Wilson Benesch speakers which are, I believe a 6 ohm speaker with no difficulty at all, 80 watts per monoblock and I never have it over 25%. Lovely sounding class A, first 10 watts are pure class A, balance of the wattage is something called class A "continuity". You will have to check with the website to get the details, listed as Class A in Sterephile. I beleive they cost me $ 2,500.00 new delivered in Canada so you should find a pair used well within your budget.