Best $1k Integrated Amp for Spendor S3/5's

I can't speak to the pairing of your speakers. I have an ASL 1001 DT with NOS tubes. This amp is often sold used here on Agon. It's an amazing piece and at it's price a great value. You can buy one used with money left over for NOS tubes. In my system this integrated sings. Stay away from the older models.

Just a comment on the Unison Unico: I had the Unico for a couple of months,
and I was not very impressed to say the least. I tried a couple of different
tubes in the Unico but compared to the EL34 based Jolida it sounded veiled,
lifeless and boring. I really preferred the built and remote capability of the
Unico but sold it after 4 months and kept the Jolida. Maybe it was just a bad
match to the speakers (the person who sold it to me also used S3/5 but did
not like the Unico), but my wife thought it was the worst sound we ever had
at home. Anyway, it got me to the point to really question professional
reviews like for example Sam Tellig's ...

The Jolida is an amazing amp for the money and worked exceptionally well
with the Spendors. I did not hear the Primaluna or Onix, but heard many good
things about them. The Prima has selfbiasing and a better built which might
make it a better option than the Jolida. Sonically the Jolida is hard to fault at
the price.

All the brands you mentioned should be great to built a sub $2500 system,
now its up to you to find out what you really like...

Enjoy!

Rene

Without a doubt, the Exposure 2010 is among the best choices you'll have. Arguably better than the Nait in PRaT, the S3/5 will enjoy the additional power and you'll see more bass extension and (heaven forbid!) a soundstage. I've had both Naim/Spendor and Exposure/Spendor combinations and wildly prefer the latter.

I have 2 Spendor dealers close by and I reached the conclusion that I really liked Spendors with a tube amp much more than solid state.

Interesting. Which tube amps?