SET amp for high efficiency horn speaker

deHavilland Aries 845 is a good one.

Check out the reviews of the Art Audio PX25. It has the midrange of a 2A3 with added frequency extension and dynamics. Very highly recommended for very high efficiency speakers.

Blessings, Bob

Hi
I listen to jazz and classic music
SET that I heard before with different speakers are
CARY, ASL, Wavelength and more
I can pay $ if that would make best sound at reasonable sound

As Inhisservice has mentioned above, the Art Audio PX-25 is right in the running for one of the greatest mid-power SETs commercially available. I just sold mine after 2-3 years of complete joy due to space limitations in my new apartment.

As one pro reviewer put it(approxiamtely) - "they recreate instruments, space, as if lit from within".

You can find them here on the used market for $2,700-$3,700.

Also take a look at the hand built Deja Vu Audio SET and PP amps in both 300B and 2A3/45 configuration, which come up on Audigon occasionally. Those built around vintage Chicago and Acrosound output transformers are quite amazing.