Integrated S.E.T Amp and Bookshelf Speakers Recommendations

Why are you looking at Harbeth? They are not high high efficiency speakers!!

Analog Ethos

James Burgess

not integrated but they have volume knobs

speakers: Klipsch RP600

I agree with @yogiboy, Harbeth's wouldn't be on my list for a low wattage tube amp. Another story if you were considering  a 35wpc+ PP amp.

The Audio Notes are great speakers but they are not for everyone. I love them but some guys feel that they sound "dark."

You haven't described your room so it's hard to recommend. IMO, set amps and good horn speakers enjoy a magical symmetry. Certainly there is a whole line of new and vintage Klipsch Heritage, starting with the Heresy and on up. I'm partial to vintage JBL monitors featuring CD horns, but that's me.

Another way to go would be "full range" single driver speakers. I've owned Omegas and Coherent Audio from Canada. Both can sound wonderful and can be mated to subwoofers if you feel that you needed more low end punch.

FORGET the low powered SET tube amp!!!
First off,RETUBING COST of 300B tubes every few thousand hours is OUTRAGEOUSLY EXPENSIVE....You could go Single Ended EL34 or KT88 but still limited power available or one of the new Single Ended KT150/170 amps available but you’ll still have to retube every few thousand hours.
If you want it all,go with a PURE CLASS A Solid State amp from Pass Labs,Sugden or Luxman!!!
Add a pair of smallish stand mounted monitors from Spendor,Harbeth,Reference 3A,Dynaudio or Sonus Faber & bliss out!

I'll balance the argument.  SET is the only way to go.  I have tried a few SS amps since going tube and always disapointed. And push pull is a compromise that cannot hold a candle to SET.  It is accepted because people are married to their low sensitivity speakers.

that said, you aren't looking at high end SETs so you aren't getting the highest quality possible sound.  And there aren't many good options in bookshelf speakers and high sensitivity.  I look for 94db or higher but you can probably get buy at 92 if your amp has high current.  Look for a used decware.  I have an SE84UFO that is rated about 2 wpc and will fill my room using 95 db speakers.  It is my back up.  I am currently using a 4 wpc bespoke custom amp with 98 dB speakers.  Really overkill on power.

But if you're looking in this price range, you won't find an SS amp that will hold a candle to a simple SET.  Try to find one that is point to point wired, not circuit board.  If you can find an Aric or a Sachs that works for you jump on it.  

Jerry