Joule Electra preamp and Aragon 4004 mkII

Klipsch claims 101 db sensitivity on that speaker.

I suspect that won't work well with the Aragon. The reason is that the amplifier will be operating for the most part at very low power. Most amps like this make more, not less, distortion at powers of less than about 5-7% of full power, which means that you won't be able to hear what the amp can do unless you play it too loud for comfort.

I recommend an amplifier of less power; no more than 60 watts for sure. If you want to go solid state, some of the First Watt amps made by Nelson Pass would be a better choice, and the JA can drive them just fine.

@foster_9

I think I can help. Reach out to me via e-mail and I can e-mail you a 150MKII manual I have in PDF (the manuals were often copies of copies, so some pages may not be easy to read, but it will do the Job). My Joule Info web-page ( http://sigsound.com/classic-product-info/joule-electra-info-page/ ) has a bunch of product info/literature, but I don't have any manuals up there yet though I do have a number of them (I think they are a few I still need to scan in).

The jumpers in question are the two located towards the rear of the circuit board. The default higher impedance setting is the jumper used on/across the front two (of three) pins. The lower output impedance setting is with the jumpers on the rear most two pins.

P.S. Yes, Joule-Electra is no longer in business - Jud retired and close up shop several years ago. I do provide service, support, and upgrades for Joule-Electra gear (even though it can be very challenging to work on gear with next to no technical documentation!)

Feel free to reach out to me via Audiogon or e-mail, phone etc. I'm not on these forums alot, but will get any audiogon messages.

Cheers
Rich

Good catch Ralph.
I was not even looking at the speaker interface and simply got lost answering the Joule/Aragon compatibilty question - sorry foster.
If I were driving Klipsch speakers with a sensitivity of 101 db, I would look hard at a tubed amplifier such as an S-30 or the M-60 monos (both made by a pretty good company) or the First Watt amps (great recommendation) if SS were the goal.  The nice thing about high efficiency speakers is that the power then becomes relatively cheap.
I have long driven fairly inefficient speakers so have ended up with large SS amps of which the Aragon was a stop along the way.   If money were not the object, and I didn't need a bunch of power but wanted a SS amp, I would like to try the Class D SPEC amplifiers....but I digress.  
Will the Joule/Aragon combo work, yes, will it sound best with the Klipsch speakers, probably not for the reasons Ralph states, but it will sound good with other less efficient speakers.

Thanks Mitch2 , Ralph and Signaturesound for digging deeper into my issue. I've since been thinking about a tubed integrated on the cheap to go with the Kilipsch, maybe vintage.   I can no longer afford to spend like I once did at Audiogon for newer stuff.   

If you really are thinking about vintage, Dynaco made a wonderful little amp called the SCA-35. Its class A and makes about 15 watts per channel.

If you find one it would have to be refurbished, and there are several inexpensive mods that will give it slightly more power with slightly less distortion. Unless you have an enormous room, this will be plenty of power with speakers of 101 db.