Klipsch Forte IV ... what amp ?

I don't think that I am allowed into this hobby without trying something

else

The grass isn't always greener across the street. 

Saki70, I had two Prima Luna preamps - a Prologue and then traded up to the Dialogue Premium.

Ended up deciding that they were just not lively enough in my system with the Thiels and sold the Dialogue.

The interesting thing is that I was in an audio store listening to Dali speakers and a solid state amp about a month ago and I asked to hear the speakers with a Prima Luna EVO 300 or 400.

I was amazed at how similar the amp sounded to my old Dialogue preamp. For me, PL gives me the spit on the microphone but not the sizzle as as the spit hits the mike. My ears and my gear - YMMV.

My only point is that you owe it to yourself to listen to as many amps/preamps as you can. Different brands do not sound alike.I am fortunate to live in the Indianapolis area and there is a high end dealer that puts up with me and has let me audition used gear in my home. Hopefully, you can find a place like that where you are.

Thanks for listening,

Dsper

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The main thing that is worrying us is the low impedance and what requirements

a tube amp would need to handle it .

Thank you 

For me, PL gives me the spit on the microphone but not the sizzle as as the spit hits the mike.

Try some Gold Lyon KT88s. 

I've used Prima Luna Dialogue Four, custom built 300B SET monoblocks and Coincident 845 SET amp with my Klipschorns which has impedance drop to around 3 ohm at 100hz, sensitivity is higher at 104db. I've also  auditioned Music Fidelity M2SI and Denafrips Hyperion amps, both class a/b solid state.

All have handled the impedance drop just fine. I do prefer tubes with Klipschorns, and expect all Heritage line better with tubes. As for sound quality, my favorite amp with the Klipschorns is the 300B's, sweetest sound which compliments Klipsch inherent qualities best. The one issue I could see in running 300B amps is handling your impedance curve, my 300B's monoblocks each have power supply equivalent to what one would normally see in stereo 300B, so no issues for me. 845SET should be no problem, and the push pulls fine as well.