Best amp for natural timbre of unamplified acoustic instruments & vocals w/ Revel F32?

I've heard the F32's with tubes and I didn't hear sterile.    I did hear un-involving compared to other speakers.....

I owned Revel Studio 2's for 2 years and ended up replacing them
with Magnepan 3.7s which I still own after 5 years.

It sounds like you are after a more musical, involving presentation.

In that same price range, I would audition the Ryan 620.  I've heard
it at the shows and I believe it is everything Revel isn't.....

https://www.youtube.com/watch?v=hkX7v5JeJD0

If you stay with the Revels, and want warmth......you're also going to need enough juice to drive an 86db efficient loudspeaker.

My first candidate would be the Rogue Cronus Magnum integrated....

May cost a lot to get the best from those Speakers. As others have said, you might check with Revel to find out what they suggest - they will know.

And - as others have said, you may find it more effective (less frustrating and less costly) to swap your speakers.

The most cost-effective Speakers I’ve found to deliver the kind of sound you’re after are the Wavetouch Audio Grand Teton’s. Not the "prettiest" - but, certainly the best sounding - by far. For the money. They sound as good, or better, as the others mentioned for acoustic music. Efficient and easy to amp.

Or, the Magnestand Maggie’s (pair on usaudiomart for sale) are also superb (better than stock Maggie’s by a lot). As all Maggie’s, require a bit more powerful amp than the GT’s.

Both superb!

Thanks to all for the responses!  I am using them with a Conrad Johnson MF2250A  120w/ch solid state amp, VTL TL2.5 tube preamp and predominantly BelCanto Dac1.1.   A first for me, recently the circuit breaker tripped in the CJ on Reference Recording  "Tutti"  cd.  It was very loud though, but they are inefficient.  The separation of different frequencies is impressive and I wanted a floorstander this size.  I still own the original Harbeth Compact 7 and the last version of KEF Reference 104.2 (bi-wire).
They sound good on everything.  One can say of course that the F32 is far more neutral but at what cost? 

I might add that I just acquired these without listening first and at a good price.

I did try them briefly with my Manley KT90 Retro 100 amps.  I will try again. I thought less involving, less control than the CJ.