Amp for Vintage Heresy

I run my Heresy and Forte II with a Dennis Had Inspire 45 amp and Had LP3.1 preamp.  Both sets of speakers have Crites upgrades, and the amp uses Emission Labs tubes.

The Inspire 45 may only put out around 2 watts, but it makes my Klipsch speakers sing.

I had a NAD 316B with vintage Yamaha NS-670 speakers while assembling Yamaha gear from same time period ~1976-78. For a few weeks had both NAD316 and Yamaha CA-1010 with same speakers. Sound difference? No idea other than Yamaha had more power for A-B volume test. Add in that at 56yrs old, ears are damaged goods as are everyone's. Perceived quality...well, no contest. Yamaha has VU meters, real wood veneer case, metal knobs & switches that click when you use them, heaven. Add in turntable and parents album collection from same time period is synergy at it's finest. You hear with your eyes better than your ears 

Some good recommendations above. There are so many great solid state power amps available that tubes should be left for preamps and sources, ime, if you want some warmth and coloration. You need to damp the mid and high frequency horns and the woofer baskets using a Dynamat type material and use self-adhesive sealing tape (used for doors/windows) for the rear panels (between the cabinets and rear panels for a better cabinet seal. Upgrade the crossovers using Crites, get a fast subwoofer (or two), and experiment with raising them off the floor with good solid stands (I prefer the Heresy elevated). BTW, I consider myself quite knowledgeable and experienced with Klipsch, specifically the Heritage line. If PRAT is important to you, solid state is the way to go. You need to determine what sq attributes and characteristics are most important to you. My best, MrD.

When I had my Heresy’s they were a great match with my McIntosh 240. 

Overall I agree with @mrdecibel but really did enjoy a Tube Amp and Tube Pre with my Heresy 1's .  I even ran a Tube DAC with them to take some of the brightness out as they were usually  in smaller room.  My son now has them and uses an old but fully restored solid state Luxman 100U and I was pleasantly surprised how well they sounded.

The crossovers were updated by Crites . I sent them in and they were reasonable to ship and have them do the work correctly. I sent the crossovers in only, not the speakers.