Sugden Amps

I have the Schiit Freya+ preamp, using it with an active speaker pair at the moment, and it is an excellent preamp. In tube mode, (with 6SN7 x 4 ) it gives 12dB gain and gets fairly warm, less so if using the LISST solid-state "tubes"  I have not tried it yet with Schiit's amps, mono or stereo. (I'm tempted, I have a pair of ELAC speakers that might benefit.)

I was just looking at Youtube reviews of the Sugden A21SE and the Musical Fidelity A1 (newest version). It was interesting to see the Musical Fidelity had twice as many output filter capacitors in its circuit (all of them 10KuF in both), although the Sugden seemed a little more robust overall. I'm not sure what to make of that.

Others besides Kevin Deal have reviewed the Musical Fidelity A1 (new version) very favorably: Taron on the YT channel A British Audiophile. As far as I can see, he isn't selling the amp, just reviewing, He gave it an "outstanding" rating, which he does not do often. It apparently is toasty, despite being only 25W. The form factor is attractive.

The benefit of Klipsch Heritage speakers, aside from nice sound, obviously, is the loudspeaker efficiency and the opportunity to experiment with confidence when it comes to lower power-rated amplification. If you aren’t going with a pure class-A amp (something about that "all-day, everyday" desire and the reality of significant heat generation from pure class-A makes me wonder if that is a good thing long-term), there are good hybrid options in Class A/ Class D. (NuPrime’s IDA-8 is Class A-Class D and has a low noise floor. Very compact. 100W.) The JBL SA750 has A/AB ("Class G") topology with a streamer, DAC and remote, 120W.

At the risk of offending those gentle readers who do not prefer direct-to-consumer products, you might also consider the Schiit preamps and amps for your Klipsch Heritage speakers. The Freya+ (ss/buffer/tube-selectable and rollable) and the new Kara (ss) are balanced-output and the Schiit Gjallarhorn and Aegir "continuity" amps can be run in monoblock or stereo (more power with mono, obvs, and with the Aegir, balanced input is only with mono). U.S.-made, as with all Schiit products, if that is important, and power output would be adequate: 80WPC with Aegirs and 30 WPC with the Gjallarhorn, either greater than the Sugden, FWIW, and less expensive as well, all-in.