Pure Class-A Amp under $2000 (USED)

The Aegir will double power into four ohms when used as a stereo amp. As monoblocks, 80 watts into 8 ohms. Not recommended for a four ohm load as monos. The OP might get by with his 6 ohm SF, but I’d reach out to Schiit and ask.

You might consider one the First Watt amps.  I’ve had the First Watt F7 in my system for the last few years paired with a Schiit Freya (OG) and Tekton Double Impacts and have really enjoyed it.  Lot of bang for the buck.  I’ve recently upgraded my amp, but felt like I had to spend over twice as much (retail) to make it worth my while.  The F7 is rated at 20W into 8 ohms and 30W into 4 ohms.

Perhaps look at for a Sugden A21 Signature or SE demo unit. I went through Goldprint Audio and got a demo A21 at a good price--great customer service as well. The A21 is pure class A---super sweet sound, 23 wpc.

if you  like some volume, low watt amps are not for you, if you just like mid volume, then you may be fine with the proper speakers.

me, i like loud, raven, venom, celtic frost, pat travers, motorhead, living death, assassin, bathory, humble pie, hirax, bitches sin, onslaught, jungle rot, malevolent creation, etc so i need my amps and my speakers which are warm (less treble, not searing) which makes for more relaxed, listening time for me.

if you like some JAM time, get min 200-300W rms. there will be no clipping, no loss of sound, no muffled anything.

if you just like barry manilla, james taylor, ravi shankar, etc, the low watt will sound great!