Threshold, Levinson, Bryston, Krell, ?others? used amps

I have A Bryston 4BSST and really like the sound and build quality. I picked it up second hand no regrets. 

The D-Sonic M3a-800S amp goes for $1475 new and pumps out 400/800W into 8/4Ohms.  Yeah it’s Class D — shoot me.  There’s a 6Moons review that indicates it punches well above its price, and I think they offer a 30-day trial.  Commence firing. 

I've owned a Nak PA-7aii for a few weeks and the ML 23.5 twice now for 15 years.  It wasn't even close.  The 23.5 is the best amp for Maggies and this was the word from Steve Whiney.  I have Tympani 1-d's and JBL Hartsfields.  Funny thing, I ran the Hartsfields with a Marantz 8b for 10 years straight and put the 23.5 in it's place recently.  There was little difference sonically, other than better bass control.  Apparently, the 23.5 is biased for the first few watts in class A.  It is simply one of the very best SS amps ever made.  Look to pay $2,800.  Now about those ML2's...

Another shout for a Mark Levinson 23.5 and also the 27.5. I own both. They will hold their own against many modern amps costing many times more.

But? These monsters are now ancient and need servicing and probably recapping at great additional expense. Also finding someone trustworthy to do it is a problem.
The smaller ML27.5 blew up spectacularly, complete with awesome pops, bangs, smoke and smell. I emailed Daniel Hertz who is Mark Levinson's new business name, not to do the repair but to recommend someone who could. Got no reply, so good luck with any repairs needed. My ML23.5 now has humm and needs attention. A readable schematic could not be found on the net.

The ML23.5 was chosen after listening to Krell, Aragon, Threshold and others and I would love to restore it to optimum working condition but fearful of wasting more money.

There is one brand seldom mentioned and which I have owned and can thoroughly recommend is anything from James Bongiorno. Look out for the original GAS Son of Ampzilla or his later Sumo The Nine (60W pure class A) or the updated and superb Son of Ampzilla II and his last effort before he passed away, Spread Spectrum Technology,

I personally like Bedini amps. I owned the original 200/200 pure class A, this amp was good to 1.5 ohms. I ran it on the Infinity Servo Static 1A electrostats and the original Martin Logan CLS for 40 years with no problems. I also have the original 25/25  pure class A and the 10/10 class A, which I have also had for 40 years with every day use. These amps sound better than most solid state amps and hold up.