You get home too early, Scott.
(2nd dibbs.)
First, Mike, you already say it is 'AMAZING', so he is definitely moving in the right direction.
IF he would like to be conservative until he knows what he wants better, that pair of Dynaco integrated, SC(A?) can be modded up a lot to cut the pre section and crispen up the amp. I have a notebook of stuff I've gleaned off the net, 2 being guys that kept visual logs as they tinkered with them.
I never got ballsy/knowledgable enough to go after mine. Would be happy to do same right next to you if you felt like helping him tinker with what he had.
And yeah, get a decent tube pre and rid of that tube buffer. I still find my Clarinet a bargain for the dough. ..Bloated noise (in my opinion) with that X-10D, like some of the pre in the SCA's, as I understand it.
Well, anyway, those amps put out 14w/ch, and might work for a while so he could be less limited in how he chased the phono and crossover end.
Just a thought.
Would love to hear the Heartsfields myself.
Fell in love with them at RMAF to go back everyday.
Regards,
DeadFish