Mini amp with passlabs / tube like sound

Amp Camp amps are not really great they have hi distorition #'s, they were designed for DYI teaching classes not critical listning.

There are better optons out there.

Such as?  (There was nothing listed in your post) 

The OP stated he has a Musical Paradise amp, which is about a $500, compact tube amp.  That, combined with the DIY speakers tells me this may be a lower-budget proposition.  The Amp Camp amps are inexpensive, Class-A, Solid State, compact and designed by Nelson Pass which could get the OP where he wants based off the criteria mentioned.

I agree there are better options out there.  But at what cost?  

CHOCO Emie is a fine small footprint int. amp. rated quite good by the usual Youtube audiophile reviewers.  USAM has one listed for sale.

First Watt terrific, though not small or light weight...even Pass Labs doesn't recommend the  Amp Camp...

My favorite recent small amps are Nuforce STA200, Fosi V3 mono blocks, upgraded Parasound Zamp V3 ...I own and use all 3 ...

I've had good luck using a tube buffer between my amp and preamp. It takes the edge off the solid state sound and adds a tube sound. A friend tried multiple Yaqin buffers and suggested the single tube model. I've had one for well over ten years and used it with a couple different systems.