Small Footprint SS Power Amps

Maybe the AGD GaN amps. There is a thread on them.

BTW - I have 2 AHB2’s hidden in my sons IKEA toy shelf which are 12 inches wide. A perfect fit.

Schiit Vidar

My new (to me)  Herron M1 monoblocks are pretty awesome. Small footprint, 150 WPC, but you need two. 

Class does not matter nearly do much as the size of the power supply. Look for seperates if you need a small footprint.
I' m getting 50 + 50 + 100 in 1.5" x 4" x 7" with a much larger remote power supply.

If you can afford and have the room
THOSE VINCENT monoblocs are simply wicked great. 
Vincent T-700 monos. Amazing German amps!
if I had the coin, I would be all over them!

 Dropping 800 on the avantone cl-200 in another week for a backup amp.

 Will be watching  my saved stash for enough for those Vincent monos.