300B Tube Amps with 15/16 Watts Per Channel?

Spatial Audio lab produces dual 300b  monoblocks designed by Don Sachs, ‘Blackbirds’  24wpc. 
 

If you don't mind assembling a kit, Bottlehead makes a 300B model called the Kaiju that can be configured to work as a 16W monoblock amp. I have the Kaiju configured in stereo mode and am very pleased with its sound quality. I can only imagine that the Kaiju in monoblock form would sound just as good or better, but with more power. Bottlehead kits are very complete with superb instructions, which makes for a relatively easy build.

Absolutely one of the best is Aric Audio. Aric makes a 300b parallel SET amp, the Super 300b PSET.

Allnic Audio A-6000 monos run 2 or 4 x EML 300 BXLS per side.  

Best tube amps I've ever found.  Highly linear and powerful w the beauty of tubes. 

Thanks to everyone who replied to my question and provided so many good recommendations..Looks like I need to spend more time at audio shows and retailers :)....