I own a NHB 108 copy.One that looks like the real deal.The one with the big blue Sprague caps and two pairs of output transistors.
It matches really well with my Supratek preamp.Best sound I have ever had from that and there has been plenty.
Superb sounding amp.A bit speaker fussy though.It much prefers real 8 ohm speakers not 4 ohm.All the good stuff of a really good SET but none of the bad .Very high resolution but also very refined and organic and sweet sounding.Very good with vintage Tannoys and horns.