Looking at the size of the heat sinks of the new Gryphon's and the quoted Class A, I don't believe they could be pure class A, maybe sliding bias as well.
There were ones going back 10 years that were huge and only 100watts total they could have been pure class A or 3/4 and the rest A/B.
There's a lot of fudging going on with quoted class A figures. The only ones I know for sure, were the water cooled ones I built, and maybe the forced fan cooled early Krell KSA50 and KSA100 not the 100s
And also a 20w Nelson Pass A40 project also a fan force little monster, from the 70's which was the basis of my 150w water cooled ones.
[url]http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0CDAQFjAF&url=http%3A%2F%2Fwww.firstwatt.com%2Fpdf%2Fart_a40.pdf&ei=SKBnVYLoI4Xj8AXY5YPIAg&usg=AFQjCNFzV3J8CTmkP6fI6mreRC5uu3Ymaw&bvm=bv.93990622,d.dGc[/url]
Here was one for sale one ebay.
[url]http://www.ebay.com/itm/Nelson-Pass-A-40-Class-A-Stereo-Amplifier-A-Very-Rare-Classic-/291381081421?nma=true&si=ph3vIqnZtW%252Bz6wdpAIVab%252BCAJoI%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557[/url]
Cheers George