As a dealer for both VSA and Spectron and Goldmiund(not familiar with the Gryphon) I can tell you that the Spectron and VSA do match very well.But even better is the Stellavox,or JOB.Quicker,better high end.Price point is similar but less wattage,but does not really matter as the VSA is efficient.Both these pieces are off shoots of Goldmund and are pretty much as good as it gets at that price point.
Spectron versus Gryphon Callisto
I own the Callisto 2100 and love it. But I am haunted with the reality that Von Schweikert voiced the VR4 HSE III using the Spectron Musician II. Having worked for Jim Thiel, knowing that he uses a host of amps to check relative sounds, for the obvious reason, I wonder if anyone out there has ever compaired the digital amp from John Ulrich, Spectron, with the Gryphon. This is really silly since the Gryphon outdistances almost every separate combination I have ever put together over the past 20 plus years, and it is a wonderful piece. But, like the guy in Dirty Harry said, "I gotts to know." I spoke to Greg Weaver who reviewed the VSA, and then reviewed the Spectron. While he loves the Spectron he has not experienced the Gryphon. This is only Holy Grail pursuit, and not worth your time, but if anyone out there knows, please let me know.