I guess I should update my system here............
On the strong recommendation of a friend, I acquired a Plinius SA-250 Mk 3, which had been recently serviced and rebiased by well known previous distributor (Vince) in New York. In learning more about the SA series Mk1 -3, I discovered they are basically the same amp and then the Mk 4 has a different power supply. The Plinius is one of the best amps I have ever had in mystem for sure. Great for H/T because you can put into class A/B mode and then for serious audio you can select Class A all the way - toasty though! Sounds best on the ReQuests with modest Kimber 8TC cable with pro oxygen free soldered banana terminations. Very compatible with planars and set to be used with the Apogee Scintillas I am rebuilding.
One of my Spectrons is being upgraded to latest revised (unpublished) spec on the class D module and these amps provide complete clarity and detail, the Plinius excells in drive, control and texture.