Plinius SB 300 v Plinius SA 250 MK IV


Have any of you heard first hand the SB 300 (V) the SA 250 MK IV?
I'm curious as to which amp you liked better and why?
What's the difference between the two as far as Sonics?
Thanks in advance, for those that can help me.
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Although I haven't received any responses in this form I have received some emails and had some phone conversations with some audiophiles that have heard the Plinius SB-300 and the Plinius SA-250 MK I, II, III, and IV.
Bottom line is I have ordered a Plinius SB-300 and hope to have it in ten days.
If anyone is interested I have a Silver Plinius SA-100 in excellent condition with original manual and box that I will be selling (and listing on Audiogon along with a Forte 4A) as soon as I receive my new SB-300.
It will be good to test the sa100 vs the sb300 before you sell it and also let us know.
I have been a tube amp guy since 1986 and bought Harbeths a few months ago. They need more current than my Air Tight 300B can give so I bought an SA-50III. Maybe it's the Harbeths but I didn't know S/S could sound so good. Then again, maybe it's the Plinius.
The Plinius is very tube-like. My reference system consists of the Cary 2A3 monoblocks.