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Conrad Johnson SS amps

I am currently looking for a new power amplifier to drive my Martin Logan CLSIIs (4ohm load). I am deciding between CJ's MF2250 and MF2500. I was wondering what the difference was between the the stock model and the "A" model. ie: MF2250 vs. MF2250A. I would also like to know if they can they be bridged? Would I get better results using two MF2250 amps or a single MF2500 amp?
msilin
sabocat59
98 posts
 
The only thing I would do with a MF2500 is either send it in for an "A" upgrade to CJ, or send it to Bob and Gary Backert and let them do their own upgrade. The latter certainly did a good job on my aging MF2250.
jafant
18,824 posts
 
Updating this thread-
anyone still using, new or older, CJ SS power amps?
j_stereo
130 posts
 
I have a Sonograph SA-250 (I see there is one for sale on this site right now) and although I have not used it in awhile due to equipment swapping, in my opinion it is a very fine sounding amp.  I believe this is a Mosfet amp. 
unsound
7,311 posts
 
I think the Sonographe amps unlike the c-j MF ss amps used bipolar devices.  Though sounding slightly different, both were very good. Either one might be preferable depending on the rest of the system.
unsound
7,311 posts
 
^Perhaps I should have said earlier c-j MF ss amps. I believe the latter ones use both mosfets and bipolars.
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