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Great post and a wealth of more relevant information!

Nice job as always, Abe.

Yes, as I recall, you had an MF2250 and upgraded it to the 2250A. I never did that upgrade, but I understand you didn't hear a difference and it seems like most owners agreed with you. Today's 2550 and 2275 are likely the same circuits as the A version of the older amps, but the SE have the teflon caps and likely are more dynamic and detailed.

What I find with my trusty MF2250, which was fully refurbished by CJ two years ago, is that it wakes up with the right preamp. It certainly sounds dynamic with the Rogue preamp, at least to my ears, but YMMV of course.

Been meaning to do a mini review of the Rogue now that I've had it about a month or more. I really like it with NOS Mullards.
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"If you are the owner of a new stereophonic system, this record will play with even more brilliant true-to-life fidelity. In short, you can purchase this record with no fear of its becoming obsolete in the future."


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