A-Line said
"The sound of the 275 really hasn't changed since the 1960's. My dad had one along with the C22 preamp from that era, 1964 to be exact.
Your setup sounds rather nice. No need to audition any new amps if you're satisfied with what you have.

"
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Now that's an interesting comment about the 275. Thanks. I'm very satisfied with my system as it now is. A couple of years ago I reluctantly sold my vintage MFA components due to ever-increasing maintenance costs. Since then I've tried numerous tube components - none of which I found satisfactory until now. I really have no reason to change other than curiosity. And we know what that can do to some cats....