I've been running good pair of Mullards in the input section of my LSA Statement integrated for almost two years now and was contemplating rolling them for a really good pair of 6922's. The Mullards replaced the stock tubes and made a slight difference in the openness of the stage, though that may have been confirmation bias.
Before I drop several hundred dollars on a pair of tubes, do different levels of input tubes really make a difference in sound? Can they do so on a physical level (as in, is it physically possible for them to do so)?
Ditto for the stock 12AX7's in my Jolida phono stage.
When I picked up a pair of mono amps used last year the owner had put in a pair of NOS RCA 12ax7 in the input stage, I tried several modern 12AX7 and nothing came close.... the 6922 driver isn't as critical and I'm hard pressed to notice any difference in that position .
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