Ditto. BTW, that was a great price you got.
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There is good reason that you prefer the 5751s over a regular 12AX7. The 5751 was designed, primarily by RCA, as a low noise, lower gain tube than the 12AX7. It also has other characteristics that make it a little bit different than the 12AX7 (look at the curves).
One of the best versions is the Sylvania GOLD BRAND type. They are now become quite pricey as folks start to use them as substitutes for 12AX7s where gain is not too demanding and reduced noise floor is more important.
i have a ge 5751 black plate, which i use in an audionote cd player. it's my favorite tube, for reasons opposite to those stated above, namely it significantly rolls off the treble, adds a touch of veiling and takes the edge off most poorly recorded discs.
another great tube is a ge 5814 black plate. i have often substituted this tube for a 12ax7 in preamps or cd players.
you might also consider a 12ay7 as well.