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12SX7

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12sx7

Is really the 12SX7 tube a 6SN7 [12SN7] ? :cool:
 

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The picture of your 12SX7 doesn't look like the ones I have. Mine have a large RCA logo on the tube and the box is a traditional RCA red,white, and black box of the fifties. There is no typewritten JAN or tube name on the box.
I know that I've tried a large number of Octal tubes in my Mu-Follower preamp. It originally ran with 6SN7s- the best of which was the WWII era Mil-spec Sylvania with the anchor symbol on the silver base. Sylvanias in general worked better than most other brands. They sounded cleaner with less distortion and muddy bass. The worst was a NOS RCA 6SN7 which had very muddy bass and midrange-like a poor 12AU7.
The 12SX7 easily sounded as good as the Mil-Spec Sylvania. It sounded cleaner and had less distortion than any other Octal tube I've run in my preamp. This may be because I'm running about 250V B+ in a totem pole design. I understand that the 12SX7 runs best with about a 90V plate voltage.
 
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