j. pierce Posted January 26, 2006 Report Share Posted January 26, 2006 I don't cruise many forums, but then I remembered the general topics section here at PG, and figured the folks here seem pretty knowledgable … Replacing the pre-amp tubes in my amp sometime in the future, and just curious is there an appreciable difference in preamp tubes marked 12AX7A and 12AX7B? Is it like the difference between 12AX7's and 12AU7's, is it a matter of gain, or what? At first I thought it was a manufacturer difference or something, but I've seen the same manufacturer (Sovtek I believe?) selling 12AX7WA and 12AX7WB tubes . . . I have some data sheets in one of my books, but nothing is popping out at me as radically different, and some google searches and some looking at manufacturers websites hasn't given up much info. thanks folks! .j Quote Link to comment Share on other sites More sharing options...
Scott Rosenberger Posted January 26, 2006 Report Share Posted January 26, 2006 http://thetubestore.com/ Quote Link to comment Share on other sites More sharing options...
Gorecki Posted January 26, 2006 Report Share Posted January 26, 2006 http://thetubestore.com/ Cool link dude! Quote Link to comment Share on other sites More sharing options...
syxxstring Posted January 27, 2006 Report Share Posted January 27, 2006 12au7's and 12at7s have lower gain than 12ax7's. Often becasue they are direct swapped they are used to change an amp or pedals gain structure. Quote Link to comment Share on other sites More sharing options...
Scott Rosenberger Posted January 27, 2006 Report Share Posted January 27, 2006 http://thetubestore.com/ Cool link dude! They ship really fast too Quote Link to comment Share on other sites More sharing options...
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