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  1. J

    Quad preamp tube experiment with pics of gear

    I have quite an assortment of NOS and newer 12AX7's , so I thought I'd post the results I found. I played through a 1957 custom shop heavy relic, and a 1952 tele reissue with a humbucker in the neck ala keith style. So mind you , my final choices may not work for you if you are using a les paul...
  2. J

    Mesa 50/50 which preamp tubes feed channel A and B and PI

    Hi I want to change the preamp tubes but am unsure as to which tube belongs to which channel. The amp is an older 50/50 built in 1989 thanks in advance for your replys.....J
  3. J

    how old is my heartbreaker?

    Hi my name is john I'm new here I just bought a heartbreaker serial #111798 I was wondering how old it is and whether it is the 1st or 2nd revision. I really dig this amp it really came to life when I threw in some mullard 163's, some amperex and a telefunken smooth plate for the PI anyways...
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