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  • #1

    Ideas for a project

    I have a PT that used to sit in a quad EL84 power stage (I measured 360VDC after the rectifier). I'd like to build something based on this PT. I don't really know what a sufficient anode voltage would be for different types of tubes sitting in a guitar amplifier.

    Any suggestions on what tubes I should use in the power stage (is there some other tubes than the EL84 suitable here)?
    Last edited by überfuzz; 05-17-2014, 10:35 AM. Reason: spelling
    In this forum everyone is entitled to my opinion.
    Tags: None
  • #2
    6V6? 6L6-G (cokebottle oldie type)? 7591? Ampeg ran those ~370 in some small combos... 6CZ5 (cheap - burn em up!) 7868? 7687? 6973? 6AR6? 6K6? I have no idea how many of those sound...

    You're probably limited more by heater current than plate voltage. You've got 3A + preamp tubes. Depending on how many preamp tubes, scratch a few & get a bit more heater amps. You could run a pair of EL34s if you wanted to, I reckon. 6AR6 I mentioned cuz they're cheap, 6CZ5 too. The first would be grossly under spec, the second over spec, but we all know about the Fender Champs & Deluxe Reverbs.

    Justin
    "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
    "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
    "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

    Comment

    • #3
      Originally posted by Justin Thomas View Post
      6V6? 6L6-G (cokebottle oldie type)? 7591? Ampeg ran those ~370 in some small combos... 6CZ5 (cheap - burn em up!) 7868? 7687? 6973? 6AR6? 6K6? I have no idea how many of those sound...

      You're probably limited more by heater current than plate voltage. You've got 3A + preamp tubes. Depending on how many preamp tubes, scratch a few & get a bit more heater amps. You could run a pair of EL34s if you wanted to, I reckon. 6AR6 I mentioned cuz they're cheap, 6CZ5 too. The first would be grossly under spec, the second over spec, but we all know about the Fender Champs & Deluxe Reverbs.

      Justin
      Thanks a lot dude!

      I'll check these tubes out, in detail. About the heater current, there were 4 pre amp tubes in the old amplifier, in addition to the power tubes. I should be fine I think, as I don't plan to do a beefy pre amp section.
      In this forum everyone is entitled to my opinion.

      Comment

      • #4
        Scratch the 7687, they seem to be a triode/pentode preamp tube... I thought they were power pentode w. a triode section. Sorry bout that!

        Justin
        "Wow it's red! That doesn't look like the standard Marshall red. It's more like hooker lipstick/clown nose/poodle pecker red." - Chuck H. -
        "Of course that means playing **LOUD** , best but useless solution to modern sissy snowflake players." - J.M. Fahey -
        "All I ever managed to do with that amp was... kill small rodents within a 50 yard radius of my practice building." - Tone Meister -

        Comment

        • #5
          Originally posted by Justin Thomas View Post
          Scratch the 7687, they seem to be a triode/pentode preamp tube... I thought they were power pentode w. a triode section. Sorry bout that!

          Justin
          Hm... I'll let this one pass.
          In this forum everyone is entitled to my opinion.

          Comment

          • #6
            A pair of 5881 would be tasty at 360v season to taste with the preamp of your choice.
            They would last a long time and sound great if biased properly.
            If you decide to sell the PT,
            I have been looking for one like that.
            Cheers

            Comment

            • #7
              Originally posted by stevehoover View Post
              A pair of 5881 would be tasty at 360v season to taste with the preamp of your choice.
              They would last a long time and sound great if biased properly.
              If you decide to sell the PT,
              I have been looking for one like that.
              Cheers
              Dude, isn't that the Ivan version of a 6L6 tube? If so, they are probably not so pricey. I don't want to sell it. I have no amp in the 30-40 W region and would like to build one. I actually think I'll start design a power stage with these tubes. (Hopefully I can find some nifty stage on the web)
              In this forum everyone is entitled to my opinion.

              Comment

              • #8
                Oh, while I'm at it. If I go with tube rectifier, when I chose tube model, is it the max voltage from the transformer that I need to match against a tube.
                In this forum everyone is entitled to my opinion.

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