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  • History & Facts About Input & Driver Tubes

    N/A
    Last edited by Dr.Ears; 02-08-2018, 02:15 PM.

  • #2
    Doc, where does the 6DJ8 and its family fit in your scheme re small signal tubes? (ECC88, E88CC, 6922, 6N23P, 6N11) there was a war of words back in the day between Roger Modjeski and David Manley whether the 6DJ8 was even appropriate for audio use (widely used at the time by Counterpoint, ARC, et al). AFAIK, CJ never used them in their preamps at least not thru the '90s.
    TechDAS | Graham Eng | ZYX | B.M.C. | Boulder | Magico

    "Listening to Analogue music is an act of rebellion in a digital gulag" - Simon Yorke

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    • Dr.Ears
      Dr.Ears commented
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      N/A
      Last edited by Dr.Ears; 02-08-2018, 02:15 PM.

  • #3
    6DJ8 tubes were originally designed for TV tuners, not audio. They are prone to being highly microphonic. I like most other versions of the 6922 family you listed and the CCa that you didn't list.
    Micro Seiki SX-8000 table with flywheel, SME 3012R arm, SME 312S arm, Lyra Etna SL and Dynavector XV-1S cartridges, ARC Ref 3 phono stage, Otari MX-55 tape deck, Ampex 350 repros, Roon Nucleus Plus server, PS Audio DSJ DAC, ARC Ref 6 pre, ARC Ref 75 amp, JBL 4345 speakers, and Def Tech Ref subs.

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    • Dr.Ears
      Dr.Ears commented
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      N/A
      Last edited by Dr.Ears; 02-08-2018, 02:16 PM.

    • mep
      mep commented
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      Dr. Ears-Where do you get your info on tubes that are the most counterfeited? Why would someone spend their time counterfeiting tubes that aren't that common and many people including audiophiles don't know much about? Why wouldn't you spend your time counterfeiting tubes that are well known, widely used, and have a big demand like the 12AX7 family of tubes?

  • #4
    Not to go too much OT but there's also 7DJ8s/PC88s that sound darn good depending on where and how they are used.

    CJ used 6922s to great effect as driver tubes in their amplifiers. They switched to the 6H30 and 8080 to lower driver stage impedance. The Phillips 7DJ8s (and same for the Tele) also was quite an improvement over 6922s in the GAT preamplifier. Some friends also found the Tele 7DJ8s sounded better in the driver section of cj amplifiers in place of the Russian 6922s.
    Myles B. Astor, PhD, Administrator
    Senior Editor, Positive-Feedback.com
    ________________________________________

    -Zellaton Plural Evo speakers
    -Goldmund Telos 300 stereo amp
    -Goldmund Mimesis 37S Nextgen preamplifier
    -Doshi EVO and Goldmund PH3.8 phonostage
    -VPI Vanquish direct-drive turntable
    -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
    -Lyra Atlas SL Lambda, Fuuga Mk. 2, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
    -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
    -Assorted cables including Transparent XL Gen. 6, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords
    -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

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    • Dr.Ears
      Dr.Ears commented
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      N/A
      Last edited by Dr.Ears; 02-08-2018, 02:16 PM.

    • MylesBAstor
      MylesBAstor commented
      Editing a comment
      Agreed that can be one particular scenario. But some manufacturers, EAR and cj come to mind, design around the PC88 now. Definitely was worth a gamble when say the Tele PC88s were practically given away at $25/tube. But their availability and price went up as people found out about the tube.

      And you can have bad results too as I found out with the Bottlehead Repro. There Dan uses an old trick running the 6 V tube at a little lower voltage to lower noise. So using a 7 V tube really didn't work in this situation at all.

      One day will have to try a "real" Phillips PC88 in my preamplifier. The PC88s that cj uses are sourced from Kevin Deal and as best can figure out, are Phillips parts assembled in Yugoslavia eg. EI factory. But must be some real, earlier vintage Phillips PC88s around too.

  • #5
    Myles what brand tubes have you tried in your Amps ?what sounded best ? What output tubes does it use ?
    analog stuff.
    otari mtr 10 2 track 1/4 made new by soren
    otari mtr 10 2 track 1/4 1/2 combo made new by soren
    sota sapphire used eminent tech ver 2 arm
    new sota nova table has magnetic levitation platter and full speed control and latest motor same arm as above
    thorens td124 sme ver 2 arm
    thorens td125 sme ver 2 arm
    kenwood direct drive sme ver 2 arm
    phono preamp Ml no 25 all re capped
    speakers cust infinity IRS V , new caps and LPS , magnets etc.
    mark levivson pre no 26 amps no 33
    digital three cust servers , win ser 2016 , AO
    Dacs lampi various

    Comment


    • #6
      Originally posted by Alrainbow View Post
      Myles what brand tubes have you tried in your Amps ?what sounded best ? What output tubes does it use ?
      I am going with what cj supplied with the exception of the 6H30s. Per monoblock.

      8xKT120
      1x6H30-DR (NOS from BAT)
      1xMullard 6c4/8080
      Myles B. Astor, PhD, Administrator
      Senior Editor, Positive-Feedback.com
      ________________________________________

      -Zellaton Plural Evo speakers
      -Goldmund Telos 300 stereo amp
      -Goldmund Mimesis 37S Nextgen preamplifier
      -Doshi EVO and Goldmund PH3.8 phonostage
      -VPI Vanquish direct-drive turntable
      -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
      -Lyra Atlas SL Lambda, Fuuga Mk. 2, vdh Colibri Master Signature, MutechHayabusa, MOFI Master Tracker, Sumiko Songbird cartridges
      -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
      -Assorted cables including Transparent XL Gen. 6, Skogrand, Viero, Kubala-Sosna, Audience Au24SX, Genesis Advanced Technologies and Ensemble Power Cords
      -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.1+ platforms.

      Comment


      • #7
        Is that list for both Mono blocks dare I ask lol. ?..
        analog stuff.
        otari mtr 10 2 track 1/4 made new by soren
        otari mtr 10 2 track 1/4 1/2 combo made new by soren
        sota sapphire used eminent tech ver 2 arm
        new sota nova table has magnetic levitation platter and full speed control and latest motor same arm as above
        thorens td124 sme ver 2 arm
        thorens td125 sme ver 2 arm
        kenwood direct drive sme ver 2 arm
        phono preamp Ml no 25 all re capped
        speakers cust infinity IRS V , new caps and LPS , magnets etc.
        mark levivson pre no 26 amps no 33
        digital three cust servers , win ser 2016 , AO
        Dacs lampi various

        Comment


        • Dr.Ears
          Dr.Ears commented
          Editing a comment
          It cannot be Al, how can you split a single 6C4 between a pair of mono-blocks?

        • MylesBAstor
          MylesBAstor commented
          Editing a comment
          Sorry cleared up confusion.

      • #8
        Lol. Sorry
        analog stuff.
        otari mtr 10 2 track 1/4 made new by soren
        otari mtr 10 2 track 1/4 1/2 combo made new by soren
        sota sapphire used eminent tech ver 2 arm
        new sota nova table has magnetic levitation platter and full speed control and latest motor same arm as above
        thorens td124 sme ver 2 arm
        thorens td125 sme ver 2 arm
        kenwood direct drive sme ver 2 arm
        phono preamp Ml no 25 all re capped
        speakers cust infinity IRS V , new caps and LPS , magnets etc.
        mark levivson pre no 26 amps no 33
        digital three cust servers , win ser 2016 , AO
        Dacs lampi various

        Comment


        • #9
          So Dumb I need to not post when I am drinking lol.
          analog stuff.
          otari mtr 10 2 track 1/4 made new by soren
          otari mtr 10 2 track 1/4 1/2 combo made new by soren
          sota sapphire used eminent tech ver 2 arm
          new sota nova table has magnetic levitation platter and full speed control and latest motor same arm as above
          thorens td124 sme ver 2 arm
          thorens td125 sme ver 2 arm
          kenwood direct drive sme ver 2 arm
          phono preamp Ml no 25 all re capped
          speakers cust infinity IRS V , new caps and LPS , magnets etc.
          mark levivson pre no 26 amps no 33
          digital three cust servers , win ser 2016 , AO
          Dacs lampi various

          Comment


          • Dr.Ears
            Dr.Ears commented
            Editing a comment
            For me, it's the older I get, the more I realize how ignorant I really am!
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