Preamp Tubes Gurus! Help Me Determine What I Have?

Discussion in 'The Workbench' started by ledvedder, Jan 11, 2019.

  1. ledvedder

    ledvedder Active Member

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    Wondering if any tube gurus can help me understand what I have here and if I should be using any of these, instead of leaving them collect dust in a box.
    Here are what the tubes are labeled and how many I have -
    China 12ax7b - 2
    Unlabeled - 4 (I think these are JJ)
    Sovtek 12ax7lps - 1
    6N4 - 1
    Ruby 12ax7ac7 HG - 1
    Jan 12at7 - 1
    Groove Tubes GT7025 - 1
    Groove Tubes 12ax7c - 1
    JJ ecc82 - 1
    Mullard 12ax7 - 1
    JJ ecc803s - 1
    JJ 5751 - 2
    Ruby 12ax7ac5 - 1
    Marshall VLVE-00040 - 1
    JJ ecc803s - 1
    ARS 12ax7a - 1
    RFT ecc83 - 1
    Tesla e83cc 32sr - 1
     
  2. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    JAN = joint army/navy (military spec) lots of brands mfgr'd military tubes.
    RFT = German
    Tesla, depending on age, could either be a JJ, or an older nicer tube.

    everything else is pretty standard, depending on age. Mullard, if original could be good. The RI's aren't anything like the old one & are just run of the mill Russian.

    Best bet, is to try them out.

    12AX7/ECC83 & 7025 are going to be your most robust tubes.
    5751, AT & AU 7 will be weaker tubes.

    Tesla:
    http://www.nosvacuumtubes.net/product/tesla-e83cc/

    You'd be best to post some images...
     
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  3. Gutch220

    Gutch220 Active Member

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    you have lots of single tubes (only one). if i were you i'd just keep them and experiment with different tubes at times
     
  4. pedecamp

    pedecamp Well-Known Member

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    Thats quite a collection, did you inherit them all or did you buy them one at a time through the years? Im no tube guy, I went through a bunch of tubes when I first got into tube amps 10 years ago but my eventual conclusion is that tube rolling is hair splitting and those tonal changes mostly can be gotten with the twist of your EQ on your amp, no need to stack up on tons of different tubes and NOS tubes. I say since you have them keep them as spares, roll them through your favorite amp and catalogue what they actually do for it for future reference when you need to use them.
     
  5. ledvedder

    ledvedder Active Member

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    I've just gotten them through the years. Either bought them or got them out of old amps I've had. My 2 main goals are 1) Try to get quieter tubes in my 51510 III, because the stock ones are quite noisy, and 2) See if I'm sitting on anything worth decent money.
     
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  6. charveldan

    charveldan Well-Known Member

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    You have a bunch of junk.
     
  7. pedecamp

    pedecamp Well-Known Member

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    Cut to the chase and talk to a couple tube suppliers, they will tell you exactly what you need. See what everybody says and order tubes from whoever seems to make the most sense.
     
  8. Dogs of Doom

    Dogs of Doom Moderator Staff Member

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    that's not really productive...
     
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  9. charveldan

    charveldan Well-Known Member

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    Fixed.
     

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