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Found NOS 12AX7

Discussion in 'Glowing Bottle Tube Amp Forum' started by golfnut, May 7, 2020.

  1. golfnut

    golfnut Friend of Leo's

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    So I bought a used Kingsley Minstrel v3 from someone off another forum. I've had it about a week but decided to open it up today as the seller told me he forgot to check what was in it before shipping and there might be an NOS tube in it.
    Sure enough tube is labelled "England 12AX7 Westinghouse".
    I'm wondering if this tube would be better utilized in my Tone King amp or should I just leave it where it is. The pedal sounds great but would it really change it much if I put one of the TADS in it from the Tone King?
     
  2. 985plowboy

    985plowboy Friend of Leo's

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    I don’t think you have to bias that particular tube, do you?

    If not, I’d swap em and and report the findings here.

    Hang on a bit and folks who know more than me will weigh in.
     
  3. golfnut

    golfnut Friend of Leo's

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    As far as I know you'd only have to bias for power tubes with a fixed bias amp.
    My amp is cathode bias.
     
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  4. dan40

    dan40 Friend of Leo's

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    No need to bias a 12ax7 in that application.
     
  5. LPTyler

    LPTyler Tele-Meister

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    I got some vintage RCA 12ax7 tunes and put one in my Milkman amp and it made enough difference that my wife noticed. I would highly recommend it in the amp
     
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  6. Wally

    Wally Telefied Ad Free Member

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    UOS...not NOS. If it is in a circuit, it is a used tube. Since it is in a pedal and perhaps being used at low voltage, it might be ‘as new’, but NOS it cannot be.
    Would I want it in an amp rather than a pedal? Probably...but that choice would be made based on Sonic results.
    Got a picture or two of the tube? Featuring the codes if any are present?
     
  7. Paul G.

    Paul G. Friend of Leo's

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    It's not hard to swap it into the amp, so why not give it a whack? If you hear a difference, and you like it, you win. If not, no harm done.
     
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  8. slider313

    slider313 Tele-Afflicted Silver Supporter

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    FYI: Most, if not all, tubes labeled "England" are NOT made in England. Mullard, Brimar and Genelex were all labeled "Great Britain."

    Years ago I bought a sleeve of RCA 12ax7 that were labeled England and were actually EI's made in Yugoslavia. I believe that's what you have.
     
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  9. golfnut

    golfnut Friend of Leo's

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    Yes I read that.
     
  10. Wally

    Wally Telefied Ad Free Member

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    ^^^^^^which is why I asked for pics if available.
     
  11. golfnut

    golfnut Friend of Leo's

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    Yes as soon as I get home I will open it up and take pictures.
     
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  12. slider313

    slider313 Tele-Afflicted Silver Supporter

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    EI 12ax7/ECC83's' have smooth plates, a large ring getter, round mica spacers and a seam on the top of the tube (like a Philips made tube). They do sound good if you get one that isn't microphonic, which many are.

    [​IMG]
     
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  13. golfnut

    golfnut Friend of Leo's

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    Finally got around to opening up the pedal and taking a pic of the tube.

    [​IMG]

    [​IMG]
     
  14. Cali Dude

    Cali Dude Tele-Afflicted

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    That's very cool. I just ordered some NOS E I tubes myself. I also intend to put them into a tone king Gremlin (in place of the TAD 12ax7a-c) tubes that came with the amp. I am curious to see if it turns this already great amp into something even more special.
     
  15. uriah1

    uriah1 Telefied Gold Supporter

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    Nice rugged one.
    Cant tell if short plate or long plate.
     
  16. Andy ZZ

    Andy ZZ TDPRI Member

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    That is, I believe, considered a long plate design. Or at least mid-long.
     
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  17. Geo

    Geo Poster Extraordinaire

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    Westinghouse bought their 12ax7 tubes from different manufacturers. I have a couple with
    "Made in England" that also have the Soviet star on them. :rolleyes:

    If made by Mullard said to have the factory code etched into the tube glass.
    Also said Westinghouse relabeled Yugo EI or Tungsram tubes. There was a lot of fake
    COA branding done in the cold war era on non US tubes since the US would not buy
    from Russia but then in the late '70s US tube manufacturing was shutting or sold to
    off shore companies so between a rock and a hard place.
     
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