How To Date 50w Plexis

Discussion in 'Let's Talk Vintage' started by Goldsmithmill, Jul 4, 2019.

  1. Goldsmithmill

    Goldsmithmill New Member

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    Nowadays it's no trouble to date a 100watter within months. For example:
    https://solodallas.com/the-evolution-of-the-100w-circuit-from-jtms-to-jmp-superleads
    But I can't find any information to date the 50watters in a similar way. Any suggestions?

     

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    Last edited: Jul 11, 2019
  2. ampmadscientist

    ampmadscientist Well-Known Member

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  3. Goldsmithmill

    Goldsmithmill New Member

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    The codes says 66 and 67. Is it possible to say that the amp is a early 68?
     
  4. nevermind

    nevermind Active Member

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    I think you could strike up a casual conversation and if the signs point towards acceptance, you could invite the Plexi out for a cup of coffee or perhaps an adult beverage.

    I'm not one to judge but wouldn't you really want to date a Supermodel? :agreed:
     
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  5. ampmadscientist

    ampmadscientist Well-Known Member

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    A 67 or 68 probably.
    You can see that the screen resistors were added and so I am leaning 67.
     
  6. Ned B

    Ned B Active Member

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    The Drake transformers don't have date codes this early. The mustard codes usually predate manufacture by months. The S/ vs S/A serial prefix is an indication of late '67 to early '68. The slotted turrets lead me to late '67. It's hard to pinpoint 50s from that era.
     
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  7. neikeel

    neikeel Well-Known Member

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    I posted in the images section
    It is typical late 67.
    The slightly longer solid board near the diode and the transformer types. Of course the choke is an early 70s type replacement.
    Quite a lot of parts in the board have been replaced, more than for simple servicing, so I guess some mods have been reversed (it had MV once (see new red wire on treble pot wiper).
    Date stamps did not appear on transformer bells until 73/73 AFAIK
     
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  8. chuckharmonjr

    chuckharmonjr Well-Known Member

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    Dinner and a movie usually works for me.
     
  9. JohnH

    JohnH Well-Known Member

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    Good point, and remember she's gonna be over 50 years old, and probably a bit beat up. But if you play her hard she can still scream like a bitch and purr like a kitten. Plus, if like me, you are pushing 60, she can still look gorgeous after a couple of beers.
     

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