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Mallory date code ?

Discussion in 'Electronic Repair' started by Henry Kolesnik, Sep 22, 2008.

  1. Does anyone know the date codes that Mallory uses on their electrolytic
    caps a 1900ufd at 450v? Here's a couple of lines..
    CGS192T450X5L3PH
    235-8112K
    Thanks
     
  2. junebug1701

    junebug1701 Guest

    If I'd have to guess, Hank, I would say that cap was made in the 12th
    week of 1981. That's according to the last 4 digits.

    James
     
  3. Franc Zabkar

    Franc Zabkar Guest

    I have three screw terminal Mallory caps with the following markings:

    MALLORY
    MADE IN U.S.A
    TYPE CGS
    30000MFD 15VDC
    POS + 85C
    MAX SURGE 20VDC
    95661319
    235-8102K

    MALLORY
    MADE IN U.S.A
    TYPE CGS
    29000MFD 15VDC
    POS + 85C
    MAX SURGE 30VDC
    CGS293U025R4C3PH
    235-8532K

    MALLORY
    MADE IN U.S.A
    TYPE CGS
    21000MFD 16 VDC
    POS + 85C
    MAX SURGE 20 VDC
    CGS213U016R3L
    362 8906 56699

    They all date from around the early 80s.

    Here they are pictured among Sprague caps of the same vintage:
    http://www.users.on.net/~fzabkar/screwcaps70.jpg

    I'd say that 8112 is a YYWW date code.

    - Franc Zabkar
     
  4. Franc Zabkar

    Franc Zabkar Guest

    Then how do you account for the "32" in "235-8532K"?

    Here are two more caps, with date codes of 7945 and 8102:

    MALLORY
    MADE IN U.S.A
    CGS591T200R3C3PL
    590MFD 200VDC
    POS + 85C
    MAX SURGE 250VDC
    1014861-00
    235-7945K

    MALLORY
    BIONOL
    CAPACITOR
    6MFD
    660 VAC
    60 HZ NO PCBS
    95686701
    37NB6606
    PROTECTED
    C 200 AFC
    64591 PTD
    8102-1

    - Franc Zabkar
     
  5. Syl

    Syl Guest

    Franc Zabkar a écrit :
    It IS YYWW (that is year and week)
    so....235-8532 means 1985, 32nd week. That is why the K is there...

    Syl
     
  6. John Byrns

    John Byrns Guest

    I agree that it is YYWW, but I don't understand what you are saying the reason
    is that the "K" is there? Why is the "K" there?

    --
    Regards,

    John Byrns

    Surf my web pages at, http://fmamradios.com/
     
  7. Syl

    Syl Guest

    weeK, to avoid any possible confusion to the date format used.

    Syl
     
  8. VZ/res0zhra

    VZ/res0zhra Guest


    I have two that have the code 235-6039H. Looks like the 39th weeH of 1960.
     
  9. John Byrns

    John Byrns Guest

    That's where I figured you were headed with the "K", but typically the YYWW date
    code, as used on semiconductors for example, is used without a format indicator,
    in fact IIRC some versions of the YYWW date code scramble the digits in one way
    or another to obscure their meaning.

    I wonder if the "K" might not have another meaning, such as a code to indicate
    which of several factories the device was produced in? If that is the case, the
    fact that "K" is the last letter in "week" might just be a coincidence.

    --
    Regards,

    John Byrns

    Surf my web pages at, http://fmamradios.com/
     
  10. Guest

    I'm pretty sure it is a coincidence. I have only ever seen such indication
    on some Philips equipment where the letters KW (kalenderweek,
    kalenderwoche) are printed in front of a 3 or 4 digit code. Every single
    other piece of equipment I ever saw with such a code only has letters with
    another meaning in front of or after the date code.
     
  11. Syl

    Syl Guest

    John Byrns a écrit :
    Could well be but so far only found K and was told so.

    I was also told the first 3 digits where the factory ID,
    can anyone confirm this?

    Q: to OP. What country of origin is the cap from?
    Could it be a code for country of origin? Like Canada, US...

    Syl
     
  12. raypsi

    raypsi Guest

     
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