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Dating my Fender Bassman 135 head...

Discussion in 'Amps and Cabs [BG]' started by The 0x, Jan 5, 2004.

  1. The 0x

    The 0x

    Aug 24, 2003
    Timonium, MD
    How can I find out when my Bassman head was made? The serial number on the metal chassis is F121937. I can't find any other serial number. So when was it made? :confused:
    Smooth_bass88 likes this.
  2. http://www.ampwares.com/ffg/

    Bassman 135 (77-83)

    Some time between 1977 and 1983. If you can find some EIA numbers on the transformers or potentiometers you can probably date it more precisely, but it really doesn't make that big of a difference. Late 1970's or early 80's is all you really need to know.:D

  3. BillyB_from_LZ

    BillyB_from_LZ Supporting Member

    Sep 7, 2000
    On the endbells of the power or output transformer or the power supply choke, you'll see a number that will probably look like 606 YYWW (where the YY and WW are numbers). The 606 means Schumacher Electric Co., the next two digits should be the last two digits of the year (77 - 83 I suppose) and the last two will be the week (01 - 52).

    If the numbers on the three iron core components are close to one another, you know that the amp was made sometime after that.

    Like Throbbinut mentioned, controls will be date coded too as will the big electrolytic caps under the can. If you look under there...DON'T TOUCH ANYTHING METAL!!!!
  4. bassmantele


    Jul 22, 2003
    Boston MA USA
  5. The 0x

    The 0x

    Aug 24, 2003
    Timonium, MD
    I'll believe you, but just curious, how did you find that out? :confused:
  6. Rockbobmel

    Rockbobmel Supporting Member

    Ican't figure mine out.: FENDER, then below that: 013691, then below that: LIA606-139
  7. bassmantele


    Jul 22, 2003
    Boston MA USA

    For mid to late '70s silverface amps and early '80s "blackface" models, the serial numbers are date encoded much the same way as Fender guitars from the late '70s:

    A6 + 5-digits - 1976
    A7 + 5-digits - 1977
    A8 + 5-digits - 1978
    A9 + 5-digits - 1979

    B + 5-digits - 1975, 1976

    F0 + 5-digits - 1980
    F1 + 5-digits - 1981
    F2 + 5-digits - 1982
    F3 + 5-digits - 1983
    F4 + 5-digits - 1984
    F9 + 5-digits - 1979, 1980

  8. magnus90


    Dec 21, 2007
    Tallinn, Estonia
    The serial on the chassis is A01456. Can't find the year. It's a Fender Bassman 100 (silverface). Can anyone help me?

  9. johnk_10

    johnk_10 vintage bass nut Supporting Member Commercial User

    Feb 16, 2008
    Thousand Oaks, CA
    John K Custom Basses
    when dating, i'd recommend taking it to dinner and a movie before turning it on. ;)

    ..................but seriously, the filter caps, transformers and pots will have date codes that will give you a very close approximation as to when it was made.

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