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Need help installing a new cabinet input jack

Discussion in 'Amps and Cabs [BG]' started by DaBassman, Feb 7, 2006.


  1. DaBassman

    DaBassman

    Mar 25, 2002
    Oneonta, NY
    Help
    Installing a new switchcraft L12A 1/4" input jack on back of old Fender Bassman cab.......Speaker has 2 wires (+/-) to attach to it....but jack has 3 prongs.....which 2 to use? And which is the + and which is the -??? Thanks
     
  2. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    Plug a 2-conductor plug into the 3-conductor jack, and you will be able to follow which contacts on the jack are connected to which positions on the plug. The + terminal on the speaker goes to the tip of the phone plug, the - terminal to the sleeve.
     
  3. DaBassman

    DaBassman

    Mar 25, 2002
    Oneonta, NY
    thanks, will give it a try!
     
  4. DaBassman

    DaBassman

    Mar 25, 2002
    Oneonta, NY
    Wow, I'm a little thick I guess! It's very difficult to see where the contacts lead..... l12a.jpg
    any suggestions?
     
  5. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    Gimme an hour, I will take a photo, and post here.
     
  6. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    You can see the lug that's attached to the ground/barrel; the other two are attached to the tip contact and a switching blade that contacts it, attach the positive lead from the drivers to both of those and you'll be OK.
     
  7. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    I found the following three plugs in my junk box. The first is a typical mono connector. The second is what your jack looks like, and the third is a stereo jack. In each case, I am showing the connections for use in a speaker cabinet.
     

    Attached Files:

  8. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    This is also true. Good advice.
     
  9. DaBassman

    DaBassman

    Mar 25, 2002
    Oneonta, NY
    Thanks, that looks like it. It's a Switchcraft L12A. I got it from ampwares



    they say it's the official replacement part for a Bassman cabinet.

    Thanks again