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Boat anchors: T.M.C. GPR-90 , Johnson Pacemaker, Heathkit DX100

Discussion in 'Amateur Radio Gear Swapshop' started by 357, Oct 30, 2018.

  1. 357

    357 Walkin' the dog

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    Just got these in the door, gonna have a heart attack. Frigging heavy rigs.
    I will post pics soon.



    Anyone interested let me know.
    They are in good-very good condition and in a working state.

    T.M.C. GPR-90 , Johnson Pacemaker, Heathkit DX100
     
    #1 357, Oct 30, 2018
    Last edited: Oct 31, 2018

  2. 357

    357 Walkin' the dog

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    IMG_3510.JPG IMG_3511.JPG IMG_3512.JPG IMG_3513.JPG IMG_3514.JPG IMG_3515.JPG IMG_3516.JPG IMG_3518.JPG IMG_3510.JPG IMG_3511.JPG IMG_3512.JPG IMG_3513.JPG IMG_3514.JPG IMG_3515.JPG IMG_3516.JPG
     
    #2 357, Oct 31, 2018
    Last edited: Oct 31, 2018
    Shadetree Mechanic likes this.
  3. 357

    357 Walkin' the dog

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  4. 357

    357 Walkin' the dog

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    I aint lugging the dx100 upstairs till tomorrow.
    Theres 2 of them.:sick:
     
  5. 357

    357 Walkin' the dog

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    IMG_3519.JPG IMG_3520.JPG IMG_3521.JPG IMG_3522.JPG IMG_3523.JPG IMG_3524.JPG IMG_3525.JPG IMG_3526.JPG IMG_3527.JPG
     
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  6. 357

    357 Walkin' the dog

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    IMG_3528.JPG IMG_3529.JPG IMG_3530.JPG IMG_3531.JPG IMG_3532.JPG IMG_3533.JPG IMG_3534.JPG IMG_3535.JPG
     
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  7. 357

    357 Walkin' the dog

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    1 DX100 is a parts rig.
    The pacemaker and the other DX100 look complete.
    Looks like 2 6146's each.
     
  8. 357

    357 Walkin' the dog

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    The pacemaker appears to have 2 6146's in it and aftermarket solid state rectifiers.

    IMG_3551.JPG IMG_3553.JPG IMG_3554.JPG IMG_3555.JPG IMG_3556.JPG
     
    #8 357, Nov 1, 2018
    Last edited: Nov 2, 2018
  9. 357

    357 Walkin' the dog

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    IMG_3595.JPG IMG_3589.JPG IMG_3590.JPG IMG_3594.JPG
     
    Shadetree Mechanic likes this.
  10. sunbulls

    sunbulls Well-Known Member

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    I’d love to have the DX100, but space is limited. Those home brew rectifier replacements with the top hat diodes were probably made in the late 50’s or 60’s. Since those became obsolete, better diode choices are available, but you can’t discount the visual appearance of the old school top hat.
     
    357 likes this.
  11. Radio Tech

    Radio Tech Radio Operator

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    I have been wanting to find a DX-100 for a long time. Get many request on YouTube to do a restoration on one. Problem is who can afford the shipping
     
    357 likes this.
  12. BJ radionut

    BJ radionut Supporting Member and 6m addict

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    The Pacemaker was meant as a multimode Ranger, but was a short lived disaster. If you are looking for an AM exciter, skip this one!
    If you wish to verify my assessment of the Pacemaker, set it to transmit on 21.0 MHz and listen to the awful birdie that comes out along with the desired signal. Rock the VFO back and forth to be sure you are listening to both of the signals. There are lots of decent fun legacy SSB radios to play with that will not get you an OO report or a QSL card from the FCC. Avoid this one.
    Info above copied de:
    http://wireless-girl.com/Projects/AMTransmitters/JohnsonPacemaker.html

    Unfortunately the Pacemaker, while made by one of the Best...E.F. Johnson was not their greatest achievement...Though sought after by some collectors, more of a display to collections than a widely used Transmitter.
    Whether a transmitter is "a good one to restore" depends on what you want to do with it after it is restored.
    The Pacemaker was Viking's first SSB transmitter and has a single 6146 for a final. So the INPUT power is 90 watts SSB and CW and 35 watts AM.
    The output will be maybe 50 watts which is enough to use barefoot or with an amplifier on SSB and CW.
    On AM its power is not much particularly with the bands in the shape they are now.
    GL
    All the Best
    Gary

    Model: Pacemaker - Johnson Company, E.F.; Waseca,
    Material Metal case
    Shape Tablemodel, low profile (big size).
    Dimensions (WHD) 21 x 11.6 x 16.6 inch
    Notes AM/CW/SSB transmitter for 80-10 m amateur bands. 35/90/90 watts input.
    Net weight
    73 lb 12.6 oz (73.789 lb)
     
    357 likes this.
  13. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    74 lbs. Wow.
     
    357 likes this.
  14. 357

    357 Walkin' the dog

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    This one has many mods, maybe fixing the birdies?
    L8 is shielded with plexiglass, T1 audio transformer is replaced with that gray round one and this unit has 2 final tubes in it.
    Maybe someone made it work better than when it left the factory?

    Wireless girl isn't the world expert on johnsons is he?
     
  15. 357

    357 Walkin' the dog

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    it would have to be pro-packed in a crate.
    I wont ship this unless its bomb-proof and a cardboard box will not cut it.
     
    Shadetree Mechanic likes this.

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