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Thread: Any Attempt at a National/Valco/Supro Under-the-Bridge Pickup?

  1. #1

    Any Attempt at a National/Valco/Supro Under-the-Bridge Pickup?

    I've played with the idea over the years, but I've never actually seen one apart. Anybody ever attempt one or something similar? If so, any tips?

  2. #2
    Oops! Wrong pickup...
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Steve A.; 07-14-2018 at 08:00 PM.

  3. #3
    I recall that pickup, but the one I'm referring to is the "Silver Sound" pickup, often mistaken these days for a piezo bridge pickup. When in fact it's a magnetic pickup in the bridge. Patent found here. Looks like a couple small-ish identical hum cancelling coils mounted in the base, in series, with two rod magnets mounted in the saddle portion that extend down into the cores of the coils. I guess somewhat like a moving magnet design. I've heard them briefly a couple times decades ago, thought they were unusual. I recall seeing one with a clear plastic base, revealing to me at the time that it wasn't a piezo. I've been puzzled since then how any meaningful amount of volume could be had from such a passive configuration.

  4. #4
    Quote Originally Posted by Tim Escobedo View Post
    I recall that pickup, but the one I'm referring to is the "Silver Sound" pickup, often mistaken these days for a piezo bridge pickup. When in fact it's a magnetic pickup in the bridge. Patent found here. Looks like a couple small-ish identical hum cancelling coils mounted in the base, in series, with two rod magnets mounted in the saddle portion that extend down into the cores of the coils. I guess somewhat like a moving magnet design. I've heard them briefly a couple times decades ago, thought they were unusual. I recall seeing one with a clear plastic base, revealing to me at the time that it wasn't a piezo. I've been puzzled since then how any meaningful amount of volume could be had from such a passive configuration.
    Here is a smaller image for display...




    And here is a larger image for downloading, etc.

    Click image for larger version. 

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    I hope that might jog someone's memory banks!

    Steve A.

    P.S. Please check back and post whatever you find even if it is nothing in case this thread turns up later in a Google search. Thanks and good luck!

    P.P.S. Here is the attached PDF file of the patent for future reference...

    US2988946.pdf

    https://patents.google.com/patent/US2988946
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    Last edited by Steve A.; 07-14-2018 at 08:20 PM.

  5. #5
    Old Timer Possum's Avatar
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    I made a replica of one once. You have to build everything from scratch. It sounded pretty good, but the amount of time to make one isn't worth the effort. There was some company claiming to sell replicas, but inside the cover they were just a cheap P90. There is a thick piece of steel inside with a right angle bend to it that is hard to get without a huge press. Here's the patent....2,683,388
    http://www.SDpickups.com
    Stephens Design Pickups

  6. #6
    Senior Member LtKojak's Avatar
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    Quote Originally Posted by Possum View Post
    Here's the patent....2,683,388
    For the lazy googlers...

    https://patents.google.com/patent/US2683388

    You're welcome!
    Pepe aka Lt. Kojak
    Milano, Italy

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