Fedtro Vacuum Tube Tester to USB Conversion

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About: I love Technology with a passion its constantly changing on a daily basis. This phenomenon is so overlooked by the most of the world we use it on a daily and the majority of the world is completely oblivious...

Well, I basically took the tester and removed the battery spacers out that were obsolete

Due to the size of the battery which was slightly smaller by a 5th of it. I then took an old Phone usb and usb adapter charger and clipped the micro usb connection off exposing the internal wires I then soldered the negative to negative and positive to positive and ran several test to confirm if is usefulness it worked like a charm.

tested the tester by plugging it into the outlet and computers even my car and it worked :)

so here you go enjoy

a Fedtro Vacuum tube tester circa 1966

To USB Conversion.

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    14 Discussions

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    robot797

    3 years ago

    this isnt a real tube tester

    it is a fillament checker

    it checks the fillamtents

    XD

    11 replies
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    robot797Democon

    Reply 3 years ago

    i know but i like to warn people about it
    becaus i was fooled by it once (when i just started working with tubes)

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    Democonrobot797

    Reply 3 years ago

    To bad the technology is so great even at its age it is so much fun the image you have as your avatar what is that

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    robot797Democon

    Reply 3 years ago

    it is my firsth oscilloscope
    i got it for free from a co worker
    i had to dismantle it affter a year of service
    it stoped working

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    Democonrobot797

    Reply 3 years ago

    omg I would work on it if it was mine. I actually had a hughes mitchell VFO i purchased online circa 1939 it was pretty busted up but I fixed it up really nice bought it for 90 sold it for 200.

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    DemoconDemocon

    Reply 3 years ago

    is that a vintage oscilliscop? man its a beautiful piece

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    Democonrobot797

    Reply 3 years ago

    cant really tell without my glasses

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    BeachsideHankDemocon

    Reply 3 years ago

    You are both right to a certain degree, it is technically a filament continuity tester, the most likely part of a vacuum tube circuit to fail. More electronic circuitry is required to determine gain, leakage, and other useful information about a tube (valve for our Brit friends). My teenage buddy and I used to make these back in the '60's to test tubes from old television and radios we salvaged. For more comprehensive data, we would take them to a local food store which had the big console type tube tester that would check all parameters. I recall we used the venerable #47 6.3 volt mini- lamp as the indicator. That jeweled lens cap is a keeper, they don't make 'em like that any more.