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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.

<p>this isnt a real tube tester</p><p>it is a fillament checker</p><p>it checks the fillamtents</p><p>XD</p>
<h3><a href="https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCEQFjAAahUKEwiF_t34k8bIAhUBWx4KHfnpBkU&url=http%3A%2F%2Fwww.ebay.com%2Fitm%2FSenco-Filament-Checker-Tube-Tester-%2F201396001085&usg=AFQjCNHAKny96xHDCMfxPL-oQC_t0yUswA&sig2=tX4FupsZwxqv-KY5D5im2Q" rel="nofollow">Filament Checker Tube Tester </a></h3><h3> Tester is commonly used including by the maker so yes its a tester maybe not the tester you want it to be but it is a tester. :) thank you</h3>
i know but i like to warn people about it<br>becaus i was fooled by it once (when i just started working with tubes)
<p>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</p>
<p>it is my firsth oscilloscope<br>i got it for free from a co worker<br>i had to dismantle it affter a year of service<br>it stoped working</p>
<p>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.</p>
<p>is that a vintage oscilliscop? man its a beautiful piece</p>
<p>realy</p><p>you think that</p>
<p>cant really tell without my glasses</p>
<p>ah that explains</p>
<p>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.</p>
<p>Thanks for sharing :)</p>
<p>Nice fix. Thanks for sharing!</p>
<p>your very are welcome. </p>

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