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TOOB CARE

5/28/2015

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Watch Your plate current.

Take care in bias settings.

And don't run your filaments too HOT!
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I think it still has vacuum - or at least it did for a while.
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OLIVE DRAB

5/27/2015

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Hickok I-177, Military Tube Tester from 1953

Predecessor to the ever popular TV-7, this is a VERY tough, compact unit - until you add the adaptor for more "modern" tubes.. It has a switchable GM value function.

It came complete with instructions and a tube testing chart which lacks any GM (mutual conductance) values. This may have been intentional to simplify testing. The instructions give the parameters for the pass/fail (red/green) tests.. I suspect the GM settings were covered in a more comprehensive manual which was not included in this set.

All of the interior components and wiring were treated for fungus resistance. The benefit of this, beyond the lack of any moldy smell, was to preserve the components in a nearly new condition including the wire colors.
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The adaptor, which includes more tube sockets and convenient pin straighteners.
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The tester seems to give results nearly consistent with my Hickok 600. It's shortcoming is a lack of any adjustments for calibration.

An interesting note "d" in the chart for most rectifiers, says that the best test is in circuit.
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    Author

                         Russ Webb

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    Russ Webb & Fuzzy

    Best Buddy, Radio fixer







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CUSTOM DESIGN BY SUE WEBB  06/2013       Redesigned by Russ Webb     Approved by Fuzzy   Updated:  Pretty much all the time, but I forget to change this date
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Photos used under Creative Commons from valart2008, rafeejewell