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.
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.
The adaptor, which includes more tube sockets and convenient pin straighteners.
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.
An interesting note "d" in the chart for most rectifiers, says that the best test is in circuit.
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