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Hickok 799 Tube Tester

the "Mustang"

 

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alternate view 1

panel (original)

panel (modified)


pre-octal tube
adaptor panel
close-up

Hickok Mutual Conductance Tube tester model 799

Here's an unusual Hickok Mutual Conductance tube tester. It's laid out more like the B&K "Dyna-Quik" line of testers. Although it's promoted as a Mutual Conductance tester, it does not provide a true Gm scale or the ability to convert the reading to a Micromho reading. There are basically three test readings, one for rectifier tubes and two scales for Mutual Conductance (low Gm & high Gm. The low scale gives reading for tubes from 1000 - 5000 Gm. The high scale is 5000 - 20000 Gm. So what you get is basically a good-bad reading or it can be interpreted as a percentage of the expected Gm value of the tube under test. IE; full scale would equal 100%.

This tester originally would only test the more modern tubes and most all consumer tubes from the mid 1930s though the late 60s. It had a blank panel or the addition for an adaptor to test future newer tubes. Shortly afterwards, tubes use was on the way of the dinosaur with modern technology. My thinking was that this tester is just too nice to be limited to test only those tubes. So I decide to make use of the blank space and spent the better part of a week coming up with a modification so it could be made more useful. I have added a socket panel of my own creation so it will now test many of the early "big pin" (pre-octal) tubes. I have compiled a data chart for the most popular of those tubes. I know I cannot recover all the time spent doing this modification but my hope is that I can I'll be able to sell an info package so others can perform the same changes to their '799. 

 

        pre-octal tube adaptor panel
 MODIFICATION INFO as DESCRIBED ABOVE AVAILABLE>     Click HERE

< Instruction manuals and tube test set-up charts available for  the above and other models

 
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the instrument has been SOLD, photo reference only