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Heathkit TT-1
Tube Tester

 

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The Heathkit TT-1 is Heath's only  mutual conductance  tester and it's a beauty. It has several features not found on most Hickok testers such as; grid current & voltage regulator test. The two best features are: built in, easy to use calibrator and the ability to test dual triode tubes without changing the selector switches. This tester will test nearly all consumer tubes from the early 1920s - 1974 + some industrial & foreign tubes.

Note: the the TT-1A lid adaptor panel, an option.
 

< AVAILABLE, reprint Heathkit  manuals for above & other models

 

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the instrument has been SOLD, photo reference only