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Vintage Heathkit Thumb Tach Model GD-69, US $110 – Picture 0
Vintage Heathkit Thumb Tach Model GD-69, US $110 – Picture 0

Vintage Heathkit Thumb Tach Model Gd-69

US $110

  • Essex, Vermont, United States
  • May 27th
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Heathkit Thumb Tach Model GD-69 Purchase around May 2, 1969     This kit comes in its original box with the original manual and even the warranty card dated February 1969.  All pull out pages in the manual are intact.  Great condition.  Pages obviously have some sign of age and a few pen marks, but all pages are there and in good condition. The Heathkit Model GD-69 Thumb Tach is a compact Tachometer designed to measure the rpm of model engines. Engine rpm can now be checked easily and quickly without the need of the Tachometer touching or being physically connected to the engine. Variation in light intensity are picked up by a photo resistor in the Tachometer.  These light variations are converted into electrical impulses, and the resultant rpm can be read directly on the meter’s two ranges 0 to 5,000 rpm, or 0 to 25,000rpm.  All solid-state circuitry and a single circuit board make the Tachometer easy to assemble.  A Zener diode is used to regulate the meter circuit voltage and precision resistors keep the Tachometer ranges accurate. The metal cabinet has a tough, blue wrinkle finish that is scratch resistant.  A handy, pull out stand leaves both hands free to make engine adjustments. The Tachometer will be very useful in enabling you to select the proper propellers, fuels, glo-plugs, and needle value settings to obtain peak performance from your engine. 9 volt transistor battery (NEDA type #1604) is required to operate the Tachometer.       

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