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The waveform at the horizontal output tube on these sets is essentially a sawtooth; there should be no problem getting a stable reading (unless you're overloading the freq. counter as it's about 40V P-P). Assuming you have already replaced the wax-covered and molded striped capacitors, you may have a resistor (or several) that have drifted out of spec. One more thing: Make sure to use a plastic film capacitor across the synchroguide coil (the one you use to adjust horizontal frequency). I found out the hard way that using a ceramic causes serious frequency drift.
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Erich Loepke
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