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The oscillator will double trigger and cause a jumbly picture if the stab coil is mistuned. Short it out then tune the oscillator to the correct frequency. Then we can fix the stab coil tuning. Or decide whether to again use it as it is not very necessary and may offer improvement if you leave it shorted.
Synchroguide sets were notorious for top of picture hooking when playing a non-timebase corrected VHS to it. Leaving the stab coil shorted may offer some improvement.
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