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Is that a low capacitance scope probe? If not, it may be pulling the tank freq down too much. To minimize loading, you could add a small cap in series with the probe. Just a 'gimmick' consisting of a few inches of wire twisted together should do it.
If you need to raise the freq, try a lower value tank cap. Maybe 100 pf to start, and see which direction you have to go from there.
Last edited by old_coot88; 04-11-2015 at 05:08 PM.
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