This sometimes happens when a RF generator is connected to the mixer grid. But a problem ... I use my Knight-Kit GD-30 grid dip meter to test crystals. I built an adapter for ... crystal oscillator. This is one of it's uses as explained in the manual.
DOWNLOAD: https://tinurli.com/2f1kba
DOWNLOAD: https://tinurli.com/2f1kba
Knight kit grid dip meter manual
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