[AI2V]

One more important thing to note-  "moding" of the oscillator.  It's something you need an oscilloscope to see.  What it comes down to is a form of distortion that will change as you alter the frequency.   At one end of the dial the oscillator will be a sine wave but as you tune down, distortion begins and ultimately there is so much distortion that the counter will measure harmonic mixes.  Fixing "moding" is fairly easy by making sure the voltages are good  or the osc feedback may need to be increased/decreased.  Don't jump in and start tampering unless you've proven that your signal is distorted.