Currently Being ModeratedJul 25, 2012 5:06 AM (in response to knife)Re: Variax 700 Model Select Knob requires frequent re-calibration
The switch is a potentiometer. It's stepped to deliver different resistance values for each position on the selector. If the pot is dirty or worn, it will give a wrong resistance value and the guitar model selected will be "out".
Try this. Work the selector through its full range a dozen or so times. This might get rid of any dirt or corrosion in the pot. After doing that, recalibrate the selector.
If that doesn't work the selector pot may need to be replaced. Give it a go, good luck & let us know how it goes.