I have a couple suggestions for you. The unit has probably gotten oxidized controls from age. Any thing with rotating contacts over a period of time will get dirty. You need to purchase some contact cleaner (Read info on the can that it is safe for plastics) and flush the squelch and volume controls. You may also have to open the unit and identify what they call 'pots' or little trimmers to clean and adjust. Set your squelch control at mid range and with an insulated tool turn the pots a little in both directions and return it to original the positon. This will clean the control and when you find the one that effects your squelch it may have drifted and need to be readjusted until you have better control on the front knob.
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