magnavox fm tuner wont tune below 93 mhz

[drh4683]

I have a 1963 magnavox am fm phono with color tv console. Everything works perfect (even the tv!!) except for the FM which works but has a problem. FM will not tune correctly below 93 mhz. It will almost be like a very strong station takes over between 93 and down past the end of the dial to 88 mhz. I receive 90.9 mhz way at the end (88), and it spreads up to 91 as if the AFC is on (which it is not). There are stations down at 88.3 that I cannot receive, even if I adjust the oscillator on the fm tuner. It is a "Gorler" brand tuner mounted on the magnavox receiver chassis. Not sure if the oscillator tube is the problem or what. Any help is greatly appreciated! Thanks-Doug