It's usually the one closest to tuning. I believe SVR502 is adjustable resistor for FM stereo
Thanks bill, there are 3 VR's on this board labelled
1. FM TUN/ADJ - nearest to the tuner dial.
2. SEP ADJ - just under the mode switch for radio.
3. 19KHZ ADJ - down in bottom right.
Unfortunately no dice adjusting :annoyed: