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Um, the + side of the cap goes to ground. One of the 6AL5 cathodes (Pin 1) goes thru a 910 Ohm resistor to ground. Likewise, one 6AL5 plate (Pin 2) goes thru a 820 Ohm resistor to the - of the cap. This is a fairly normal ration detector circuit. It's worth checking out C7, because a surprising number of caps used in that application are found to be open. Basically, the FM sounds not quite right. The voltage developed across C7 is also used during the FM alignment...
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