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2200 mfd is a lot in this location. I recommend about a thousand mfd. With the cap as large as it is now, you are passing a lot of low frequency response that can cause the modulator chip to draw excessive current. Some chassis will cause the eight volt regulator to drop out of regulation and mess the PLL circuit up. When this happens the symptom is very garbled AM audio. I've noticed the newer the radio is, the more sensitive it can be to this problem.