03-26-2013, 09:44 PM
At the input of the pi network, you'll see a "dirty" audio signal. It will still likely have some RF (455 KHz) in it. But, you should see some audio there. Since those micas are an easy 100pf value, I would just go ahead and replace them and the resistor (50K 1/4 watt would be fine). If you need them, I can send you a couple nice little 100pf disc caps.