The TDA2822 power amplifier has a voltage gain of 100 which is plenty for a radio. It has a supply current drain of up to 1.2A. The 1.2A pulses cause the power supply voltage to sag and that is where the collector resistor of the transistor preamp (that is not needed) is connected.
I have seen high gain amplifiers vibrating ceramic coupling capacitors (that should not be used for coupling audio) which caused feedback.
Hey thanks audioguru. No, I did need a driver for the chip. Some signals are very weak in short-wave. I about got it. The chip seems to be prone toward low frequency oscillation. And...whenever a signal comes in above a certain level it starts picking up hum....probably the power wires hanging out everywhere. What I did was put some decoupling caps in the audio and a great big one (value) across the power source.
I tried using low value (.01uf coupling caps to emphasize the higher audio frequencies, but that chip make it's own low frequency. I swear. That's one reason I don't depend to heavily on IC's because you don't have the level of control you might like. But as far as putting out extreme audio power at now 5.6 volts. This guy does the job and more. I sould be able to button this thing up and cut off all the extra power leads and see how it actually performs.