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The 718 is an excellent AM rig after a few adjustments. Get inside and turn the modulation up and the carrier down. Run the audio into the accessory port in the back.
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A 9v battery hooked up as a Negative Voltage into the ALC port on the back of the radio, through a potentiometer.
One simple trick that works on many HF rigs, is injecting line level audio into the radios carrier or drive control circuit. If these are potentiometers, it's easy to inject through a coupling cap to block DC. If the audio lacks high frequency response, look for high value bypassing caps, shunting the audio to ground, and reduce their value so they are only effective at RF. ALC will still require adjustment to unlock this potential.
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