And that used to be the challenge that was a large part of the fun of using the AM mode. Just plain ole operating any mode can become boring after awhile. It was the constant tweaking of the easy-to-access circuitry of the plethora of medium power transmitters that used to be available and cheap. Although still heard at times, the DX-100s, Apaches, Viking Valiants, etc., have seemed to become more of a rarity on the air these days. Nowadays those transmitters are coveted more by collectors who sometimes reverse the hi-fi mods done just a few decades back to make them original. And then they sit quietly in shacks on display.