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I hate to disagree with anyone who has a kilowatt but this is plain incorrect.


Some military and marine rigs use one sideband with carrier. Almost all riceboxes use double sideband in the AM mode. There are only a few exceptions. The AM produced by a properly setup ricebox is AM just like an 807 modulated by a pair of 6L6s with. It is indistinguishable on a scope showing an envelope pattern. 


One sideband with carrier will not produce low distortion with the diode detector used in 98% of hammy receivers.


Warmed over riceboxes are among the best sounding and least distorted AM transmitters in the Northeastern U.S.