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Even though they put HD on them, that don't always mean that you can have a high dead key, usually they are referring to the swing.  You can have a higher swing on AM than the normal 10-15 watts like a regular cb.  If you look up the amp on the Texas Star website, it should let you know what the dead key should be and what your max swing should be. If you keep your dead key down and the swing just under what they say max is, that amp should last you a long time.....