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Yea a 10 watt dead key for a Texas Star 350 is mucho grande too hi. Remember most cb amplifiers have HD stamped on them so they sell better. If you have a decent watt meter what is your dead key out from the amp when wide open? It should be say in the 50-80 watt range. You might want to run the radio closer to a 2 watt dead key input.

Also on AM you should be able to key the amp (or trigger it as you put it) with as little as 1/2 of a watt.