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That's interesting. My friend is the original owner of this four-watt dead-key TRC 447 and the cover has never been removed and it works great. We do not have any knowledge with radios / electronics.

 We can connect it to a two-pill or ten-pill and see what happens because he would like to use it for DXng but on AM only because both amps do not have the SSB delay. Would a four-watt dead-key drive the ten-pill?