When you say using any other AMP, what are those amps? Are they also Solid State? Tube amps can go pretty much thru anything without obvious happenings, Solid State not so much. The LA1K is very touchy to issues with its protection.
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You say no Dummy Load? That’s not going to help narrow it down.
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Are you using the latest firmware? If not DL it from website.
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Without a dummy load its going to be difficult to determine if it’s the amp, radio, cable, antenna.
