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My 6400M cutting out on tx with amp connected

jim
jim Member ✭
in FLEX-6000 Signature Series
Hi folks, I have a 6400M running to a resonant dipole about 40' up, powering through an ACOM 1500 Linear amp and a Palstar HF-Auto tuner. This is a new issue. Radio runs fine at 100W without the amp. Once I connect amp 6400m shuts down. I've checked power from the DM-330MV Alinco supply and no issues, I've changed out amps (tried both my Al-80B's- no luck- still shuts down), I've checked all patch cables. SWR is showing 1.02 to 1.05 at tuner. running version 4.0.1 on flex. I also have another 6400M and same issue. (runs fine at 100W but shuts down once amp is keyed). I have ferrites on most cables. Also have an MFJ 915 1:1 Current Balun on feed line to antenna.

Can't figure it out. Any ideas or suggestions?

Thanks
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