Hello- All of my requests for commentary were for 6C4 use in the R-390A. I do recall seeing the warning in the R-390 (non-A) manual stating to not use the 6C4W types. In my mind I was thinking it may have to do with series-string filament concerns in the R-390. But I never investigated the reason for the warning. Thanks all,Byron W5FH ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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