My 422 Centurion manual has very adequate instructions for tuning, and that is
what I go by.
Best regards - Bry Carling
> On Mar 2, 2014, at 12:38 PM, JAMES HANLON <knjhanlon@msn.com> wrote:
>
> On the question of tuning for Dip versus tuning for maximum output, let me
> offer a few words of, I hope, wisdom.
>
> First, the additional amount of power output that might be obtained by
> operating the rig "off dip" is so little that it will make absolutely no
> difference at the receiving end.
>
> Second, you are very likely increasing the total amount of power dissipated
> in the final amplifier tubes by operating "off dip," and you are pulling more
> current from the tube cathodes as well. Both will contribute to degrading
> the amplifier tubes' life. Considering what replacement tubes cost these
> days, you probably don't want to shorten the life of your existing tubes in
> order to get a few watts more output from them.
>
> You would probably be better advised to run the amplifier at somewhat less
> than full, ICAS class C ratings, that is to back off the fully loaded plate
> current a bit. You would lose at most one or two dB on the other fellow's
> S-meter, and you would add considerably to the life of your tubes.
>
> Jim Hanlon, W8KGI
>
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