Are we speaking of Class C amplifiers or linear amplifiers operating in
Class AB1 or Class AB2? In a Class C amplifier the input power or grid
drive does not appear as part of the output power. In a grounded grid
linear amplifer the input or drive power does appear as part of the output
power. There is a difference.
73
Bob, K4TAX
----- Original Message -----
From: "Brian Carling" <bcarling@cfl.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, March 02, 2014 11:40 AM
Subject: Re: [TenTec] Re(Ten Tec) In praise of older technology
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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