My recollection is that you don't re-tweak the plate. The "slightly
over-coupling the loading capacitor" was meant to nudge the amp into a
slightly more linear portion of the curve than you get by the normal tuning
procedure. Since Class AB is not Class A the curve is not ruler flat.
At least, that's what I recall reading sometime in the past, probably on
this list.
Kimo Chun, KH7U
Date: Tue, 20 Dec 2011 08:04:16 -0500
From: Eddy Swynar <deswynar@xplornet.ca>
Subject: [Amps] Fwd: Linear Amplifier Tuning---PROPERLY!
To: amps@contesting.com
Hi Guys,
Obviously this is a VERY interesting question, & one which I really & truly
believe that not much thought is given to by the amplifier-using / designing
community, judging by the e-mails that I received...
I've received a total of FOUR responses re. the need / desirability (if any)
to "re-tweak" the plate tuning control after slightly over-coupling the
loading capacitor during the tune-up procedure. Of these four, I got the
distinct impression that two were rather non-committal at best, one stated
that the tuning capacitor should be re-peaked, and the fourth stated that
no, the advanced loading should be the final step...
Interesting! And I thought that I was the one who was confused! Hi Hi
~73~ de Eddy VE3CUI - VE3XZ
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