[Amps] Fwd: Linear Amplifier Tuning---PROPERLY!

[Kimo Chun]

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 at xplornet.ca>

Subject: [Amps] Fwd: Linear Amplifier Tuning---PROPERLY!

To: amps at 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