|[AMRadio] You Won't Believe This|
John Coleman, ARS WA5BXO
wa5bxo at pctechref.com
Sun Jan 2 18:45:30 EST 2005
What your speaking of Don is shown in the following article.
This article was started some time ago, for what reason I don't
remember. I never had the chance to spend a lot of time with it so it
probably has a lot of mistakes. If anyone wishes to help with the
editing or add on something else please do so, mail it to me, and I will
of course put your name on it.
Another one, on SWR, I found that I forgot about is at
I think "BACON" had some input on this one but I'm sorry Bacon I can't
remember for sure. It's another one that probably needs some help.
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Donald Chester
Sent: Sunday, January 02, 2005 5:11 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] You Won't Believe This
>If you measure current from the filament transformer center tap to
>you'll have not only cathode current, but plate current, as well. Just
>over at the grid current meter, subtract that from the plate meter, and
>your plate current, AND it's in a nearly ground potential position in
Return the grid leak resistor and/or PA bias supply to filament xfmr ct.
instead of to ground, and your meter will read true plate current. If
a screen grid tube, return the negative lead of the screen supply to
filament ct. as well.
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