John - Thanks, I understand.
You just said a wealth of info in your second paragraph because that
is exactly what I have noticed. My 810 coil is working very good and
it's Q is way off by calculation. A fresh new old tube makes a world
of difference.... :)
Dave
On 1/18/2018 5:29 PM, Futuret via Tesla wrote:
Dave,
I used to know, but I can't remember. It's somewhere in my
hand-written notes. Maybe someone else will have the answer :-)
I may have gotten that from Ed Phillips originally. Not sure if
he's still on the list.
By the way in my tests, the primary Q didn't seem to make much
difference
if it was 10 or 20. I didn't see any difference in performance, maybe
because of the effect of the loading by the secondary and sparks.
John
-----Original Message-----
From: David <zipo@xxxxxxxxxxx>
To: tesla <tesla@xxxxxxxxxx>
Sent: Thu, Jan 18, 2018 5:08 pm
Subject: [TCML] Tube Q
I have been going over some of the math for my 810 tube coil and I have
a question for John.
John - You have been credited with multiplying plate current by a factor
of four for calculating tube impedance to be used for determining tank Q
(plate V/4*plate I). Why Four? as opposed to just plain (plate
V/plate I).
Thanks John and everyone
Dave
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