The transconductance of that tube is given in the original data sheet at
23mA/V, so the input impedance of a single tube will be 43 ohms.
A 2:1 transformer will match to 25 ohms.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Lee Buller
Sent: Sonntag, 14. März 2010 21:30
To: amps@contesting.com
Subject: [Amps] GI7B Question - Input Matching
I have been reading about the GI-7B Russian made tube. It seems that the
input impedance of two tubes is around 100 ohms. Could you not just use a
2:1 transformer to make a match from 50 ohms to 100 ohms? What am I missing
here.
Lee - K0WA
Ham Radio Operators: Kansas QSO Party is August 28-29, 2010. See
www.ksqsoparty.org for details
In our day and age it seems that Common Sense is in short supply. If you
don't have any Common Sense - get some Common Sense and use it. If you
can't find any Common Sense, ask for help from somebody who has some Common
Sense. Is Common Sense divine?
Common Sense is the image of the Creator expressing revealed truth in my
mind. - J. Wolf
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