The original datasheet says S=23mA/V +/- 3mA/V, therefore two tubes should
have an input resistance of 19-25 ohm in grounded grid
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Johnnie Walker
Sent: Montag, 26. Januar 2009 03:03
To: amps@contesting.com
Subject: [Amps] Input Z for 2xGI7b
Gentlemen,
What's the concensus on the input resistance of a pair of GI7b?
For the resistive component, I've seen numbers in quite a wide range - from
30-145 ohms. That's quite a spread!
I was hoping that the range could be nailed down more closely for the design
of the input matching network. Perhaps someone out there has been there,
done that.
Thanks!
73/jeff/ac0c
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