[Amps] Input Z for 2xGI7b

[Peter Voelpel]

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 at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Johnnie Walker
Sent: Montag, 26. Januar 2009 03:03
To: amps at 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



      

_______________________________________________
Amps mailing list
Amps at contesting.com
http://lists.contesting.com/mailman/listinfo/amps