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1. [Amps] Input Z for 2xGI7b (score: 1): Author: Johnnie Walker <keepwalking188@yahoo.com>; Date: Sun, 25 Jan 2009 18:03:19 -0800 (PST); 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; /archives//html/Amps/2009-01/msg00291.html (6,542 bytes)
2. Re: [Amps] Input Z for 2xGI7b (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Mon, 26 Jan 2009 14:42:09 +0100; 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 Gentlemen, What's the concensus on the input resistance of a; /archives//html/Amps/2009-01/msg00293.html (7,418 bytes)
3. Re: [Amps] Input Z for 2xGI7b (score: 1): Author: Johnnie Walker <keepwalking188@yahoo.com>; Date: Mon, 26 Jan 2009 11:03:27 -0800 (PST); Thank you very much Peter for your advice. 73/jeff/ac0c therefore two tubes should grid [mailto:amps-bounces@contesting.com] On pair of GI7b? quite a wide range - from more closely for the design the; /archives//html/Amps/2009-01/msg00305.html (8,757 bytes)

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