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[Amps] GI-7bT amplifier

Subject: [Amps] GI-7bT amplifier
From: Glen Zook <>
Date: Mon, 10 Jan 2011 20:05:20 -0800 (PST)
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I am in the process of building a single band linear for 160 meters using a 
pair of GI-7bT tubes.  The reason for single band is that I have 3 other linear 
amplifiers that cover 80 through 10 but none of them cover 160 meters.

Looking at various circuits (gleaned from the Internet) I notice one common 
factor and that is none of them, at least that I have found, have any provision 
for monitoring grid current.  Also, unless I am overlooking something, I don't 
find any specifications for maximum grid current for the GI-7b or GI-7bT.

My 160 meter exciter puts out a maximum of about 80 watts which definitely 
should be plenty to drive a pair of GI-7bT tubes.  Anyway, does anyone have any 
suggestions or information on if I should have any worries about this.  I am 
well aware of grid restrictions on tubes like the 811A, 572B, 3-500Z, etc.  
But, this is my first venture using the GI-7bT tubes.

Glen, K9STH


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