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Re: [Amps] Gi-7b

To: AMPS <>
Subject: Re: [Amps] Gi-7b
From: Tony King - W4ZT <>
Date: Mon, 26 Jun 2006 22:21:56 -0400
List-post: <>

Take a look at the projects by W4EMF <> and K4POZ, 

Treat the GI-7B like any other old tube. It's a very stable little tube 
that will give you 55 to 60% efficiency in Grounded Grid with tuned 
input. I am currently doing a six meter conversion and retrofit of an 
old butchered SB-200 with a single GI-7B.

Good luck with your project!

73, Tony W4ZT

Mike(W5UC) & Kathy(K5MWH) wrote:
> Good Evening All:
> I found this group while searching for information on the Gi-7b Russian 
> tubes.  So, here is the question.  Has anyone used the Gi-7b in an amplifier? 
>   I am in the process of building a new amp for 6 meters using a pair of 
> these tubes. What kind of output did you get, and at what efficiency? I have 
> seen data saying anywhere between 700 & 1200 watts for a pair at 6 meters, 
> and at efficiencies from 57% to 68.5%  
> Did you burn the tubes in before applying HV and drive?  What was your burn 
> in process?
> Any input would be greatly appreciated.
> 73,
> Mike, W5UC
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