Thanks Tony. Great info. I guess if I can get 800 watts output on 6 meters
I will be happy. Anything over that will be a bonus. I'm doing a running
history of the project with my digital camera. I will put it on my web site
when it is complete.
----- Original Message -----
From: "Tony King - W4ZT" <email@example.com>
To: "AMPS" <firstname.lastname@example.org>
Sent: Monday, June 26, 2006 9:21 PM
Subject: Re: [Amps] Gi-7b
> Take a look at the projects by W4EMF <http://w4emf.gs35b.com> 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.
>> Mike, W5UC
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