[Amps] Gi-7b

[Tony King - W4ZT]

Mike,

Take a look at the projects by W4EMF <http://w4emf.gs35b.com> and K4POZ, 
<http://k4poz.w4zt.com>.

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