Re: [Amps] GI-46B Question

[jeff millar <wa1hco@adelphia.net>]

Bob the advertisement says the GI-46b is a variant on the GI-7b.  But 
its interesting to read the description of the GI-6B, particularly the 
transfer capacitance (http://nd2x.net/gi6b.html).  Lets compare transfer 
capacitance

   GI-6B   0.25 pf   wires from cathode to anode to make it oscillate
   GI-7b    0.075 pf   good to microwave frequencies
   GI-46B 5.1 pf   wow 
(http://www.tubes.ru/techinfo/TransmittingPulseTubes/gi-46b.html)

So it look to me like they used the tube as a power oscillator in 
UHF/microwave application and include extra transfer capacitance to 
simplify the external cavity design.

I belive the statement that the tube is the last generation of small 
triode and it's the most advanced design.  But its not suitable for UHF 
and probably not for VHF.  But in an HF amplifier in Grounded Grid, it 
works fine.

jeff, wa1hco

Bob Bruno - K2KI wrote:

> Are there any examples of an amp that has been built using the GI-46B tube. I 
> see a guy on eBay selling them rather cheap I think.
> Anything that I should know about this tube that might steer me away from 
> getting one?
>
>
> 73, CUL
>
> Bob Bruno - K2KI
> k2ki@starc,org
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>  

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