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Re: [Amps] GI-46B Question

To: jeff millar <wa1hco@adelphia.net>
Subject: Re: [Amps] GI-46B Question
From: Arthur Moe <kb7ww@easystreet.com>
Date: Fri, 15 Oct 2004 15:42:48 +0000
List-post: <mailto:amps@contesting.com>
All,

If you look around these sites you will find VHF amplifiers using these tubes.  
One
 is a commercial builder in europe. See mid power list.



http://www.pollak.sulinet.hu/elektro/pa_rev/pa_rev.htm#mid_vhf

http://www.westparknet.com/business/ham%20shop/GI46Bamp.htm

http://www.qsl.net/ok2zi/pa432.html


Art
KN7WW





> 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
> >_______________________________________________
> >Amps mailing list
> >Amps@contesting.com
> >http://lists.contesting.com/mailman/listinfo/amps
> >
> >
> >
> 
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