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Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke

To: Paul Hewitt <wd7s@earthlink.net>
Subject: Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke
From: Gary Schafer <garyschafer@comcast.net>
Reply-to: garyschafer@comcast.net
Date: Sat, 05 Mar 2005 11:58:10 -0500
List-post: <mailto:amps@contesting.com>
Have you figured how many joules of energy the amp will supply with a 
plate circuit short compared to how much energy the gas tube will handle?

73
Gary  K4FMX

Paul Hewitt wrote:
> Hi Gerald
> Eimac recommends the Siemens B1-C145 for the 3CPX5000.  I believe Phil, K5PC, 
> has looked for this and found it obsolete, not sure what he crossed it to.   
> I'm using a Bourns 2035-09-B, (90v) for the lower drive amps and the 150 volt 
> gaps for the two tube amps.  Mouser stocks a wide selection of the Bourns 
> discharge tubes, Mouser#  652-2035-09-B, (90 volt 20KA.)  I believe I 
> measured the internal capacitance of these gaps at 1-2pf.
> 
> 73, Paul
> 
> PAUL HEWITT
> WD7S PRODUCTIONS
> QRO HOMEBREW COMPONENTS
> http://home.earthlink.net/~wd7s
> 
> 
> 
>   ----- Original Message ----- 
>   From: TexasRF@aol.com 
>   To: wd7s@earthlink.net ; amps@contesting.com 
>   Sent: Saturday, March 05, 2005 8:15 AM
>   Subject: Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke
> 
> 
>   Hi Paul, please pass along the information about where to purchase these 
> gas discharge devices and to get more info about them.
> 
>   Perhaps this is what we need for our mid size tetrodes used at 432 and 
> 1296MHz for screen grid to anode flashover protection.
> 
>   Tnx/73,
>   Gerald K5GW
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 
> 



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