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

[R.Measures]

This seems like a lot of trouble just to avoid using a 10a bifilar 
choke in the heater leads.

On Mar 5, 2005, at 8:41 AM, 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 at aol.com
>   To: wd7s at earthlink.net ; amps at 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
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org