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

[Paul Hewitt]

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