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References: [ +from:wd7s@earthlink.net: 12 ]

Total 12 documents matching your query.

1. Re: [Amps] 3CPX800A7 (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Fri, 26 Dec 2008 19:57:33 -0800

Hi Rodger Physically the tubes are not the same. The (Eimac)CPX version has a taller ceramic portion allowing a much higher plate voltage, (3500 volts). Svetlana made this tube with the taller cerami

/archives//html/Amps/2008-12/msg00343.html (10,685 bytes)

2. Re: [Amps] Alpha 87A Tubes 3CX800A7 and the 3CX P 800A7 ? (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sun, 30 Dec 2007 16:44:53 -0800

Yes and no. The CPX version is rated for a higher plate voltage than the CX version with the Eimac tube. The CPX tube has a taller ceramic insulating portion at the base. The Svetlana CPX and CX vers

/archives//html/Amps/2007-12/msg00276.html (8,634 bytes)

3. [Amps] Off Topic (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Tue, 23 May 2006 20:16:13 -0700

Greetings ampers Anyone have a current e-mail address for Norm, N8NH? The bright.net one bounced. Please reply off the list. 73, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://home.

/archives//html/Amps/2006-05/msg00307.html (6,686 bytes)

4. Re: [Amps] Building or Buying a Tuned Input Network (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sun, 22 Jan 2006 22:52:52 -0800

Hi Bob The reason I don't supply caps or wire for the kit is simple, money!! The number of mica caps I would have to keep in stock would run me into the thousands. Every time you move the board farth

/archives//html/Amps/2006-01/msg00529.html (12,412 bytes)

5. Re: [Amps] stepper motors (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Wed, 14 Sep 2005 21:22:31 -0700

Hi Tomm Do you know how many turns you need from lock to lock on the vacuum variables? I might have something for you. This link may help you make a choice for the size, http://www.cs.uiowa.edu/~jone

/archives//html/Amps/2005-09/msg00126.html (8,697 bytes)

6. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sat, 5 Mar 2005 09:54:06 -0800

Hi Tomm With the GS-35B, (cathode tied to filament internally) I would use a filament choke and ground one side of the filament secondary, transformer side of the choke of course. A spark gap at the

/archives//html/Amps/2005-03/msg00114.html (17,466 bytes)

7. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sat, 5 Mar 2005 09:36:18 -0800

Hi Gary Tricky question !! What size glitch resistor?? How fast is the plate over-current protection, i.e. how much follow on current?? How large is the filter capacitor?? What is the secondary and p

/archives//html/Amps/2005-03/msg00112.html (10,544 bytes)

8. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sat, 5 Mar 2005 09:25:24 -0800

The gap I'm using is a Bourns 2035 series, 90 volt, 20KA (single pulse), hope the glitch resistor holds !! The gap through Mouser is $3.22 single piece price Arc to ground or internal arc to cathode,

/archives//html/Amps/2005-03/msg00110.html (14,837 bytes)

9. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sat, 5 Mar 2005 08:41:53 -0800

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) f

/archives//html/Amps/2005-03/msg00103.html (10,125 bytes)

10. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sat, 5 Mar 2005 07:57:23 -0800

Hi Rich For the 8877 at HF you can save the filament choke, a simple gas discharge spark gap at the cathode will fire long before an internal arc to cathode will jump to the filament. The discharge t

/archives//html/Amps/2005-03/msg00094.html (11,509 bytes)

11. [Amps] Tuned Input Board (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Wed, 9 Feb 2005 06:58:23 -0800

Greetings For those that have asked, the newer 200 watt version of my tuned input board is now available. It can be found here, http://home.earthlink.net/~wd7s/TU-6B.htm Cheers, Paul PAUL HEWITT WD7S

/archives//html/Amps/2005-02/msg00336.html (7,061 bytes)

12. [Amps] New Website Address (score: 1)

Author: "Paul Hewitt" <wd7s@earthlink.net>

Date: Sun, 7 Nov 2004 11:45:11 -0800

Hello Ampers I'm finally getting settled into the new California QTH and have had to change servers for the QRO website as well as my e-mail address. The new website address is listed below and the n

/archives//html/Amps/2004-11/msg00121.html (7,124 bytes)

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