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1. [Amps] YC-156 Amp (score: 1): Author: wd7s@arrl.net (PAUL HEWITT); Date: Thu, 28 Feb 2002 19:26:29 -0800; Hello Norm There's a Teflon chimney,(not shown), from the tube's cooler up to the top cover. The goal was low back pressure plus tank component cooling, seems to work FB. Air inlets are placed at var; /archives//html/Amps/2002-02/msg00315.html (7,815 bytes)
2. [AMPS] Linear AMP timing (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Wed, 8 Aug 2001 18:32:19 -0700; Hi Bill IMHO the best way to control bias/cathode current is by means of solid-state switching. It will be faster than either I/O relay operating at <2ms make and <1ms break. The bias (on/off)control; /archives//html/Amps/2001-08/msg00097.html (9,761 bytes)
3. [AMPS] Linear AMP timing (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Wed, 8 Aug 2001 19:04:50 -0700; I don't know how you test a new amp for stability but an unloaded state is the best way. If it's not stable unloaded then it's not stable. What the hell is "every amp manual" ? Paul Paul Hewitt WD7S; /archives//html/Amps/2001-08/msg00100.html (10,060 bytes)
4. FW: [AMPS] Linear AMP timing (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Wed, 8 Aug 2001 19:49:34 -0700; Attention I have, your quoted reference material I don't, There's enough hearsay/bull on this reflector. If you quote it, either know it or be prepared to reference to it! Paul Paul Hewitt WD7S PRODU; /archives//html/Amps/2001-08/msg00103.html (8,891 bytes)
5. Fw: [AMPS] 572B and an old FL2000B (score: 1): Author: PAUL HEWITT" <wd7s@arrl.net (PAUL HEWITT); Date: Tue, 21 Aug 2001 17:26:40 -0500; PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net neutralization look layout that Still configuring a new harddrive, sorry guys. Paul -- FAQ on WWW: http://www.contesting.; /archives//html/Amps/2001-08/msg00274.html (9,406 bytes)
6. [AMPS] 572B and an old FL2000B (score: 1): Author: PAUL HEWITT" <wd7s@arrl.net (PAUL HEWITT); Date: Wed, 22 Aug 2001 07:35:56 -0500; The article describes a six-meter conversion to a Swan Mark-1. I have also converted a Swan M-1 to six and found it to be a fine oscillator at 75Mhz. Suppressors cured that one. Paul neutralization h; /archives//html/Amps/2001-08/msg00284.html (9,850 bytes)
7. [AMPS] 572B and an old FL2000B (score: 1): Author: PAUL HEWITT" <wd7s@arrl.net (PAUL HEWITT); Date: Wed, 22 Aug 2001 07:42:55 -0500; Hello Tom I'm not convinced that the 572 or the 811 was ever intended for reliable operation above 20mhz and would never use either of them there. Didn't you post here a few months ago telling us tha; /archives//html/Amps/2001-08/msg00285.html (9,839 bytes)
8. [AMPS] Drake L4-B (score: 1): Author: wd7s@arrl.net (PAUL HEWITT); Date: Mon, 27 Aug 2001 20:10:46 -0500; Have you tried a different set of tubes? Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net With Drake L4-B SN #1962 after 5 min of normal operation audio becomes dist; /archives//html/Amps/2001-08/msg00346.html (7,074 bytes)
9. [AMPS] New Alpha 6 & 2 Meter Amp! (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Sun, 1 Jul 2001 13:45:36 -0700; The homebrew version of this amp from the June/August 2000 QEX is starting to look good, I built it for $2500 using all new parts, (including tubes). There's a margin! I guess my resale value just we; /archives//html/Amps/2001-07/msg00007.html (9,045 bytes)
10. [AMPS] Bird wattmeter elemnt question (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Mon, 2 Jul 2001 13:29:01 -0700; Frank Most of the Bird elements listed in the their catalogue with numbers following the "C" are for rigid transmission line sections. I can't find the C2 but C1, C12, C3, C32 etc are listed. The Bir; /archives//html/Amps/2001-07/msg00028.html (8,924 bytes)
11. [AMPS] Bird wattmeter elemnt question (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Mon, 2 Jul 2001 14:11:34 -0700; It seems the rigid line section elements are available for both 100ua and 30ua movements. A single number following the letter, (C1, C3 etc) denotes 100ua movement and two numbers , (C12, C32, C52 et; /archives//html/Amps/2001-07/msg00030.html (7,655 bytes)
12. [AMPS] 3CX800A ratings (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Wed, 4 Jul 2001 06:30:52 -0700; I believe the max plate voltage was also lowered. Even with 3kv on the plate 1500 watts out exceeds max plate dissipation and max plate current. Henry Radio "claims" 1500 watts with a single pulse ra; /archives//html/Amps/2001-07/msg00048.html (7,564 bytes)
13. [AMPS] measuring power (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Thu, 5 Jul 2001 19:50:24 -0700; What is the lowest scale you plan to use? What frequency(s)? Paul Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2001-07/msg00068.html (7,028 bytes)
14. [AMPS] Input circuit (score: 1): Author: wd7s@ARRL.NET (Paul Hewitt); Date: Fri, 6 Jul 2001 08:28:35 -0700; Hi Peter I have a reed relay selected input board that covers 160-6 plus WARC in seven selections. It's 3.5" x 4.5". E-mail me directly if you would like to see it. Paul Paul Hewitt WD7S PRODUCTIONS; /archives//html/Amps/2001-07/msg00082.html (7,665 bytes)
15. [AMPS] Input circuit (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Fri, 6 Jul 2001 14:49:25 -0700; I've tested at 100 watts ccs without external cooling. Should be a little better in a pressurized cathode compartment where it belongs. Paul Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http:; /archives//html/Amps/2001-07/msg00091.html (8,497 bytes)
16. [AMPS] Tuned input (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Mon, 9 Jul 2001 21:06:57 -0700; Doesn't the Alpha 89 use a remotely switched input network with 25 ohm connecting coax? Paul Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net http://www.contesting.com/FA; /archives//html/Amps/2001-07/msg00128.html (9,527 bytes)
17. [AMPS] Tuned Input Board (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Fri, 13 Jul 2001 15:20:57 -0700; For those that inquired, the information on the input board is now on my website. Paul Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net -- FAQ on WWW: http://www.contesti; /archives//html/Amps/2001-07/msg00163.html (6,496 bytes)
18. [AMPS] New 3cx800a7 and 4cx1600b Svetlanas (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Thu, 19 Jul 2001 19:51:20 -0700; There are, (were?) two versions, one with the smaller anode cooler diameter. Paul Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/2001-07/msg00231.html (8,883 bytes)
19. [AMPS] New 3cx800a7 and 4cx1600b Svetlanas (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Thu, 19 Jul 2001 20:21:14 -0700; Paul Hewitt WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@; /archives//html/Amps/2001-07/msg00233.html (9,846 bytes)
20. [AMPS] Looking for parts (score: 1): Author: wd7s@arrl.net (Paul Hewitt); Date: Mon, 23 Jul 2001 14:05:52 -0700; You didn't state the current rating of the feed-through caps but Surplus Sales of Nebraska has a good selection. 1/8 inch Teflon may be at Scientific Instrument Services Inc or a Google search should; /archives//html/Amps/2001-07/msg00293.html (7,296 bytes)

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