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41. [AMPS] YC-156 Input impedance (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Wed, 3 Oct 2001 09:04:12 -0500; PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net Using Eimac's characteristic curves in a software generated Chafffe analysis all for class AB2: 6000v @ 14000w=30 ohms ca; /archives//html/Amps/2001-10/msg00049.html (9,567 bytes)
42. [AMPS] YC-156 Input impedance (score: 1): Author: wd7s@att.net (PAUL HEWITT); Date: Wed, 3 Oct 2001 18:29:43 -0500; --Original Message-- From: owner-amps@contesting.com [mailto:owner-amps@contesting.com]On Behalf Of Tom Rauch Sent: Wednesday, October 03, 2001 3:04 PM To: KD4LYH; amps@contesting.com; Phil Clements;; /archives//html/Amps/2001-10/msg00062.html (9,158 bytes)
43. [Amps] 8877 Amp (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sun, 24 Aug 2003 08:47:55 -0700; Greetings I've just posted some new information and early test results for the 8877 no tune amp. See it here, http://wd7s.home.att.net/gallery-5a.htm Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW CO; /archives//html/Amps/2003-08/msg00026.html (6,585 bytes)
44. [Amps] Amplifier Parts FS (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Wed, 10 Sep 2003 12:50:18 -0700; Greetings I'm doing a little cleaning in the shop and have some parts that are surplus to my needs. See them here, http://wd7s.home.att.net/mscparts.htm Please contact me direct. Thanks, Paul PAUL HE; /archives//html/Amps/2003-09/msg00097.html (6,964 bytes)
45. RE: [Amps] Driving Z of 572-b's (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sat, 11 Oct 2003 07:38:58 -0700; Hi Mark Bill Orr has it listed at 215 ohms per tube so half that for a pair. 73, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net ___________________________________; /archives//html/Amps/2003-10/msg00085.html (8,411 bytes)
46. RE: [Amps] AMP RATING FOR HEC CERAMIC CAPS (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Mon, 13 Oct 2003 14:56:25 -0700; Hi Norman You didn't spec a frequency. This may get you close, http://www.rfparts.com/caps.html#doorknob Or e-mail HEC at the link on this page http://www.highenergycorp.com/ceramic/rftransmit.html I; /archives//html/Amps/2003-10/msg00114.html (8,684 bytes)
47. [Amps] FT-920 Question (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Thu, 30 Oct 2003 11:03:11 -0800; Greetings Can anyone tell me if the Yaesu FT-920 has a menu setting for break-in delay like the FT-1000MP MK-IV does? It's menu item 7-4 on the 1000mp. Thanks in advance, Paul PAUL HEWITT WD7S PRODUC; /archives//html/Amps/2003-10/msg00296.html (6,438 bytes)
48. RE: [Amps] pi-net programs (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sat, 1 Nov 2003 06:34:26 -0800; Hi Carl Have you tried Ian's spread sheet?? It's the most versatile one I've used. It allows for input of tube Cout and Cmin of the tune cap separately. Also accounts for the tube to tune cap lead in; /archives//html/Amps/2003-11/msg00013.html (8,732 bytes)
49. [Amps] Split Stator Capacitor (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Mon, 1 Dec 2003 12:39:53 -0800; Greetings The custom built split stator capacitor I used in the 8877 auto-tune amplifier shown on my website now has a part number at Cardwell Condenser. Cardwell Part # 154-16-17 max/min capacitance; /archives//html/Amps/2003-12/msg00018.html (7,095 bytes)
50. RE: [Amps] MLA-2500 Relay too loud! (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sat, 13 Dec 2003 08:36:45 -0800; Hi Don I have used mirror foam tape in the past with good results. It has adhesive on both sides and comes in a variety of widths. Clean both surfaces with rubbing alcohol first. It's a little neater; /archives//html/Amps/2003-12/msg00231.html (8,584 bytes)
51. RE: [Amps] Bird water load ratings (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sat, 13 Dec 2003 09:03:51 -0800; Hi John Are we talking about the same type loads? My 2500 watt load uses an oil dielectric that is cooled with a water loop immersed in the oil. It could be a Bird 8230 but it's marked with a militar; /archives//html/Amps/2003-12/msg00233.html (10,020 bytes)
52. RE: [Amps] Step start resistors, another solution (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Mon, 5 Jan 2004 15:14:18 -0800; I've been using SSR's for several years now for various HV supplies. The zero crossing "turn on" feature is not enough by itself to limit inrush in the larger supplies. Without step-start my 80# 4KV; /archives//html/Amps/2004-01/msg00060.html (12,965 bytes)
53. RE: [Amps] soft start circuits (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Thu, 8 Jan 2004 09:19:30 -0800; The SSR manufacturers recommend MOV's at the line side terminal to avoid DV/DT turn-on. Cheers, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net ____________________; /archives//html/Amps/2004-01/msg00093.html (8,628 bytes)
54. RE: [Amps] soft start circuits (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Thu, 8 Jan 2004 17:09:36 -0800; I normally use these as the HV supply master mains switch in the amplifier and have never had a dv/dt problem. If MOV's make you nervous, spark gaps are also suggested. According to Crydom their prod; /archives//html/Amps/2004-01/msg00096.html (11,242 bytes)
55. RE: [Amps] soft start circuits (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Fri, 9 Jan 2004 09:03:03 -0800; HI Ian For safety I still use common sense, fuse every thing and use a plug! My experience with mechanical relays here is the exact opposite, I've welded them closed twice!! Not all faults occur on t; /archives//html/Amps/2004-01/msg00108.html (10,716 bytes)
56. RE: [Amps] Chimney material (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Thu, 19 Feb 2004 13:26:14 -0800; Hi Tom It's 1/8 inch silicone rubber sheet. A small quantity supplier is here, http://www.mscdirect.com/ (they have lots of Teflon also!!) 73, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENT; /archives//html/Amps/2004-02/msg00182.html (8,763 bytes)
57. RE: [Amps] 2 x 8877 (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sun, 29 Feb 2004 02:26:04 -0800; Hi Mike The dual 8877 arrangement should cost more as it allows more dissipation. Watt for watt the 800's will cost more, more sockets more room. The lower plate voltage means lower RL which means MO; /archives//html/Amps/2004-02/msg00307.html (10,828 bytes)
58. Re: [Amps] OEP caps -------------- TSPA ------- (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Tue, 31 Aug 2004 19:20:24 -0700; Hi John I had Cardwell make up a custom split-stator tune cap for me earlier this year and all was well then. 73, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net __; /archives//html/Amps/2004-08/msg00485.html (8,053 bytes)

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