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61. Re: [Amps] Amp Question (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Thu, 13 Sep 2007 07:26:12 -0400
Hi Steve, IMHO, a linear amplifier remains the last bastion of that group of major projects (besides a transmatch) that can still be homebrewed cheaper than purchased "pre-manufactured." I've built t
/archives//html/Amps/2007-09/msg00136.html (8,045 bytes)

62. Re: [Amps] TL-922A (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Fri, 14 Sep 2007 11:00:34 -0400
Hi Gerald, Just one more reason to support my previous argument in favour of homebrewing... The plate transformer that delivers 2500 VDC to my 813s weighs in at 90 pounds, and will deliver 600 ma., k
/archives//html/Amps/2007-09/msg00146.html (9,424 bytes)

63. [Amps] Amplifier Distortion / Tuning / Etc. (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Thu, 27 Sep 2007 11:48:02 -0400
Good Day All, Well, from the bits & pieces that I've managed to read here lo these many days (before poking the delete button, that is!), it would seem that a great fracas has arisen within our "...A
/archives//html/Amps/2007-09/msg00412.html (7,496 bytes)

64. Re: [Amps] Off topic question (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Sun, 30 Sep 2007 08:37:37 -0400
Hi Peter, I believe the old Heathkit SSB "mono-banders" used a pair of those tubes in parallel -- the advertised power input was 200-watts, if I recall correctly... Are you familiar with that series
/archives//html/Amps/2007-09/msg00507.html (7,746 bytes)

65. Re: [Amps] HF amp output power dropping (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Sat, 6 Oct 2007 15:52:30 -0400
On 6th October, Jordan wrote... "...After 1 minute output dropped by about 50 watts. At higher wattages the loss is more pronounced, at 600 watts it may drop to 400 over a minute time..." ** Hi Jorda
/archives//html/Amps/2007-10/msg00064.html (8,223 bytes)

66. Re: [Amps] Amps Digest, Vol 58, Issue 10 (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Sun, 7 Oct 2007 11:29:36 -0400
Hi Dave, First-off, you've gotta lay down some parameters for said project, i.e.: -Do you want to use inexpensive Hamfest-type tubes, or the more modern $tuff...? -Do you want it to be a single-bande
/archives//html/Amps/2007-10/msg00076.html (8,547 bytes)

67. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Tue, 9 Oct 2007 09:24:45 -0400
Hi Guys, The old CB-type linear amplifiers can be VERY useful peripherals for the mobile operator -- especially on 10-meters, where very little is needed in the L/C networks incorporated within, beyo
/archives//html/Amps/2007-10/msg00085.html (13,128 bytes)

68. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Tue, 9 Oct 2007 11:36:00 -0400
Hi Vic et al, All the more reason to buy a tube-type CB linear amplifier for Ham service... The ones that I've seen come with conventional pi-network output circuitry which includes a variable plate
/archives//html/Amps/2007-10/msg00087.html (9,869 bytes)

69. Re: [Amps] CB Amps or full spectrum??? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Thu, 11 Oct 2007 11:24:19 -0400
On 11th October, Tom wrote... "...Not nearly as strange as I find when someone endorses a circuit without knowing how it works." ** Tsk-tsk...! Let's not forget Rules #1 and #4 of THE AMATEUR'S CODE
/archives//html/Amps/2007-10/msg00130.html (8,937 bytes)

70. [Amps] Output Coupling Capacitors: Failure Mode? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Wed, 31 Oct 2007 13:02:49 -0500
Good Afternoon All, A few weeks ago there was a thread meandering its way through the reflector re. the failure mode of the output coupling capacitor in linear amplifiers -- I wish that I'd paid bett
/archives//html/Amps/2007-10/msg00287.html (8,395 bytes)

71. Re: [Amps] Output Coupling Capacitors: Failure Mode? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Wed, 31 Oct 2007 13:28:36 -0500
Hi Again All, Please excuse the confusing terminology -- when I said "buffer" capacitor, I meant "PADDER" capacitor... Sorry about that...! ~73~ Eddy VE3CUI - VE3XZ ** -- Original Message -- From: "E
/archives//html/Amps/2007-10/msg00288.html (9,358 bytes)

72. Re: [Amps] Output Coupling Capacitors: Failure Mode? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Thu, 1 Nov 2007 15:09:03 -0500
Good Afternoon All, Many thanks to everyone who took the time out of their own personal schedules to respond back to me re. my issue here with the homebrewed 2x813 KW gradually losing output power on
/archives//html/Amps/2007-11/msg00035.html (9,914 bytes)

73. [Amps] Fw: Meter Repair...? --- GOOD NEWS! (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Sat, 3 Nov 2007 08:05:56 -0500
Good Morning All, Well, I'm VERY pleased to report that, in the process of getting access for the removal of my B+ voltage monitoring meter from the front of my amplifier, the doggone thing has retur
/archives//html/Amps/2007-11/msg00036.html (8,247 bytes)

74. Re: [Amps] Conductive Grease (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Mon, 26 Nov 2007 09:22:11 -0500
Hi Guys, I recall some 25 years ago that the tool makers in General Motors where I worked used castor oil exclusively on any electro-mechanical devices they worked on... I apply it periodically on th
/archives//html/Amps/2007-11/msg00375.html (9,309 bytes)

75. [Amps] 2x813 or 2x3-500zg ? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Mon, 31 Dec 2007 09:42:32 -0500
On 31st December, Mike wrote... "... I was thinking about two 813 in grounded grid configurations but now I'm thinking why not the pair of 3-500zg from RF-parts? I newer used 3-500zg before so I can'
/archives//html/Amps/2007-12/msg00285.html (7,585 bytes)

76. Re: [Amps] 160-6m amp designs? (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Wed, 9 Jan 2008 15:29:27 -0500
On 9th January, Marv wrote... "...If you do the math, you'll discover that the tube output capacitance is all that's needed for the input capacitor in a Pi-L output network on 6 meters. The regular i
/archives//html/Amps/2008-01/msg00089.html (9,178 bytes)

77. Re: [Amps] re dishtronix amp (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Tue, 22 Jan 2008 13:44:55 -0500
Hi Guys, I just don't get it: folks are ready, willing, and able to spend HUGE dollars, for such relatively simple equipment! It's a sure sign that our dollar count has exceeded our brain cell count
/archives//html/Amps/2008-01/msg00146.html (8,523 bytes)

78. Re: [Amps] MLA-2500 (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Fri, 25 Jan 2008 09:11:59 -0500
Hi Ken, On which band are you experiencing this...? All of them...? ~73~ Eddy VE3CUI - VE3XZ ** Dentron MLA-2500 and while I'm at it I want to address the apparent mis-loading of the amplifier. cap t
/archives//html/Amps/2008-01/msg00170.html (8,029 bytes)

79. Re: [Amps] MLA-2500 (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Fri, 25 Jan 2008 12:25:14 -0500
Hi Ken, NO amplifier that I've encountered has EVER operated with the loading capacitor fully-meshed on ALL bands... Something is definitely amiss, that goes beyond just design, IMHO. Maximum capacit
/archives//html/Amps/2008-01/msg00181.html (8,236 bytes)

80. Re: [Amps] MLA-2500 (score: 1)
Author: "EP Swynar" <gswynar@durham.net>
Date: Fri, 25 Jan 2008 14:12:13 -0500
Hi Again Ken, "...Could the fact that I'm using a tuner and not a resonant antenna for each band cause this?" ** I think not, Ken -- the tuner transforms whatever impedance the wire / antenna might "
/archives//html/Amps/2008-01/msg00184.html (9,717 bytes)

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