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101. [Amps] 4X150A Suppressor: Yes or No? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 16 May 2018 17:08:53 -0700; Do you think a 4X150A needs a Parasitic Suppressor? I am building a small amp, grid driven, with 4 of them in parallel. Thanks - Paul KW7Y _______________________________________________ Amps mailing; /archives//html/Amps/2018-05/msg00020.html (7,274 bytes)
102. [Amps] Relationship between Q and SWR in PI network. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 23 May 2018 15:09:52 -0700; Does anybody know the relationship between Q and SWR for a PI network? For example let's say I design my amp PI output network for 7.0MHz. I simulate the Tube Impedance with a 1K resistor. I put my M; /archives//html/Amps/2018-05/msg00022.html (8,129 bytes)
103. Re: [Amps] Relationship between Q and SWR in PI network. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 25 May 2018 13:48:05 -0700; I found an online calculator http://chemandy.com/calculators/return-loss-and-mismatch-calculator.htm A resistive load of 300 Ohm in a 50 Ohm System represents about a 3dB loss over a 50 Ohm load. A r; /archives//html/Amps/2018-05/msg00025.html (12,231 bytes)
104. Re: [Amps] Relationship between Q and SWR in PI network. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 26 May 2018 11:36:25 -0700; Thanks for the info. The calculator I used gave the answer 6:1. but my test circuit gave about 4:1 on my MFJ259 http://chemandy.com/calculators/return-loss-and-mismatch-calculator.htm - Paul Q = cent; /archives//html/Amps/2018-05/msg00029.html (9,287 bytes)
105. [Amps] FOR SALE : Drake L-4B on Steroids. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 02 Jul 2018 11:27:53 -0700; Upgraded Drake L-4B Amplifier with a real 1600W PEP output. Upgrades include: New matched 3-500ZGs installed in 2015. Test Report Included. Very little use since. Rebuilt Drake Power Supply - 230VAC; /archives//html/Amps/2018-07/msg00003.html (7,838 bytes)
106. [Amps] Blue glow in a 3-500Z (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 24 Jul 2018 16:45:58 -0700; Has anybody seen a blue glow in a 3-500Z that remains there when the power is turned off for a few minutes? - Paul KW7Y _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2018-07/msg00070.html (7,205 bytes)
107. [Amps] 3-500Z labeling (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 06 Dec 2018 07:36:25 -0800; I have two 3-500Z's that I removed from a Drake L4B. These tubes have no brand labeling or residue of labeling. They are the variety that have 5 Anode disks. Has anybody seen 3-500Zs with out brand m; /archives//html/Amps/2018-12/msg00037.html (6,945 bytes)
108. Re: [Amps] Acom 2000A Question (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 04 Jun 2019 13:17:43 -0700; They provide excellent trouble shooting via EMail.Usually send an email to them in the evening and there's a reply when you wake up in the morning. - Paul At 09:20 AM 6/3/2019, Herbert Schoenbohm wro; /archives//html/Amps/2019-06/msg00013.html (8,746 bytes)
109. Re: [Amps] Wanted (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 24 Mar 2021 02:55:48 +0000; How about an Alpha 87A $2400 ________________________________ From: Amps <amps-bounces@contesting.com> on behalf of Ron Ellis <KH6DV@hawaiiantel.net> Sent: Tuesday, March 23, 2021 6:21:14 PM To: amps; /archives//html/Amps/2021-03/msg00036.html (15,479 bytes)
110. Re: [Amps] KPA1500 Efficiency vs. RF-Kit B26 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 14 Jul 2021 02:11:11 +0000; Like a key engine ________________________________ From: Amps <amps-bounces@contesting.com> on behalf of john@kk9a.com <john@kk9a.com> Sent: Tuesday, July 13, 2021 7:04:21 PM To: amps@contesting.com; /archives//html/Amps/2021-07/msg00057.html (9,009 bytes)
111. Re: [Amps] KPA1500 Efficiency vs. RF-Kit B26 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 14 Jul 2021 02:12:44 +0000; Like a key engine ________________________________ From: Amps <amps-bounces@contesting.com> on behalf of john@kk9a.com <john@kk9a.com> Sent: Tuesday, July 13, 2021 7:04:21 PM To: amps@contesting.com; /archives//html/Amps/2021-07/msg00058.html (9,190 bytes)
112. [Amps] OM-2000A+ (score: 1): Author: <paul@paulbaldock.com>; Date: Thu, 19 Aug 2021 01:32:18 -0700; I am repairing an OM-2000A+ for fiend. I need to replace the glitch resistor on the HV Board, This board is rather buried in the amp and it looks like it will be a major disassembly procedure to remo; /archives//html/Amps/2021-08/msg00038.html (6,314 bytes)
113. Re: [Amps] Amps Digest, Vol 224, Issue 12 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 19 Aug 2021 18:16:48 +0000; Thanks Jay, that's very helpful. Paul KW7Y Sent from my Verizon, Samsung Galaxy smartphone Get Outlook for Android<https://aka.ms/AAb9ysg> Paul, This is not an easy job. It may take 2 to 3 hours. You; /archives//html/Amps/2021-08/msg00040.html (10,510 bytes)
114. Re: [Amps] 1:9 un-un for grid driven tetrode (score: 1): Author: <paul@paulbaldock.com>; Date: Mon, 25 Oct 2021 10:13:28 -0700; A much simpler solution would be to use a 50Ohm resistor, no un-un, and more drive power. I don't know what the tube(s) is you are trying to drive, but for example a pair of GU74B's would require abo; /archives//html/Amps/2021-10/msg00094.html (9,586 bytes)
115. [Amps] FREE: 15KW 160m to 12m AMP in rack. (score: 1): Author: <paul@paulbaldock.com>; Date: Thu, 18 Nov 2021 12:29:15 -0800; The title say it all. Belonged to an SK who shall be nameless. Worked before I removed from his QTH in February. Reasonably well documented. At least $10K+ worth of parts. You have 2 weeks to come an; /archives//html/Amps/2021-11/msg00021.html (6,520 bytes)
116. Re: [Amps] Acom 2000A controller issue (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 6 Dec 2021 01:29:04 +0000; Email Acom in Bulgaria. They have outstanding support I am working on an Acom 2000A with the newer controller (color display). The amp worked fine the last time it was turned on a few months ago. Now; /archives//html/Amps/2021-12/msg00050.html (8,519 bytes)

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