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41. Re: [Amps] Alpha Input SWR (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 09 Jan 2015 19:43:50 -0800; Buy a small LDG automatic antenna tuner such as the Z-100 to go between the rig and the amp. - Paul What is bad about SWR <2? 73 Peter Charly, Changing the length of coax to the input will not change; /archives//html/Amps/2015-01/msg00015.html (12,114 bytes)
42. [Amps] Biasing a Class C modulated final (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 17 Feb 2015 12:11:32 -0800; I am building a 2x813 class C final modulated by 2x813. The typical way to bias the class C final is with a combination of fixed bias applied to the control grid and bias derived from the rf drive th; /archives//html/Amps/2015-02/msg00100.html (6,965 bytes)
43. Re: [Amps] Question about 4CX800 amplifiers (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 17 May 2015 17:56:32 -0700; Email acom@acom-bg.com and ask. They are excellent at providing technical info and help. - Paul KW7Y I wonder if someone can explain the presence of two LC rejections (20pF series with 150nH) in the; /archives//html/Amps/2015-05/msg00120.html (7,511 bytes)
44. Re: [Amps] SB-220 6 meter input network (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 07 Jul 2015 08:51:19 -0700; I used a 6" piece of home made 30Ohm coax from the tubes to the matching network. The pi network was 100pF trimmer on the input side, a 40pF trimmer on the output side and an aprox .16uH coil. - Paul; /archives//html/Amps/2015-07/msg00017.html (7,741 bytes)
45. [Amps] Eimac 4X150A - 13 available (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 12 Aug 2015 17:57:04 -0700; I have thirteen 4x150As. I suspect they are pulls but I don't know the origin. Would anybody like them? $19 each including shipping? Less if you want multiple tubes. If you pay by PayPal and notify m; /archives//html/Amps/2015-08/msg00038.html (6,750 bytes)
46. Re: [Amps] Amplifier Vs Plate Modulated (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 02 Dec 2015 14:55:32 -0800; I assure you that AM is alive and well. You might also consider that most older amps (not all) when you are not speaking on SSB have 0% efficiency, and around 300W to 400W plate dissipation. You may; /archives//html/Amps/2015-12/msg00011.html (9,028 bytes)
47. Re: [Amps] SB 220 Exploding Resistor (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 17 Jan 2016 12:03:58 -0800; It was probably an arc in one of the uibes. Use an ohm meter and make sure there is no short between the plate caps and ground. Assuming there isn't, replace the resistor (usually 25 Ohm wire wound 2; /archives//html/Amps/2016-01/msg00028.html (9,169 bytes)
48. [Amps] Supplier for RD16HHF1 transistor ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 22 Feb 2016 07:52:55 -0800; Does anybody know of a RELIABLE supplier for the obsolete RD16HHF1 transistor? - Paul KW7Y -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ____; /archives//html/Amps/2016-02/msg00051.html (7,494 bytes)
49. Re: [Amps] Supplier for RD16HHF1 transistor ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Mon, 22 Feb 2016 10:55:15 -0800; Thanks to all that pointed me to RF Parts. They have them in stock at a great price. I thought they were obsolete, but clearly not. - Paul - Paul KW7Y -- This email has been checked for viruses by Av; /archives//html/Amps/2016-02/msg00055.html (8,606 bytes)
50. [Amps] Bird slugs component values ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 03 Mar 2016 12:32:49 -0800; I am trying to take a UHF slug and turn it to an HF slug. Does any body have any documentation on the value of components (R-load, L-sample) for the various slugs? Thanks - Paul -- This email has bee; /archives//html/Amps/2016-03/msg00006.html (7,349 bytes)
51. [Amps] Adjustable Regulated Screen Supply. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 08 Mar 2016 12:51:40 -0800; I have acquired a commercially made adjustable regulated screen supply. It uses 2 x 6146s in parallel as a series regulator. It supplies 175mA from 225-325 Volts. The serial number label says Trans E; /archives//html/Amps/2016-03/msg00009.html (7,503 bytes)
52. Re: [Amps] Bird slugs component values ? (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 10 Mar 2016 12:11:44 -0800; I've seen plenty of pictures of what's inside the VHF/UHF slugs, but would be very interested to see what's inside an HF slug, Any body have such a picture? - Paul -- This email has been checked for; /archives//html/Amps/2016-03/msg00018.html (8,013 bytes)
53. Re: [Amps] SELL: Mint Drake L4B amplifier Package (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 06 May 2016 14:56:57 -0700; I've moded my power supply for 3150V under load, and can get 1500W PEP. But standard 1200Ws typical. - Paul KW7Y At 09:39 AM 5/6/2016, Jim Garland wrote: Ron, how do you get "legal limit ++" out of a; /archives//html/Amps/2016-05/msg00008.html (10,779 bytes)
54. Re: [Amps] SELL: Mint Drake L4B amplifier Package (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 07 May 2016 14:50:07 -0700; How do you get away with the same power transformer? Hopefully not by increasing the primary voltage. On my sample of 1, the original power supply gives about 2600V. To get to 3400V no load I built a; /archives//html/Amps/2016-05/msg00015.html (13,968 bytes)
55. [Amps] When does an GG Amp draw current. (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 31 May 2016 11:53:10 -0700; My 2 x 3-500Z amp starts to draw a few mA of grid current with about 1 watt applied. Bias is about 8V. My home brew GS35B amp starts to draw a few mA of grid current with about 15 watts applied. Bias; /archives//html/Amps/2016-06/msg00000.html (6,987 bytes)
56. Re: [Amps] New amplifier selection: SPE (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sat, 20 Aug 2016 21:52:03 -0700; The 2K FA has been around for a while now. Is there any rumor of a new 2KW amp? - Pau Specifically, consider the SPE Expert model 1.3 instead of an Elecraft 500 watt unit. Be sure to click Price on t; /archives//html/Amps/2016-08/msg00051.html (8,237 bytes)
57. Re: [Amps] AL-82 VS Acom 1000 (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Sun, 21 Aug 2016 10:07:37 -0700; ACOM in Bulgaria provided me with schematics for my ACOM 2000A. They also provide excellent technical support via EMail. - Paul KW7Y 73 Peter, DJ7WW _______________________________________________ Am; /archives//html/Amps/2016-08/msg00064.html (9,154 bytes)
58. [Amps] Door Knob Capacitor Question (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Tue, 25 Oct 2016 12:06:59 -0700; Is there a rule of thumb for the maximum rf current allowed for a door knob cap at 14MHz ? - Paul KW7Y _______________________________________________ Amps mailing list Amps@contesting.com http://lis; /archives//html/Amps/2016-10/msg00118.html (7,566 bytes)
59. Re: [Amps] Chimney for GS35B (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 28 Oct 2016 17:15:11 -0700; I use white PVC pipe. Nothing has melted yet. - Paul REPLY: You can use a Coleman lantern replacement glass chimney. I have done this on several GS35b amps and they work perfectly. There are several; /archives//html/Amps/2016-10/msg00142.html (9,147 bytes)
60. Re: [Amps] Machlett 3-500Z tubes (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Fri, 25 Nov 2016 19:09:39 -0800; Alpha tubes has matched pairs for $278, with 2 year warranty. I have purchased 2 sets and have had no issues. - Paul KW7Y I imagine that if you buy enough of them and the manufacturer will put your n; /archives//html/Amps/2016-11/msg00119.html (8,737 bytes)

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