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References: [ +from:chris@chriswilson.tv: 129 ]

Total 129 documents matching your query.

61. Re: [Amps] Info on HP power supply (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 9 Jul 2014 23:07:30 +0100
Hello Bill, Increasing the output voltage is pretty trivial, but one soon hits the over voltage protection limit, I would dearly like to know how to raise that limit a bit on both the 12 volt (say to
/archives//html/Amps/2014-07/msg00046.html (9,665 bytes)

62. Re: [Amps] Ion Pump (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sat, 19 Jul 2014 21:29:45 +0100
Hello John, Out of curiosity, what sort of vacuum levels do ceramic tubes, say a 3CX3000, have within them when new? Has there ever been any papers on how the vacuum is created and the tube sealed? I
/archives//html/Amps/2014-07/msg00079.html (9,046 bytes)

63. Re: [Amps] HV Diodes (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 8 Oct 2014 11:35:14 +0100
Hello Han, Has anyone experimented with home "potting" diode strings to make their own blocks? I am curious about diode lead length, physical orientation, and potting compound used. thanks. -- Best r
/archives//html/Amps/2014-10/msg00022.html (7,820 bytes)

64. Re: [Amps] Solid State Amps (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sat, 18 Oct 2014 17:25:40 +0100
Hello Manfred, <BIG SNIP of fascinating musing> Hams should insist that the more exotic and costly new rigs have some means of using an external monitor instead and as well as the built in display pa
/archives//html/Amps/2014-10/msg00166.html (10,071 bytes)

65. Re: [Amps] "need zener' (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 3 Feb 2015 20:11:47 +0000
Hello Bill, Bill, may I ask what and where the Henry site is please? I'm assuming it's for Henry Radio fans? Thanks. -- Best regards, Chris mailto:chris@chriswilson.tv _______________________________
/archives//html/Amps/2015-02/msg00033.html (8,510 bytes)

66. Re: [Amps] D.C. on filaments of GS-35B? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 4 Feb 2015 10:32:05 +0000
Hello Nuno, Dominic, http://f1frv.free.fr/ uses switch mode DC supplies for many of his big amp filament supplies. I am doing the same with a couple of projects, I don't expect issues. -- Best regard
/archives//html/Amps/2015-02/msg00043.html (7,939 bytes)

67. Re: [Amps] D.C. on filaments of GS-35B? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 4 Feb 2015 11:27:17 +0000
Hello Nuno, I am not qualified to say, but would imagine so long as the supply is conservatively run and checked for noise it should be fine. As you say, some of these low voltage very high current a
/archives//html/Amps/2015-02/msg00046.html (8,647 bytes)

68. Re: [Amps] I'm not kidding: TL922 (Robert Morris (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 4 Feb 2015 12:19:54 +0000
Hello Adrian, <SNIP> Don't look a gift horse in the mouth, at least your XYL calls you in, I find my dinner is in the dog if I am late... :) -- Best regards, Chris mailto:chris@chriswilson.tv _______
/archives//html/Amps/2015-02/msg00049.html (7,715 bytes)

69. Re: [Amps] I'm not kidding: TL922 (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 6 Feb 2015 15:05:21 +0000
Hello Dave, See how far away the dog receives, then if its impressive have it send a QSL card. -- Best regards, Chris mailto:chris@chriswilson.tv _______________________________________________ Amps
/archives//html/Amps/2015-02/msg00076.html (8,720 bytes)

70. Re: [Amps] more - oil bath GS-35b (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 1 Apr 2015 16:37:16 +0100
Hello Bill, There are optimum flow rates based on heat exchanger coolant medium, be it gaseous, or fluid, the type of liquid, and its viscosity. It also depends on the surface area of the inside and
/archives//html/Amps/2015-04/msg00006.html (10,831 bytes)

71. Re: [Amps] oil vs distilled water cooling. (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 14 Apr 2015 12:08:26 +0100
Hello Paul, Most "Water Wetter" type coolant additives have varying proportions of the following, if you wish to look up there conductivity: DiIsoPropyl Alcohol Ether 1-4.9% TriIsopropyl Alcohol Diet
/archives//html/Amps/2015-04/msg00097.html (8,671 bytes)

72. Re: [Amps] Henry amplifier transformer id (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Thu, 2 Jul 2015 07:41:02 +0100
Hello Mike, I have the 2000D manual in .pdf format and will e-mail it to you. I bought a 2000D in 3 phase format, with all the wiring chopped, and converted it to a big single phase HV supply. Henry
/archives//html/Amps/2015-07/msg00002.html (7,937 bytes)

73. Re: [Amps] Henry amplifier transformer id (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Thu, 2 Jul 2015 21:23:02 +0100
Hello David, Henry spec the plate voltage on valves using that transformer as 4000 to 4200 VDC, so that's the AC figure on the secondary before rectification. They used a swinging choke and full wave
/archives//html/Amps/2015-07/msg00004.html (7,710 bytes)

74. Re: [Amps] Re-imagining the 30S-1 (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Mon, 13 Jul 2015 14:18:31 +0100
Hello Martin, I bought a damp stored 240 to 6kV HV transformer, and to dry it I connected a mains driven variac to the HV side winding and two paralleled 12V car headlamp bulbs to the primary side, a
/archives//html/Amps/2015-07/msg00040.html (8,688 bytes)

75. Re: [Amps] SMPS Question (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Fri, 24 Jul 2015 16:29:46 +0100
Hello Charlie, I would be most interested in seeing photos and a schematic of this, or a similar high voltage, high current SMPS, either home brew or commercial. The tight voltage regulation, and not
/archives//html/Amps/2015-07/msg00113.html (8,790 bytes)

76. Re: [Amps] Blower noise (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Wed, 12 Aug 2015 07:39:21 +0100
In the automotive world most belt driven engine (radiator) cooling fans these days have an asymmetric blade pattern for noise reduction. I have never seen this on other than an axial fan design. I wo
/archives//html/Amps/2015-08/msg00034.html (7,792 bytes)

77. Re: [Amps] Amp output power (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Tue, 25 Aug 2015 20:32:04 +0100
Hello Mark, May I ask if the crackle finish was something the d=front panels came with, or did you achieve that finish yourself? A friend has had good success withe electrostatic coatings and an oven
/archives//html/Amps/2015-08/msg00096.html (9,429 bytes)

78. Re: [Amps] SCR to adjust 240v to 200v (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Sat, 13 Aug 2016 11:31:03 +0100
Hello Jim, Buck transformer, for sure, SCR's are more complex a solution, and may give noise or other issues. -- Best regards, Chris mailto:chris@chriswilson.tv ______________________________________
/archives//html/Amps/2016-08/msg00014.html (9,320 bytes)

79. [Amps] 3 phase HV transformers on single phase (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Thu, 27 Oct 2016 13:53:09 +0100
27/10/2016 13:47 How inefficient would running a 3 phase, three bobbin transformer (7kV @ £ Amps on 3 phase) as a single phase using two bobbins? I have been offered a transformer for scrap value wit
/archives//html/Amps/2016-10/msg00128.html (7,730 bytes)

80. [Amps] OK, here's a home brewing question. Class D amp, FET dead time understanding? (score: 1)
Author: Chris Wilson <chris@chriswilson.tv>
Date: Thu, 12 Jan 2017 12:25:55 +0000
12/01/2017 12:24 OK, it's not actually a SMPS, but similar, a 136kW LF amp. I built it some time ago. Having suffered with blown FET's on a 1kW 136khz Class D amplifier since doing some circuit mods
/archives//html/Amps/2017-01/msg00234.html (9,793 bytes)

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