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41. [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 22 Jul 2004 17:10:05 -0400; Rich, Yes, you are correct. I myself would build it the same as you. The main reason for showing these other ways was because that's how all the manufacturers used to do it and some still do, (diode; /archives//html/Amps/2004-07/msg00148.html (9,348 bytes)
42. [Amps] Tube regulators (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 23 Jul 2004 15:05:40 -0400; Gene, Yes, that can be done easily. However, not having the safety of the isolation from a transformer can be hazardous. The chassis would have to be grounded to the line ground. The problem is that; /archives//html/Amps/2004-07/msg00158.html (9,585 bytes)
43. [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 23 Jul 2004 15:15:16 -0400; What Rich says is exactly right! The voice can range anywhere in the audio spectrum and thus makes the screen current swing widely. The two tone test only uses two of the spectrums frequencies and is; /archives//html/Amps/2004-07/msg00159.html (9,404 bytes)
44. [Amps] RG8-U for HV cable (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 23 Jul 2004 16:28:25 -0400; While reading an add I received, I visited Spellman's website and found this interesting. It involves using RG8-U cable as a high voltage supply cable for remote power supplies up to 8KV. Spellman ma; /archives//html/Amps/2004-07/msg00160.html (9,751 bytes)
45. [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sat, 24 Jul 2004 15:09:17 -0400; Bill, The only problem is that the test tone signal is a constant peak to peak voltage no matter what the frequency. On the human voice, the peak to peak voltage would vary thus varying the current.; /archives//html/Amps/2004-07/msg00170.html (9,408 bytes)
46. [Amps] Re: RE: 4CX250B Screen Supplies (Gary Schafer) (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sun, 25 Jul 2004 12:49:49 -0400; Exactly, and is my point here. Yes, two tones do produce some variance but that is what the test was around. What happens when you add voice with all the frequencies and harmonics like I'm speaking o; /archives//html/Amps/2004-07/msg00187.html (8,230 bytes)
47. [Amps] Line power supplies. (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sun, 25 Jul 2004 13:02:47 -0400; Unless that floating ground fails too! Anything could fail and is my point without having the isolation of a transformer. Any type of regulator circuit will work here but the safety is nil upon any f; /archives//html/Amps/2004-07/msg00189.html (7,704 bytes)
48. [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 26 Jul 2004 03:18:47 -0400; From Ian G3SEK, "I'm jumping in here after a few days away, but all previous comments have been read and noted too." 'Several people have pointed out that a two-tone test can give better IMD results; /archives//html/Amps/2004-07/msg00191.html (11,893 bytes)
49. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Wed, 28 Jul 2004 14:58:50 -0400; Peter, Yes, your correct and there have been many other tests and investigations. I have a university test here somewhere that talks about IMD even being caused by each component that's used in the c; /archives//html/Amps/2004-07/msg00220.html (11,299 bytes)
50. Re: [Amps] RE: 4CX250B Screen Supplies - BPL (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 29 Jul 2004 11:47:19 -0400; Well, not quite that bad.LMAO! If Bill Gates and company have their way with it, they'll be running digital over the twine between the two tomato cans the kids use! BPL, LOL.... Will From: Tony King; /archives//html/Amps/2004-07/msg00228.html (7,349 bytes)
51. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 29 Jul 2004 14:13:08 -0400; Ian, I've beat this dead horse to death and if anyone doesn't think that IMD can be increased by not enough filtering, the best thing to do is just try it. Change the filtering on the power supplies; /archives//html/Amps/2004-07/msg00230.html (10,821 bytes)
52. [Amps] Re: Which Vg2 for 4CX1500B SSB ? (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 29 Jul 2004 14:25:22 -0400; Peter, Really, the screen voltage is set by the tube manufacturer for an allowable IMD, screen current, etc. by their voltage rating. The screen voltage can vary some from their ratings. The differen; /archives//html/Amps/2004-07/msg00231.html (8,606 bytes)
53. Re: [Amps] RE: 4CX250B Screen Supplies (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Thu, 29 Jul 2004 21:50:41 -0400; Mike, Yes, his last name was Waldrop. If memory serves me correctly, he worked at the airport. You are correct about Majestic Communications, and Mr. Waldrop was who designed them years ago. I don't; /archives//html/Amps/2004-07/msg00233.html (8,984 bytes)
54. [Amps] Parts question. (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 30 Jul 2004 00:17:22 -0400; Well, Does anyone know if they still make ceramic disc capacitors with built in spark gaps? They used to use these a lot in tube type color tv sets. These were made to arc if the capacitor voltage wa; /archives//html/Amps/2004-07/msg00234.html (7,158 bytes)
55. [Amps] Sparkgap capacitors. (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 30 Jul 2004 15:34:03 -0400; The spark gap ceramic disc capacitors are still being made but are not listed in several distributors catalogs. "Sprague Cera-Mite" brand has them and are named "Gap-Kap". A link to the pdf spec shee; /archives//html/Amps/2004-07/msg00243.html (8,449 bytes)
56. [Amps] Tube shunt regulators (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Fri, 30 Jul 2004 17:20:56 -0400; For historical purposes, be it still a usable circuit, I thought I would write a little in detail about using a tube type shunt regulator. In most of the RCA receiving tube manuals, under electron tu; /archives//html/Amps/2004-07/msg00244.html (8,944 bytes)
57. [Amps] Resonant choke filter (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sat, 31 Jul 2004 04:30:22 -0400; I had started designing a resonant choke filter for a supply I'm thinking about building and figured I would share the information here. I was looking at using a 5 Henry choke by Hammond Mfg. and nee; /archives//html/Amps/2004-08/msg00000.html (7,466 bytes)
58. Re: [Amps] Resonant choke filter (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Sun, 01 Aug 2004 05:13:13 -0400; Richard, Yea, I was shooting for the 3X (460Vdc X 3) but in the Allied catalog, there was a jump between 400V and 2 Kv. The X363 series from ASC goes from 100 to 400 Vdc. Then the next series is the; /archives//html/Amps/2004-08/msg00007.html (10,762 bytes)
59. Re: [Amps] Resonant choke filter (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 02 Aug 2004 10:42:13 -0400; Peter, Yes, there's a minimum inductance which can be figured by L = 0.11 x E / Imin. Imin can be figured from the bleeder resistor or minimum current draw of a device. As long as it is over this val; /archives//html/Amps/2004-08/msg00011.html (10,015 bytes)
60. Re: [Amps] Resonant choke filter (score: 1): Author: Will Matney <craxd1@ezwv.com>; Date: Mon, 02 Aug 2004 13:54:50 -0400; Peter, With looking through the books texts I have here, That is the way you design this filter using a swinging choke. With mine, I needed 400 Vdc @ 80mA maximum. So Lcrit = E / Imax which is 400 /; /archives//html/Amps/2004-08/msg00014.html (10,183 bytes)

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