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References: [ +from:w8jitom@worldnet.att.net: 69 ]

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41. [AMPS] Power Supplies (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 17 Mar 1997 09:37:36 -0500; That's part of the supply ESR, as is primary resistance (transformed by the turns ratio), core loss, capacitor series resistance, and flux leakage. A word of caution on this. If you place the paralle; /archives//html/Amps/1997-03/msg00174.html (8,637 bytes)
42. [AMPS] Icom 756 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Wed, 19 Mar 1997 21:24:49 -0500; The back pulse caused by the relay field collapse in the Drake really kills the little reed relays. Every time the reed relay opens the contact gives a big arc until it welds shut. I'd use a PNP buff; /archives//html/Amps/1997-03/msg00189.html (7,818 bytes)
43. [AMPS] More on the Amp Relay (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 20 Mar 1997 21:21:39 -0500; What does the diode do??? 73 Tom -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contes; /archives//html/Amps/1997-03/msg00201.html (6,928 bytes)
44. [AMPS] re: Radio Relay (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 21 Mar 1997 11:34:28 -0500; What does the diode do? I assume it connects between ground and the relay line of the amplifier? 73 Tom -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administr; /archives//html/Amps/1997-03/msg00206.html (7,482 bytes)
45. [AMPS] Grounding (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 21 Mar 1997 17:36:49 -0500; Hi Al, I'm assuming you are talking about RF grounds. Of major importance,everything should be tied together with minimal RF impedance. Smooth wide round conductors are better than flat rough or wove; /archives//html/Amps/1997-03/msg00209.html (7,436 bytes)
46. [AMPS] re: Radio Relay (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 21 Mar 1997 21:36:08 -0500; That's what I was curious about. It is impossible to add eternal spike protection with a diode, unless the diode is a zener or a biased diode clamp. The reason is this... The back pulse coming out of; /archives//html/Amps/1997-03/msg00210.html (9,705 bytes)
47. [AMPS] re: Radio Relay (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Sat, 22 Mar 1997 19:40:16 -0500; Hi Ron, I wasn't following the idea behing an external conventional diode, I was curious how it was being used. Back EMF is highest at the moment the current flow is broken, when the magnetic field j; /archives//html/Amps/1997-03/msg00215.html (8,862 bytes)
48. [AMPS] General amp questions (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Mon, 24 Mar 1997 20:27:37 -0500; With a 3-500Z, years. The gettering agent is not near the filament, it is coated on the anode. The only way to getter a 3-500Z is to get the anode hot to the point of showing some color. It can be do; /archives//html/Amps/1997-03/msg00231.html (8,575 bytes)
49. [AMPS] Re: [BitBucket] Ameritron/MFJ Reflector (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Tue, 25 Mar 1997 14:07:58 -0500; Not actually. Your letter resulted in correcting of a wiring jig, and that problem was corrected. It was caused by the step-start relay coil shunting the path for the supply interlock. You are correc; /archives//html/Amps/1997-03/msg00237.html (15,316 bytes)
50. [AMPS] 3CX1200-A7 & 3CX1200-Z7 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Tue, 25 Mar 1997 16:06:18 -0500; The 3CX1200A7 is, as you found out, much less stable than the 3-500Z or the 3CX1200Z7. It is about as unstable or slightly worse than the 3-1000Z and 4-1000A. Yes it can easily be solved. The cure is; /archives//html/Amps/1997-03/msg00239.html (10,328 bytes)
51. [AMPS] AIRFLOW (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Wed, 26 Mar 1997 10:55:33 -0500; The problem with the idea of watching exhaust temp is we aren't worried about the exhaust air. The true concern is tube seal and component temperature. Measuring the exhaust flow temperature actually; /archives//html/Amps/1997-03/msg00245.html (7,653 bytes)
52. [AMPS] Alpha 77DX Bias Switching (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Wed, 26 Mar 1997 12:38:25 -0500; At 20 volts of bias, you would never hear the distortion. That bias level actually places a typical 8877 a few milliamperes into conduction. The tube is class AB, but sitting right on the edge of cla; /archives//html/Amps/1997-03/msg00247.html (8,788 bytes)
53. [AMPS] good, bad, ugly (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Wed, 26 Mar 1997 14:28:00 -0500; Full power was 500-600 watts output. I got my first (non-working)L4B from a RTTY op who lived down the street from me in 1971. The only thing I recall having to change was the transformer. 73 Tom --; /archives//html/Amps/1997-03/msg00252.html (8,020 bytes)
54. [AMPS] MLA-2500B Input SWR (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 27 Mar 1997 08:35:48 -0500; Hi John, It's tough to get an auto-tuner to work into a PA, because the inherent negative feedback and varying grid current affect the input impedance as drive level changes. It actually should have; /archives//html/Amps/1997-03/msg00265.html (8,535 bytes)
55. [AMPS] Heathkit SB-1000 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Thu, 27 Mar 1997 14:29:47 -0500; Eimac sold the glass tube designs to Triton, a former ITT tube manufacturing plant in Pennsylvania. Triton is already producing 3-500Z tubes. Contrary to rumors started by one person, VHF parasitics; /archives//html/Amps/1997-03/msg00271.html (10,326 bytes)
56. [AMPS] Heathkit SB-1000 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 28 Mar 1997 01:27:15 -0500; Hi Rich, Peak anode current is not "three times the indicated current" in a class AB PA. A Chaffe analysis must be done, since the current waveshape is made complex by the less than 360 degree conduc; /archives//html/Amps/1997-03/msg00275.html (10,869 bytes)
57. [AMPS] Heathkit SB-1000 (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 28 Mar 1997 03:14:32 -0500; I got in a rush to reply, and started doing an AC analysis of dc tube currents. That part was OK, but tonight's post was a mess. Scratch all that. Peak instantaneous current actually ranges from two; /archives//html/Amps/1997-03/msg00276.html (9,765 bytes)
58. [AMPS] Broadband input circuit (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 28 Mar 1997 18:15:48 -0500; Hi Carl, Remember the input circuit serves the function of an RF path for cathode currents, and there are harmonics generated in the tube. If you don't use a system that provides a low impedance to g; /archives//html/Amps/1997-03/msg00293.html (7,570 bytes)
59. [AMPS] Re: 3-500Z/ G (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 28 Mar 1997 18:21:53 -0500; Could you describe the symptoms that indicated an "instabilty problem"? 73 Tom -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQU; /archives//html/Amps/1997-03/msg00294.html (8,816 bytes)
60. [AMPS] Strange Idea for an Input (score: 1): Author: w8jitom@worldnet.att.net (Tom Rauch (W8JI)); Date: Fri, 28 Mar 1997 18:53:04 -0500; First I'd like to say I'm sorry about all the non-technical traffic. I'm fully comfortable with technical disagreements, because everyone learns more when issues are discussed. No one learns anything; /archives//html/Amps/1997-03/msg00295.html (8,542 bytes)

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