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81. [AMPS] parasitics (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 20 Apr 1998 17:04:55 -0600; I've read Rich's information on his webpage and I think I can repeat his theory: He says that whenever you have a change in anode current in a tube that a small, damped VHF signal will result. He say; /archives//html/Amps/1998-04/msg00185.html (10,480 bytes)
82. [AMPS] parasitics (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 21 Apr 1998 11:37:26 -0600; Hey, Carl... I didn't write those words ... possibly one or two phrases, but not most of them. Maybe I got in trouble with "Exchange" again and accidentally copied them from another posting without s; /archives//html/Amps/1998-04/msg00202.html (13,523 bytes)
83. [AMPS] Reliability of Tube vs Solid State Amps (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 27 Apr 1998 16:07:46 -0600; Hello gents, I'd agree with just about everything Jon says, except that tubes are human-made components and subject to a certain percentage of random failures due to construction variations, just as; /archives//html/Amps/1998-04/msg00313.html (11,784 bytes)
84. [AMPS] parasitics (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 28 Apr 1998 08:30:36 -0600; Jon, if you believe in those theories that strongly then I suggest that you and Rich team up and publish an article in a reputable journal. I am a strong believer in peer review and this reflector is; /archives//html/Amps/1998-04/msg00317.html (10,780 bytes)
85. [AMPS] New 8877 tubes and SK-2210 sockets (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Wed, 29 Apr 1998 16:29:24 -0600; ALPHA/POWER, Inc. has six brand new Eimac-boxed 8877s, with full Eimac warranty, for sale at $599.00 each. Also five new SK-2210 sockets for same at $125.00 each. If interested call Scott at (970) 53; /archives//html/Amps/1998-04/msg00333.html (6,821 bytes)
86. [AMPS] Alpha 78 Input matching unit (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 3 Mar 1998 23:15:47 -0000; Hi Arturo & all.. You're right - at the time the '78 was designed and for most of its production life most transceivers had tuned-output, vacuum tube amps so the "flywheel" of a tuned-input PA wasn't; /archives//html/Amps/1998-03/msg00038.html (9,015 bytes)
87. [AMPS] John Brosnahan W0UN new ALPHA/POWER Chief (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Wed, 11 Mar 1998 22:43:07 -0000; Greetings everybody, I'm absolutely tickled to tell you that John Brosnahan, W0UN, took over as President and Technical Director of ALPHA/POWER, Inc. on March 2, 1998. Dave Wilson did a fine job of l; /archives//html/Amps/1998-03/msg00191.html (8,373 bytes)
88. [AMPS] Benefit (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 13 Mar 1998 23:17:01 -0000; Hi Jon... Generally agree with you, but IMHO if (for instance) you're trying to work VK0IR through a 20M pileup the 1.76 dB difference between 1.0 & 1.5 kW may considerably shorten your wait. Also, i; /archives//html/Amps/1998-03/msg00254.html (11,129 bytes)
89. [AMPS] Re: Drive Level in amplifiers (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Wed, 25 Mar 1998 00:29:13 -0000; Again though, my point on matching network impedances still stands. If at a low drive level my tube impedance is say 150 Ohms and at high drive levels it drops to say 75 Ohms then a matching network; /archives//html/Amps/1998-03/msg00394.html (13,563 bytes)
90. [AMPS] Plate RFC choke design (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 27 Mar 1998 17:37:20 -0700; Hi Jon & everyone... A big caveat on the two choke approach: contrary to what seems intuitively correct at a glance, two chokes in series - even if at right angles as they should be - do NOT exhibit; /archives//html/Amps/1998-03/msg00455.html (13,838 bytes)
91. [AMPS] Plate RFC choke design (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 27 Mar 1998 17:45:34 -0700; Hi Guys.... Just one comment ............. That's the popular, traditional, cherished, old theory, at least. However, orienting two coils end-to-end seemed to me like it would enhance coupling, not d; /archives//html/Amps/1998-03/msg00456.html (8,936 bytes)
92. [AMPS] Late 1980's 8877 "cathode dam" episode (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Fri, 5 Dec 1997 12:51:23 -0700; For those who expressed interest and/or skepticism about the issue, here's a reasonably accurate time line of events from our QA records. Eimac puts 8877 heat dam design change into production -- ~08; /archives//html/Amps/1997-12/msg00088.html (9,167 bytes)
93. [AMPS] parasitic suppressors (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 14:45:23 -0700; I mentioned this during the parasitics debate. The vacuum in power grid tubes is high. True, although the additional power needed to raise an object in a black-chamber-vacuum to a specific temperatur; /archives//html/Amps/1997-12/msg00150.html (12,834 bytes)
94. [AMPS] smoked TL922 (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 14:46:38 -0700; ......snip... I would solder the fast-acting 0.25A 250v fuses between the grid pins and chassis ground. . The suggestion of mounting grid fuses on the rear panel was not mine. It might be interesting; /archives//html/Amps/1997-12/msg00151.html (13,575 bytes)
95. [AMPS] LK-800 (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 14:46:21 -0700; That is the first I heard that WB8TNY was a secret Ken.....been common knowledge for years. Denny used to tell anyone that...even at Dayton. The LK-800TNY can do 5KW PEP out on SSB since it uses a xf; /archives//html/Amps/1997-12/msg00152.html (10,337 bytes)
96. [AMPS] parasitic suppressors (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 14:46:28 -0700; Agreed. When #16 -gauge copper buswire carries 15 continuous amperes, it feels barely warm to the touch. With 15 amps @ 28 MHz #16 gets blistering hot in short order. Even #12 gets hot. That's why we; /archives//html/Amps/1997-12/msg00153.html (12,772 bytes)
97. [AMPS] Microprocessor control of high power amps (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 15:37:01 -0700; Hi gentlemen.... I'm anything but a digital designer, but can offer a couple of tid-bits re the following: hi, I have some experience with this topic, but it is dated... I'm sure folks like Dick at E; /archives//html/Amps/1997-12/msg00154.html (14,890 bytes)
98. [AMPS] parasitic suppressors (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 15:57:49 -0700; I mentioned this during the parasitics debate. The vacuum in power grid tubes is high. True, although the additional power needed to raise an object in a black-chamber-vacuum to a specific temperatur; /archives//html/Amps/1997-12/msg00155.html (13,022 bytes)
99. [AMPS] parasitic suppressors (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 15:53:52 -0700; Agreed. When #16 -gauge copper buswire carries 15 continuous amperes, it feels barely warm to the touch. With 15 amps @ 28 MHz #16 gets blistering hot in short order. Even #12 gets hot. That's why we; /archives//html/Amps/1997-12/msg00157.html (12,733 bytes)
100. [AMPS] smoked TL922 (score: 1): Author: w4eto@rmii.com (richard w. ehrhorn); Date: Mon, 8 Dec 1997 15:51:18 -0700; ......snip... I would solder the fast-acting 0.25A 250v fuses between the grid pins and chassis ground. . The suggestion of mounting grid fuses on the rear panel was not mine. It might be interesting; /archives//html/Amps/1997-12/msg00158.html (10,332 bytes)

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