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61. [AMPS] RE: Counterpoints and corrections to Radiodan (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 5 Jun 1998 19:28:34 -0600; Hi Guys... For any who care, here are a few factual counterpoints to Dan's post of 6/3. Warning! Some of my comments may seem to border on "commercial." If you object, please feel free to hit <Del> n; /archives//html/Amps/1998-06/msg00095.html (13,221 bytes)
62. [AMPS] ALPHA/POWER ownership continuity (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 8 Jun 1998 17:51:52 -0600; Hi guys... A few facts which might conceivably be of interest to any of you who may have visited a "radio" web site which is associated with a competitor's products and recently was referenced on thi; /archives//html/Amps/1998-06/msg00115.html (8,610 bytes)
63. [AMPS] Vacuum relays (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 9 Jun 1998 12:47:37 -0600; Gerard & Rich... I'm of the understanding that tungsten contacts are pretty dicey for switching "dry circuits" like the T/R receive path. My understanding is that what makes them durable for heavy ho; /archives//html/Amps/1998-06/msg00126.html (10,943 bytes)
64. [AMPS] RE: ALPHA warranty, service & management (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 4 May 1998 11:01:28 -0600; Hi guys.. I'd like to add to the reply below that W4ETO is NOT "out of the business" at ALPHA/POWER, although I now go by W0ID and mostly keep relaxed office hours at ETO rather than at ALPHA/POWER (; /archives//html/Amps/1998-05/msg00023.html (9,857 bytes)
65. [AMPS] Oxide Cathodes (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 4 May 1998 12:24:52 -0600; Hi Jay... We've used the 3CXP5000A7/YC-179 literally by the thousand at ETO in AB2 g-g for 20+/- kW pulsed MRI service and never noticed the note that says, I think, "NORMAL Class C operation is not; /archives//html/Amps/1998-05/msg00024.html (8,456 bytes)
66. [AMPS] parasitics (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 5 May 1998 14:02:17 -0600; Oh...so asking questions is now pointless? I see, we just gotta take everything on straight belief! Ok Carl, I have asked SEVERAL other times for theories for YOUR view of things, but haven't gotten; /archives//html/Amps/1998-05/msg00050.html (10,806 bytes)
67. [AMPS] Alpha 87 (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 5 May 1998 14:30:58 -0600; Hi Mark & everyone... Got the same question from one or two guys at Visalia last week. In most practical amplifiers, including the ALPHAs 87A, 89, and 91B, the tank (pi) "Q" tends to be a bit higher; /archives//html/Amps/1998-05/msg00051.html (8,625 bytes)
68. [AMPS] Another arc question (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 8 May 1998 14:48:27 -0600; Well stated, Ian. 73, Dick But that's only a high-voltage, low-current glow discharge. The highpot tester cannot create a low-voltage, high-current arc. Only the B+ supply has the muscle to do that.; /archives//html/Amps/1998-05/msg00109.html (11,009 bytes)
69. [AMPS] Another arc question (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 12 May 1998 12:45:18 -0600; Hi Ian... A real pleasure to read your cleanly and clearly presented postings using actual algebra to calculate meaningful, real (well, actually complex I guess) results. But if you aren't careful yo; /archives//html/Amps/1998-05/msg00182.html (8,582 bytes)
70. [AMPS] filament decoupling for RF (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 18 May 1998 15:01:01 -0600; Hi Carl & All... RE: the query in your posting headed as shown at the end of my note, the ALPHA 91B uses modest unbypassed resistance in the cathode lead (12 ohms or so I think) to create a few dB of; /archives//html/Amps/1998-05/msg00326.html (8,703 bytes)
71. [AMPS] Re: (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 18 May 1998 18:13:27 -0600; Rich & interested others... Observations, opinions, caveats, and a question... 1) Ran into Tom at Dayton and after reading all the flak here was surprised to find that he's still a pretty decent guy; /archives//html/Amps/1998-05/msg00327.html (14,249 bytes)
72. [AMPS] Re: (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sun, 31 May 1998 15:14:52 -0600; Significant clinical-imaging MRI systems manufacturers that I can think of off-hand include Siemens (Munich), Philips (Eindhoven/Best), GE Medical Systems (New Berlin/Waukesha, WI), Picker (Highland; /archives//html/Amps/1998-05/msg00664.html (10,785 bytes)
73. [AMPS] Re: (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sun, 31 May 1998 14:57:43 -0600; Hi Guys, In NMR/MRI, the rf frequency (frequency of nuclear magnetic resonance) depends on the element to be imaged and, additionally, is a linear function of the magnet strength as described by the; /archives//html/Amps/1998-05/msg00665.html (10,406 bytes)
74. [AMPS] Amplifier for dxpeds and contesting (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Sun, 31 May 1998 13:55:05 -0600; Hi Mike... You can get quite complete information on the ALPHA 87A, 89, and 91B at <http://www.alpha-power-inc.com>. The 87A and 91B are stocked, sold, and serviced in Germany by Difona Communication; /archives//html/Amps/1998-05/msg00666.html (8,456 bytes)
75. [AMPS] RCA 7213 (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Wed, 1 Apr 1998 19:29:13 -0700; Hi Guys... FWIW, when I was at Electronic Communications, Inc. in Florida (parent company of Signal/One) I think we used the 7213 (as a tetrode) in a 1 kW military FM (?) rig for 225-400 MHz. 73, Dic; /archives//html/Amps/1998-04/msg00004.html (8,936 bytes)
76. [AMPS] A "no tune" amplifier output section/operation question. (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Tue, 7 Apr 1998 12:24:26 -0600; Hello Skip & all... "No tune" vacuum tube power amplifiers: All the practical ones (i.e., NOT distributed amps with 8++ tubes and efficiency <30%) are really band-pass, not broadband. Most hams have; /archives//html/Amps/1998-04/msg00053.html (12,807 bytes)
77. [AMPS] ARCING MORE (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Thu, 16 Apr 1998 12:17:07 -0600; Hi Jon & all.. How can operator error cause an arc in an unconditionally stable amp? Easily! If the load impedance presented to the anode(s) is much too high, VERY high rf plate voltage results due t; /archives//html/Amps/1998-04/msg00109.html (11,799 bytes)
78. [AMPS] ARCING MORE (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 17 Apr 1998 10:48:36 -0600; Hi again Jon... I agree with Carl 100% on this one. Based on experience I'd guess that there is virtually zero chance that in your case a defective parasitic suppressor either caused, or resulted fro; /archives//html/Amps/1998-04/msg00125.html (14,976 bytes)
79. [AMPS] ARCING MORE (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Fri, 17 Apr 1998 16:04:47 -0600; Hi Carl & everyone... It isn't nearly as bad today, but 20-25 years ago many were the ALPHA 76 series amps in for service that we doused inside and out with Formula 709, then watched the brownish-yel; /archives//html/Amps/1998-04/msg00144.html (10,748 bytes)
80. [AMPS] parasitics (score: 1): Author: w4eto@rmii.com (Richard W. Ehrhorn); Date: Mon, 20 Apr 1998 16:22:27 -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/msg00184.html (10,290 bytes)

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