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121. [AMPS] Henry 2-K (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 17 Nov 2000 23:47:42 -0800; Thanks to everyone for the replies regarding the "Vintage" Henry 2-K. A few minor caveats aside, it sounds like it is a decent find. Now to query my checkbook. 73 de Mike, W4EF.......................; /archives//html/Amps/2000-11/msg00201.html (6,836 bytes)
122. [AMPS] Hi Power Connectors (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 22 Nov 2000 23:25:29 -0800; According to MIL-PRF-39012, a series N plug is rated for 1500 volts RMS operating at sea level when tested from 5.7 to 7 MHz. This corresponds to 45KW across 50 Ohms. This power rating will of course; /archives//html/Amps/2000-11/msg00326.html (9,211 bytes)
123. [AMPS] Hi Power Connectors (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 23 Nov 2000 13:09:54 -0800; Hi Peter, I don't know the answer to your question. I didn't see an RF current rating in the Mil Spec. My experience with N's at 1500W on HF has been bad. I have seen several failures. In one case, t; /archives//html/Amps/2000-11/msg00346.html (10,392 bytes)
124. [AMPS] Hi Power Connectors (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 27 Nov 2000 16:34:01 -0800; Hi Chuck, I'll have to go back and read part 97 again just to see exactly what it says, but the way I figure it, there is nothing that says you can't own a 10KW amp, only that you can run it on the a; /archives//html/Amps/2000-11/msg00391.html (11,166 bytes)
125. [AMPS] Drake L7 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 27 Nov 2000 22:17:44 -0800; Does anyone have any experience with the Drake L-7 amplifier? Caveats? WARC Band Coverage, expected output power, etc? Thanks, Mike, W4EF........................ -- FAQ on WWW: http://www.contesting.; /archives//html/Amps/2000-11/msg00393.html (6,599 bytes)
126. [AMPS] 811A Filament Voltage (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 5 Oct 2000 22:28:30 -0700; Can anyone tell me the reliability consequences of running the filament voltage on a set of 811As a little on the low side? Specification is 6.3VAC. At Vline = 114.4 VAC, I am measuring Vfil = 5.95 V; /archives//html/Amps/2000-10/msg00098.html (6,926 bytes)
127. [AMPS] MFJ-259B Question (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Tue, 10 Oct 2000 07:10:31 -0700; While making some measurements with an MFJ-259B impedance analyzer this evening, I noticed some strange behavior. The burnt plate choke I was sweeping looked like a Hi-Z (Z>650 ohms) over most of the; /archives//html/Amps/2000-10/msg00161.html (8,502 bytes)
128. [AMPS] MFJ-259B Question (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 12 Oct 2000 05:56:49 -0700; Has anyone made a thorough comparison of the MFJ-259B with the AEA and Autek Impedance Analyzer's? The AEA seems a little sexier with the LCD graph display and computer interface, but I am wondering; /archives//html/Amps/2000-10/msg00202.html (10,318 bytes)
129. [AMPS] MFJ-259B Question (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 12 Oct 2000 06:01:24 -0700; Hi Chuck, One trick that Dick Frey suggested to me a long time ago was to tune the antenna to 1:1 VSWR with an antenna matching unit, and then terminate the tuner input with 50 Ohms. You can then mea; /archives//html/Amps/2000-10/msg00203.html (10,002 bytes)
130. [AMPS] 811A Plate Impedance? (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 12 Oct 2000 09:20:38 -0700; I am in the process of adjusting the PI Network (inductor taps) on this old 4 x 811A amp that I inherited and was wondering what impedance I should terminate the PI network with when making my adjust; /archives//html/Amps/2000-10/msg00239.html (7,607 bytes)
131. [AMPS] a sticky issue. (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 14 Oct 2000 08:50:44 -0700; Rich, Seems that issue is not that effective resistivity of nichrome increases with decreasing frequency - I don't think anybody is arguing that. What is evident is that the effective series resistan; /archives//html/Amps/2000-10/msg00302.html (12,580 bytes)
132. [AMPS] a sticky issue. (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 15 Oct 2000 08:34:53 -0700; Have spent much of my active tenure as a ham operating from club stations, I can attest to some of interesting techniques folks sometimes use when tuning amplifiers. Back at Ohio State, we had one fe; /archives//html/Amps/2000-10/msg00331.html (14,804 bytes)
133. [AMPS] a sticky issue. (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 15 Oct 2000 23:24:14 -0700; Does anyone know what the |Z| of a typical electrolytic string looks like at 1.8 MHz. Ignoring the electrolytic's impedance, I get about 0.4% attenuation for a 180uH plate choke and a single .01uF by; /archives//html/Amps/2000-10/msg00356.html (13,177 bytes)
134. [AMPS] Source for 811 tubes (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 17 Sep 2000 17:21:14 -0700; A friend of mine gave me an old homebrew 4 x 811 amp that I have been playing around with for the last few weeks. At first the amplifier would work, but now, it keeps blowing one of the grid leak bia; /archives//html/Amps/2000-09/msg00824.html (7,429 bytes)
135. [AMPS] 811A Biasing (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 23 Sep 2000 16:19:50 -0700; I have inherited an old homebrew 4 x 811A amp which I am trying to get back into working shape (my friend has dubbed it "The Widowmaker" as it had +400V on the case of the power supply when I first t; /archives//html/Amps/2000-09/msg00963.html (7,936 bytes)
136. Re: [Amps] Ameritron AL-1500 (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sun, 7 Sep 2003 23:52:41 -0700; Dave, have you listened to a CW DX pileup lately. As far as I can tell from listening to all the lid operators who don't even bother listening to the DX there is near ZERO correlation between CW prof; /archives//html/Amps/2003-09/msg00069.html (9,983 bytes)
137. [Amps] VOX Tripping and Bandswitch Damage (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Thu, 23 Oct 2003 23:47:54 -0700; Between the two Alpha 78's that we have at the local club station, we have had a number of mysterious bandswitch failures over the last few years. As these are costly and or time consuming repairs to; /archives//html/Amps/2003-10/msg00224.html (7,771 bytes)
138. Re: [Amps] VOX Tripping and Bandswitch Damage (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 25 Oct 2003 11:55:31 -0700; This is a real problem on the SB-220 (I have come close to doing what Bill describes). As he says, the three control knobs (bandswitch, tune and load controls) look exactly the same, and the detent o; /archives//html/Amps/2003-10/msg00239.html (8,845 bytes)
139. Re: [Amps] SB220 vote (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Fri, 7 Nov 2003 23:31:58 -0800; http://lists.contesting.com/archives//html/Amps/2000-09/msg00452.html Mike, W4EF.......................... _______________________________________________ Amps mailing list Amps@contesting.com http:/; /archives//html/Amps/2003-11/msg00105.html (8,139 bytes)
140. Re: [Amps] SB220 vote (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 8 Nov 2003 10:27:10 -0800; Good question, Rich, I don't know, but in the interest of full disclosure, I am not staying awake at night worrying about who designed any ham gear :):) Mike, W4EF................................. or; /archives//html/Amps/2003-11/msg00115.html (9,720 bytes)

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