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References: [ +from:W4EF@dellroy.com: 320 ]

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101. [AMPS] basic question about dipping the plate (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 22 Apr 2001 18:45:31 -0700; Rich, I believe that is only true if there is no load connected across the shunt side of the L-network. In that case the L-network simply becomes a hi-q series resonant trap to ground (e.g. a near de; /archives//html/Amps/2001-04/msg00471.html (9,707 bytes)
102. [AMPS] basic question about dipping the plate (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 23 Apr 2001 02:14:16 -0700; Hi Rich, Since a dipmeter doesn't measure impedance, how could I use one to prove that the input impedance of an L-network at resonance doesn't look like a dead short circuit? Mike, W4EF...... -- FAQ; /archives//html/Amps/2001-04/msg00482.html (10,072 bytes)
103. [AMPS] basic question about dipping the plate (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 23 Apr 2001 04:56:57 -0700; Okay, I'll bite, Rich. I take the L-network, parallel the L and C, and then measure the resonant frequency using a GDO. I then re-configure the network back into an L and connect it to the load. If I; /archives//html/Amps/2001-04/msg00487.html (11,827 bytes)
104. [AMPS] basic question about dipping the plate (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Tue, 24 Apr 2001 07:35:17 -0700; Yes, agreed. But the loaded L-network is neither a true series nor true parallel network. The impedance ratio of the resonant L network (Xc=Xl) will not be infinite because there is a resistive load; /archives//html/Amps/2001-04/msg00511.html (10,717 bytes)
105. [AMPS] Meter Protection for Drake L7 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 10 Mar 2001 14:50:34 -0800; Is a back-to-back pair of single 1N4003's sufficient to protect the plate current meter and grid current meter in the Drake L7, or do I need to series several of these diodes to avoid shunting signif; /archives//html/Amps/2001-03/msg00069.html (7,182 bytes)
106. [AMPS] Vacuum Capacitor Voltage Rating (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Tue, 13 Mar 2001 04:17:54 -0800; I have a vacuum cap that was pulled from an old homebrew amp that I picked up in Florida a few years ago. The part number markings on the cap are as follows: Jennings Type "UCSX" C746749 C1825 20 to; /archives//html/Amps/2001-03/msg00115.html (7,929 bytes)
107. [AMPS] Turns Counter (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 14 Mar 2001 01:49:57 -0800; Is there a more economical source for turns-counters than surplus sales of Nebraska? I need a couple for a tuner project. Thanks, Mike, W4EF................... -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/2001-03/msg00127.html (6,575 bytes)
108. [AMPS] stupid question (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 15 Mar 2001 13:39:36 -0800; Hi Peter, I just happen to have in front of me a radio shack adapter still in the burst pack - P/N 274-511 - AUDIO Y-COUPLER - "Joins three phono plugs". The interfaces are what I would call RCA conn; /archives//html/Amps/2001-03/msg00139.html (8,600 bytes)
109. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 22 Mar 2001 03:25:06 -0800; This reminds me of the time my 84 year old grandmother bought a car for us kids to drive (she raised us). When the dealer came to the house to close the deal, she said to him, "my grandson says that; /archives//html/Amps/2001-03/msg00186.html (12,943 bytes)
110. [AMPS] Problem with Ameritron AL-82 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 25 Mar 2001 03:51:39 -0800; We are having a problem with the AL-82 at the local club station. For some reason, the output power rise time on the leading edge of the vox relay closure is very slow (on the order of 1 second). If; /archives//html/Amps/2001-03/msg00243.html (8,339 bytes)
111. [AMPS] Problem with Ameritron AL-82 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 26 Mar 2001 01:12:26 -0800; In my case, I think the problem may be hot switching as Tom described since the symptoms are very consistent and on several occasions I did notice the FT-1000D's SWR meter spiking on the initial key; /archives//html/Amps/2001-03/msg00260.html (10,164 bytes)
112. [AMPS] Additional Tube Brand Question (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 1 Feb 2001 05:20:50 -0800; Stan, Do you know what the resting Ep rating was for the stock L-4B? My L-7 run around 2500V, and I am wondering how much higher I can run that before I start having to change tank components and the; /archives//html/Amps/2001-02/msg00001.html (11,702 bytes)
113. [AMPS] AL-1500, AL-82, AL-1200, QRO??? (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 3 Jan 2001 03:59:43 -0800; Hi Chuck, The club at my workplace recently picked-up an AL-82. So far it seems like a very nice amplifier. It uses 2 x 3-500Z tubes which are considerably cheaper than the 3CX1200 and the 8877 tubes; /archives//html/Amps/2001-01/msg00084.html (10,857 bytes)
114. [AMPS] Alpha (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 3 Jan 2001 06:06:26 -0800; I have an old Ten-Tec 4229 tuner that is on its second ceramic wafer switch (this is the switch used to change the L-network configuration from Hi-Z step down to Lo-Z step up). I destroyed the origin; /archives//html/Amps/2001-01/msg00087.html (11,328 bytes)
115. [AMPS] Eimac - Care and Feeding of Power Grid Tubes (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 5 Jan 2001 15:51:14 -0800; Hi All, I have an opportunity to purchase a 1967 edition of Eimac's Care and Feeding of Power Grid Tubes. I understand their are newer editions floating around. Is there any substantial difference be; /archives//html/Amps/2001-01/msg00165.html (9,349 bytes)
116. [AMPS] Clipperton L amplifier (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 22 Jan 2001 13:38:13 -0800; Hi All, Speaking of the Clipperton-L, we have one at my workplace club station which is currently dedicated to the 160 meter station. On 160 meters I was able to get about 900 watts output when I rea; /archives//html/Amps/2001-01/msg00554.html (10,445 bytes)
117. [AMPS] FCC & online Auctions (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 25 Jan 2001 03:44:30 -0800; Yes, Vic, I was most impressed by the nice clean layout. Especially the power supply. Mike, W4EF...................... -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.c; /archives//html/Amps/2001-01/msg00602.html (10,083 bytes)
118. [AMPS] Drake L7 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sun, 3 Dec 2000 22:30:33 -0800; Thanks to all who replied with information on the Drake L7. 73 de Mike, W4EF............ -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: am; /archives//html/Amps/2000-12/msg00055.html (7,378 bytes)
119. [AMPS] Alpha (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 29 Dec 2000 13:24:11 -0800; Hi All, It seems to me that all this controversy boils down the classic build or buy decision that is made in engineering all the time. Say a newbie is a doctor or lawyer with a lot of discretionary; /archives//html/Amps/2000-12/msg00357.html (14,454 bytes)
120. [AMPS] Henry 2-K (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 16 Nov 2000 08:32:18 -0800; I have an opportunity to purchase a vintage Henry 2-K floor model amp. Based upon some of the other Henry's that I have seen this one looks to be pretty old. It has rounded meters, and could easily b; /archives//html/Amps/2000-11/msg00180.html (7,358 bytes)

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