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121. [AMPS] AL-82 (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sun, 17 Jan 1999 06:45:46 EST; Sounds like a filament to grid short to me. Mark WB8JKR On Sat, 16 Jan 1999 22:44:19 -0800 "Mike Michon" <michon@eatel.net> writes: To: <amps@contesting.com> _________________________________________; /archives//html/Amps/1999-01/msg00221.html (13,639 bytes)
122. [AMPS] Adjusting fil voltage (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Wed, 20 Jan 1999 16:12:09 EST; If current is drawn from the cathode when the filament voltage is too low it will strip the cathode. Mark WB8JKR On Wed, 20 Jan 1999 08:24:07 -0500 "pmarkham" <pmarkham@newsguy.com> writes: _________; /archives//html/Amps/1999-01/msg00287.html (9,330 bytes)
123. [AMPS] Alpha 77DX grid current (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sat, 23 Jan 1999 18:15:14 EST; I have a homebrew 8877 that runs about 40- 50 ma. grid current at 1 amp plate current with a plate voltage of about 3100 volts, and from what I understand that is about right. Sounds like the meter i; /archives//html/Amps/1999-01/msg00344.html (9,179 bytes)
124. [AMPS] Pole Xformer Quiz (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sat, 05 Dec 1998 16:28:04 EST; This is a 2400 volt transformer, the 4160 spec is for 3 phase Y connection. Mark WB8JKR On Sat, 05 Dec 1998 20:28:21 +0000 W7CW Jay E Ostrem <wc7m@vcn.com> writes: ___________________________________; /archives//html/Amps/1998-12/msg00070.html (9,275 bytes)
125. [AMPS] painting 19 inch rack panels (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Wed, 23 Dec 1998 21:53:31 EST; I've always given them a work over with a 400 grit emery cloth or fine steel wool, then wipe down with alcohol before painting, always get a nice tight finish. Mark WB8JKR -- FAQ on WWW: http://www.c; /archives//html/Amps/1998-12/msg00362.html (8,221 bytes)
126. [AMPS] SB220 problems (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sat, 26 Dec 1998 07:59:36 EST; Has he checked/replaced the diode? maybe the cap is seeing a bit of AC due to diode leakage or something. Mark WB8JKR On Sat, 26 Dec 1998 19:50:02 +0800 Alek Petkovic <vk6apk@eon.net.au> writes: To:; /archives//html/Amps/1998-12/msg00409.html (12,444 bytes)
127. Fw: [AMPS] How to build the ultimate HF amplifier ? (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Mon, 02 Nov 1998 05:18:12 EST; I remember that article well! The thing used two vacuum variables on each pi network, can you IMAGINE the cost today! It was in ham radio magazine, about 71-72 I think. Mark WB8JKR __________________; /archives//html/Amps/1998-11/msg00030.html (8,719 bytes)
128. [AMPS] Parallel power transformers (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sun, 08 Nov 1998 06:38:59 EST; Sure can, just make sure the winding phase is correct. Mark WB8JKR On Sat, 7 Nov 1998 22:50:02 -0500 "frank ayers jr" <LOMAX1@prodigy.net> writes: ____________________________________________________; /archives//html/Amps/1998-11/msg00112.html (8,441 bytes)
129. [AMPS] Henry 2K Classic bias problem (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Mon, 09 Nov 1998 18:57:47 EST; If there is anyone on the list that is familar with servicing the Henry 2K Classic I'd like to pick your brain off list. Thanks, Mark WB8JKR __________________________________________________________; /archives//html/Amps/1998-11/msg00142.html (6,945 bytes)
130. [AMPS] Minimizing circulating currents on 10M. (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Thu, 22 Oct 1998 21:27:42 EDT; Minimize the "Q" Mark WB8JKR ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Jun; /archives//html/Amps/1998-10/msg00364.html (8,378 bytes)
131. [AMPS] MLA-2500 questions (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sun, 25 Oct 1998 13:24:59 EST; Brian, Make a notation on what bands it occurs and if its the same band(s) on both amps, AND can the power output problem be corrected by retuning? If the power output can be corrected by retuning, i; /archives//html/Amps/1998-10/msg00383.html (9,613 bytes)
132. [AMPS] MLA-2500 questions (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Sun, 25 Oct 1998 15:08:13 EST; You might also want to check your wattmeter!! Mark WB8JKR ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get co; /archives//html/Amps/1998-10/msg00385.html (11,080 bytes)
133. [AMPS] MLA-2500 questions (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Sun, 25 Oct 1998 20:02:06 EST; Still old tubes, lots of miles! Did you check your wattmeter to make sure its not drifting around? Are you using ALC back to the rig? Did you try a different rig? I would think if a tuned input would; /archives//html/Amps/1998-10/msg00389.html (14,092 bytes)
134. [AMPS] 572B Rejuvenating ? (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Tue, 27 Oct 1998 15:58:50 EST; Carl, I think the usual way is 5% over voltage for about 10-15 hours. But in this case it sounds like the tubes maybe about dead. Mark WB8JKR _________________________________________________________; /archives//html/Amps/1998-10/msg00409.html (8,553 bytes)
135. [AMPS] Winding chokes... (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 27 Oct 1998 17:45:57 EST; Put a piece of double sided tape on each side of the form and wind tight. Mark WB8JKR ___________________________________________________________________ You don't need to buy Internet access to use; /archives//html/Amps/1998-10/msg00414.html (9,329 bytes)
136. No subject (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Fri, 30 Oct 1998 06:18:12 EST; Anyone, Ok, Ok, I can't stand it. It may be a dumb question but just what is the 'G2DAF' design, and the principles behind it? Mark WB8JKR ____________________________________________________________; /archives//html/Amps/1998-10/msg00494.html (6,887 bytes)
137. [AMPS] Re: RF choke resonates around 23.4 Mhz errr 22.4 (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Tue, 8 Sep 1998 16:37:31 EDT; Or if your REALLY adventurous and the bandswitch can tolerate the B+, put the plate block just before the load cap and feed the DC in the low Z end of the network, the choke would be less critical th; /archives//html/Amps/1998-09/msg00104.html (11,524 bytes)
138. [AMPS] AL1200 (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Wed, 23 Sep 1998 15:47:16 EDT; Carl, would it be possible that a Pi-L is used because of the closer frequency spacing of the 160-80 meter bands they thought the better harmonic attenuation would be advantageous? Mark WB8JKR -- FAQ; /archives//html/Amps/1998-09/msg00248.html (8,990 bytes)
139. [AMPS] Alpha Info Needed (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sat, 08 Aug 1998 07:58:10 EDT; Hi Bob, If I remember right here is the way it goes: Alpha 77DX, 160-10 meters, 1-8877 tube, 4 KVA xformer Alpha 77SX, same as above except 2- 8877 tubes Alpha 76, 160-10 meters, 2-8874 tubes 1.5 KVA; /archives//html/Amps/1998-08/msg00068.html (8,826 bytes)
140. [AMPS] Date Code SB-200 (score: 1): Author: wb8jkr@juno.com (wb8jkr@juno.com); Date: Fri, 14 Aug 1998 19:42:52 EDT; Tom, The '201' was the modified version Heath came out with after the 10 meter amplifier ban they simply disabled 10 meters capability, I don't think they changed anything else. Mark WB8JKR On Fri, 1; /archives//html/Amps/1998-08/msg00149.html (7,986 bytes)

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