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121. Re: [Amps] Input SWR revisited (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 14 Jan 2015 17:59:39 -0500
Don, the swr at the 100 ohm end of the 75 ohm coax is 100/75=1.333. In the case the 75 ohm coax is 1/4 wavelength long the impedance at the other end is 75/1.333 or 56.26 ohms. The swr at the 56.26 o
/archives//html/Amps/2015-01/msg00117.html (9,489 bytes)

122. Re: [Amps] High Voltage Wire (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Tue, 20 Jan 2015 21:22:32 +0000 (UTC)
In my racecar, a radio is excess baggage. Also, when I'm making a pass down the strip, I can't hear the radio over the open exhaust... and I'm just a little too busy to be fiddling with a radio. :) I
/archives//html/Amps/2015-01/msg00184.html (7,515 bytes)

123. Re: [Amps] High Voltage Wire (score: 1)
Author: Dave Hartman via Amps <amps@contesting.com>
Date: Wed, 21 Jan 2015 15:10:07 -0500
CRT anode wire used old color TV sets is usually good for 30KV and more -- 73 Dave - AC2GL _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contestin
/archives//html/Amps/2015-01/msg00195.html (7,399 bytes)

124. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Fri, 23 Jan 2015 21:24:14 -0500
Bill, 3-500 tubes are pretty good, but I agree, 811 tubes are light duty. --Original Message-- From: Bill Turner <dezrat@outlook.com> To: Amps group <amps@contesting.com> Sent: Fri, Jan 23, 2015 9:07
/archives//html/Amps/2015-01/msg00228.html (10,571 bytes)

125. Re: [Amps] ceramic vs glass (score: 1)
Author: kf8od--- via Amps <amps@contesting.com>
Date: Sat, 24 Jan 2015 09:45:38 -0500
My Henry 4K Ultra has a 1973 3cx1500a7, still makes 2500 watts. 73, Mike KF8OD --Original Message-- From: Jim Thomson <jim.thom@telus.net> To: amps <amps@contesting.com> Sent: Sat, Jan 24, 2015 9:09
/archives//html/Amps/2015-01/msg00239.html (9,300 bytes)

126. [Amps] : Re: Vendor For Transformer Rewind (score: 1)
Author: Gary Smith via Amps <amps@contesting.com>
Date: Sat, 24 Jan 2015 14:05:15 -0800
To subscribe or unsubscribe via the World Wide Web, visit http://lists.contesting.com/mailman/listinfo/amps or, via email, send a message with subject or body 'help' to amps-request@contesting.com Yo
/archives//html/Amps/2015-01/msg00258.html (13,580 bytes)

127. Re: [Amps] ceramic vs glass (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Sat, 24 Jan 2015 20:34:38 -0500
when I think of the word colonel I think of KLINK --Original Message-- From: Col. Paul E. Cater <paulecater@gmail.com> To: Carl <km1h@jeremy.qozzy.com> Cc: Amps reflector <amps@contesting.com> Sent:
/archives//html/Amps/2015-01/msg00265.html (8,989 bytes)

128. Re: [Amps] Vendor For Transformer Rewind (score: 1)
Author: Glen Zook via Amps <amps@contesting.com>
Date: Sun, 25 Jan 2015 16:36:36 +0000 (UTC)
More and more major electric companies are going to 125 VAC +/- 2-volts as the standard with voltages on the "+" side being common during the warmer months when the load, due to air conditioning, is
/archives//html/Amps/2015-01/msg00274.html (10,739 bytes)

129. [Amps] ARD 230 C (score: 1)
Author: Jordi CASALI via Amps <amps@contesting.com>
Date: Sun, 25 Jan 2015 19:25:16 +0000 (UTC)
Dear LucaI just repair one with the same symptoms as yours. The problem was in the AM26LS31 and AM26LS32. has given me nothing but headaches. I wish you luck. If I can be of assistance do not hesitat
/archives//html/Amps/2015-01/msg00280.html (7,168 bytes)

130. Re: [Amps] Topband: Elimination of Treadmill RFI on 160 meters (score: 1)
Author: Radio WC6W via Amps <amps@contesting.com>
Date: Wed, 28 Jan 2015 08:58:47 -0800
Hi Gary, You may wish to review a posting I made here a decade ago: http://lists.contesting.com/_amps/2005-02/msg00325.html 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ Subject: Re: [Amps] Topba
/archives//html/Amps/2015-01/msg00345.html (9,670 bytes)

131. Re: [Amps] What tube? (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Thu, 29 Jan 2015 12:36:35 -0500
Manfred, you can be sure that tube life is adversely affected by frequent on/off cycles of the filament. One of the current tube manufacturers (Burle I think) has a paper on his website that suggests
/archives//html/Amps/2015-01/msg00366.html (15,757 bytes)

132. Re: [Amps] What tube? (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Thu, 29 Jan 2015 17:19:46 -0500
Bill, he had the right idea; except they last longer if you never turn them on! 73, Gerald K5GW In a message dated 1/29/2015 2:08:25 P.M. Pacific Standard Time, wlfuqu00@uky.edu writes: We had a guy
/archives//html/Amps/2015-01/msg00369.html (7,956 bytes)

133. Re: [Amps] Need Zener for 2KD-3 (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Tue, 3 Feb 2015 13:21:01 -0500
Hi All, in a homebrew amplifier with a grounded grid, one can eliminate most of the heat in the bias circuit by putting the bias between the cathode and ground. In this case the B- connects directly
/archives//html/Amps/2015-02/msg00028.html (11,211 bytes)

134. Re: [Amps] I'm not kidding: TL922 (score: 1)
Author: Louis Parascondola via Amps <amps@contesting.com>
Date: Wed, 4 Feb 2015 05:55:30 -0500
Does the dog have an invisible fence collar on? --Original Message-- From: Alek Petkovic <vk6apk@bigpond.com> To: AMPS <amps@contesting.com> Sent: Wed, Feb 4, 2015 2:41 am Subject: Re: [Amps] I'm not
/archives//html/Amps/2015-02/msg00044.html (9,516 bytes)

135. Re: [Amps] Need Zener for 2KD-3 (score: 1)
Author: Bryan Swadener via Amps <amps@contesting.com>
Date: Fri, 6 Feb 2015 02:54:48 +0000 (UTC)
Tony W4ZT offered a bias regulator. I used one in my SB-220 for a while, until changing to Jim W7RY's QSK board that incorporates electronic bias regulation and switching. Since Tony became a silent
/archives//html/Amps/2015-02/msg00071.html (11,210 bytes)

136. Re: [Amps] TL922 & dog update (score: 1)
Author: Russ Williams via Amps <amps@contesting.com>
Date: Fri, 13 Feb 2015 04:34:45 +0000 (UTC)
Since the dog test was inconclusive, the next step is what, the cat scan?  ;-) Russkw6t From: Dave Borcher <deathgrip52@gmail.com> To: amps@contesting.com Sent: Thursday, February 12, 2015 7:59 PM Su
/archives//html/Amps/2015-02/msg00095.html (7,824 bytes)

137. Re: [Amps] Biasing a Class C modulated final (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 18 Feb 2015 11:48:12 -0500
Paul, the fixed bias is there to protect the tube from excessive cathode/screen/plate current if drive power is lost. Another name used is protective bias. Your idea of using a a zener or equivalent
/archives//html/Amps/2015-02/msg00109.html (9,366 bytes)

138. Re: [Amps] high drive/low output QRO HF-2500 (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Thu, 19 Feb 2015 19:31:35 -0500
90W drive; how much reflected? 73, K5GW In a message dated 2/19/2015 5:22:23 P.M. Central Standard Time, steve@nr4m.com writes: Hello all, Took a QRO HF-2500 out of storage and put it on my 40 meter
/archives//html/Amps/2015-02/msg00119.html (8,269 bytes)

139. Re: [Amps] Ameritron Availability (score: 1)
Author: Dennis W0JX via Amps <amps@contesting.com>
Date: Wed, 25 Feb 2015 09:35:49 -0800
In the past, Ameritron has produced amplifiers in "batches." In other words, they wait until they have a certain number of orders for a particular model and then they build them. I don't know if that
/archives//html/Amps/2015-02/msg00132.html (7,539 bytes)

140. Re: [Amps] Ameritron availability (score: 1)
Author: Gerald Williamson via Amps <amps@contesting.com>
Date: Wed, 25 Feb 2015 12:54:33 -0500
Paul, this sounds like a case of having production capacity for maybe 20 amplifiers per week and having orders for 30 amplifiers per week. I don't know what the numbers actually are but you get the i
/archives//html/Amps/2015-02/msg00134.html (8,791 bytes)

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