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61. Re: [Amps] Soft Start (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 27 Dec 2017 09:10:05 -0600; Yes, more accurately a step-start. Regardless, thats reassuring to know! Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith _________; /archives//html/Amps/2017-12/msg00171.html (12,096 bytes)
62. Re: [Amps] Soft Start (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 28 Dec 2017 13:37:02 -0600; This makes a case that it isn't the rate at which the filament temperature rises, but in stead the fact that it passes through a particular temperature at all. If it passes through ~900F, then the M; /archives//html/Amps/2017-12/msg00184.html (9,661 bytes)
63. Re: [Amps] Amp Warm-up? (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Fri, 6 Apr 2018 08:47:06 -0500; The AL-80 series uses a 3-500Z, which uses a thoriated tungsten filament as a directly heated cathode. It takes less than 10 s to reach full temperature, which is where the 10 s required warm up come; /archives//html/Amps/2018-04/msg00007.html (9,471 bytes)
64. Re: [Amps] water purity/conductivity in water cooled tube amplifiers (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 18 Apr 2018 22:18:57 -0500; While it was a very long time ago, I recall as a kid I got to go on a tour of the old KVOO AM broadcast station in Tulsa. Their tubes were water cooled and I recall the engineer showing us their dist; /archives//html/Amps/2018-04/msg00044.html (15,448 bytes)
65. Re: [Amps] water purity/conductivity in water cooled, tube, > amplifiers (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 24 Apr 2018 08:58:05 -0500; I dont think this is correct. Every one Ive ever seen is now aluminum. Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith ___________; /archives//html/Amps/2018-04/msg00052.html (9,496 bytes)
66. Re: [Amps] AL-80A - Pi/Pi-L Switch Wafer Failure due to arcing (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sat, 28 Jul 2018 07:37:08 -0500; The same switch is uses on the AL-80A and AL-80B; Im pretty sure that Ameritron sells the entire switch as a replacement part. Kim N5OP "People that make music together cannot be enemies, at least as; /archives//html/Amps/2018-07/msg00084.html (8,389 bytes)
67. Re: [Amps] AL80A vs AL80B (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Tue, 5 Feb 2019 11:37:27 -0600; Here you go, straight from the guy that designed em: http://www.w8ji.com/Ameritron_al80_history.htm Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts."; /archives//html/Amps/2019-02/msg00019.html (7,607 bytes)
68. Re: [Amps] ACOM1010 Xformer growling (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 12 May 2019 12:30:43 -0500; Are you on 50 Hz or 60 Hz power? If you have a transformer designed for 60 Hz running on 50 Hz, it may well buzz quite loudly, run hot, and have poor regulation. Kim N5OP "People that make music toge; /archives//html/Amps/2019-05/msg00035.html (8,116 bytes)
69. Re: [Amps] 30L-1 rebuild (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 25 Dec 2019 21:51:44 -0600; Metal film resistors should be fine. 2 5 W will be fine. Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith _________________________; /archives//html/Amps/2019-12/msg00049.html (7,410 bytes)
70. Re: [Amps] Dielectric grease for roller inductors? (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 2 Jan 2020 20:29:24 -0600; See https://www.w8ji.com/dielectric_grease_vs_conductive_grease.htm for the full treatise. Bottom line is theconductive grease refers to its thermal, not electrical, characteristics. Kim N5OO "People; /archives//html/Amps/2020-01/msg00003.html (12,078 bytes)
71. Re: [Amps] Monitor RF output on computer screen (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sat, 7 Mar 2020 12:30:57 -0600; A small company called Telepost: Telepostinc.com/lp100.html. Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith _____________________; /archives//html/Amps/2020-03/msg00008.html (10,138 bytes)
72. Re: [Amps] SB220 running plate current when no drive; Problem (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 8 Oct 2020 10:51:41 -0500; I had an AL80A for which I built a 4000 V power supply. The output network needed a fair bit of change on the low bands because the load point changed, but it would easily make 1200 W out on 40 m (th; /archives//html/Amps/2020-10/msg00020.html (10,646 bytes)
73. Re: [Amps] SB220 running plate current when no drive; Problem (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 8 Oct 2020 13:48:12 -0500; I think as long as the max grid *dissipation* isnt exceeded, the grid *current* is at best an about here guide. But what I couldnt determine is, given the grid current, whats the dissipation? Is ther; /archives//html/Amps/2020-10/msg00027.html (9,923 bytes)
74. Re: [Amps] Distilled water in a dummy load ? (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Mon, 22 Feb 2021 14:11:28 -0600; A quick note about distilled water: if the resistor gets hot enough to boil water at its surface (regardless of the temperature of the water mass), the steam will partially insulate the the resistor; /archives//html/Amps/2021-02/msg00032.html (13,985 bytes)
75. Re: [Amps] AL-811 Tube Swap (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 28 Apr 2021 14:23:28 -0500; What Ive read on this says not to expect much more out because the B+ is a bit low for 572Bs. But otherwise, its a simple swap. The 572Bs are more rugged. Kim N5OP "People that make music together ca; /archives//html/Amps/2021-04/msg00101.html (7,342 bytes)
76. Re: [Amps] AL-811 Tube Swap (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Thu, 29 Apr 2021 10:55:53 -0500; The temperature for sublimation of graphite is about 4000K. Itll be bright white at that temperature and the envelope will likely be melted. Kim N5OP "People that make music together cannot be enemie; /archives//html/Amps/2021-04/msg00106.html (9,862 bytes)
77. Re: [Amps] 1N Diodes (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 30 Jun 2021 08:14:04 -0500; Dont see why not since it appears the only different is PIV rating (600 V for the 1N4007 vs 50 V for the 1N4001). Kim N5OP "People that make music together cannot be enemies, at least as long as the; /archives//html/Amps/2021-06/msg00019.html (7,923 bytes)
78. Re: [Amps] 1N Diodes (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Wed, 30 Jun 2021 09:08:31 -0500; I think the forward drop is the essentially the same for both diodes. Unless the circuit depends on the diode breaking down when reverse biased, I don;t know why there would be any difference. My gue; /archives//html/Amps/2021-07/msg00004.html (8,980 bytes)
79. Re: [Amps] Need Smarter Than I Am Help. (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 10 Oct 2021 12:10:16 -0500; I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-; /archives//html/Amps/2021-10/msg00007.html (8,661 bytes)
80. Re: [Amps] Need Smarter Than I Am Help. (score: 1): Author: Kim Elmore <cw_de_n5op@sbcglobal.net>; Date: Sun, 10 Oct 2021 11:24:11 -0500; I did this once on a single-tube 3-500Z amp (an AL-80A) and raised the B+ about the same amount. A few back-of-the-envelope calculations showed that I needed more L in the tank circuit. It used a Pi-; /archives//html/Amps/2021-10/msg00029.html (15,806 bytes)

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