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61. Re: [Amps] odd problem with Henry 5K (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Thu, 31 Oct 2013 21:46:25 -0400; I have heard that some tubes, I think tetrodes, will radiate broadband noise if not completely cut off. Not sure if this happens with triodes though. I check of the bias voltages would be a starting; /archives//html/Amps/2013-10/msg00484.html (7,938 bytes)
62. [Amps] "N, " "TNC" and "BNC" connectors are rated at 500 Watts and work at 1, 000 Watts as log as the load is good.. (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sun, 10 Nov 2013 22:05:46 -0500; Hi Bill WB6RFW: << Now that I'm in the middle of doing a QSK mod to the Henry 2KD-4 ... I'm looking at the BNC input connector to the amp. It occurs to me that if I use my FT-2000D barefoot through t; /archives//html/Amps/2013-11/msg00229.html (7,729 bytes)
63. Re: [Amps] Fan sounds like F-15 (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sun, 24 Nov 2013 15:53:07 -0500; I've been using my new 4CX1000A amplifier for a few days. It works great. But there is one problem that I need to solve: the fan -- it's a flat centrifugal type -- here's a construction photo from m; /archives//html/Amps/2013-11/msg00414.html (8,618 bytes)
64. Re: [Amps] E-core transformer (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sun, 01 Dec 2013 11:42:20 -0500; I have a quantity of salvaged transformers that I want to re-use but am having a lot of trouble taking them apart so that I can rewind. I've tried heating with a heat gun, but the ferrite falls apar; /archives//html/Amps/2013-12/msg00007.html (7,450 bytes)
65. Re: [Amps] Is this tube anygood for a monoband 80meter GG amp (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sun, 15 Dec 2013 17:23:24 -0500; Well its been awhile since I posted to this list but read the posts. My weakness is how to determne if this tube is suitable for use as a ssb amp and does anyone have a tutorial or link on how to us; /archives//html/Amps/2013-12/msg00119.html (8,657 bytes)
66. Re: [Amps] Air temps leaving the amp. (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Mon, 03 Feb 2014 13:01:52 -0500; This raises an interesting issue. How does one reduce the impeller speed on a blower with a 120 VAC motor (capacitor start)? I've done some tests on several blowers (3370 rpm) and find the rpm doesn; /archives//html/Amps/2014-02/msg00032.html (8,855 bytes)
67. Re: [Amps] Solid State Relays Again (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Mon, 10 Feb 2014 09:00:35 -0500; I just had a solid state relay in my 8877 power supply short during the RTTY contest this weekend. I use 2 relays, one to short out the step start resistor, and the other one for the other leg of th; /archives//html/Amps/2014-02/msg00070.html (9,656 bytes)
68. Re: [Amps] HV Fuses (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sat, 22 Feb 2014 18:49:29 -0500; /*snip*/ blowing the fuse and tripping the power supply magnetic circuit breaker. with a boom. When this happened, the plate current was about 1.5 A, roughly 65% over the fuse rating. I believe the f; /archives//html/Amps/2014-02/msg00222.html (7,286 bytes)
69. Re: [Amps] Cool Amp Silver Plating (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Fri, 28 Feb 2014 13:06:20 -0500; I've used Cool-Amp powder for many years. It works fine, is easy to use. I think the coating is only a molecule or two thick, repeated application increases the plating's thickness, although hundreds; /archives//html/Amps/2014-02/msg00275.html (8,520 bytes)
70. Re: [Amps] 3-400Z question (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Sun, 13 Apr 2014 14:21:44 -0400; < Jeff, 3-400Z tubes will work very well in a 6m amplifier. The only precaution is try to test them before committing to all the work needed to build a new amplifier. If you plan ahead a bit, the amp; /archives//html/Amps/2014-04/msg00138.html (7,960 bytes)
71. Re: [Amps] Filament Voltage Question (score: 1): Author: KA4INM <ka4inm@gmail.com>; Date: Tue, 22 Apr 2014 14:02:02 -0400; Hi Jim W8ZR Garland: A note from WC6W pointed out that the particular tube in question, a 4CX3500A, actually uses a directly heated cathode, although I'm not sure that makes a lot of difference (exce; /archives//html/Amps/2014-04/msg00192.html (10,000 bytes)
72. Re: [Amps] Info on HP power supply (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Tue, 08 Jul 2014 05:11:01 -0400; I am going to use these same PSU, looked extensively on the WEB to no avail.If you find the documentations, please share! I saw plenty of pages where the connections were reverse engineered so the P; /archives//html/Amps/2014-07/msg00022.html (8,393 bytes)
73. Re: [Amps] Amp Supply LK-500ZBx 3-500z tube & cooling question (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Wed, 09 Jul 2014 03:10:15 -0400; /*snip*/ My early Amp Supply LK-500ZB model has the letter X at the end, reading LK-500ZBx, The x is also included at the end of the three digit serial number 500x. Does anyone have any idea as to wh; /archives//html/Amps/2014-07/msg00036.html (8,331 bytes)
74. Re: [Amps] HV Diodes (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Wed, 08 Oct 2014 09:36:35 -0400; When companies pot a string of 1N4007's (1 kV at 1 Amp) they rate the string at .75 Amp. The diodes, lacking the posts or copper foil to act as heat sinks, run hotter when potted. Short leads to the; /archives//html/Amps/2014-10/msg00024.html (9,494 bytes)
75. Re: [Amps] Alpha 8410 using 4CX1500B - why? (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Wed, 29 Oct 2014 17:57:33 -0400; This last contest weekend I was at the CE6TC contest site. It was a two station setup, one equipped with an Alpha 89, the other with a Ten Tec. Both amps worked great, but the streams of hot air blo; /archives//html/Amps/2014-10/msg00240.html (9,185 bytes)
76. Re: [Amps] Old Moto RF Decks (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Tue, 02 Dec 2014 22:28:15 -0500; /* snip */ If you want to keep things simple, the easiest way to reduce IMD in solid state amps is to give them lots of negative feedback. To do that, you have to start with excess gain! 30 years ago; /archives//html/Amps/2014-12/msg00016.html (8,702 bytes)
77. Re: [Amps] Linearization problem (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Thu, 04 Dec 2014 13:25:38 -0500; When this contraption is driven by a SSB signal, the bias control circuit will at all times apply such a bias voltage that the output amplitude remains very highly proportional to the input amplitud; /archives//html/Amps/2014-12/msg00027.html (8,964 bytes)
78. Re: [Amps] Old Moto RF Decks (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Thu, 04 Dec 2014 13:39:05 -0500; Maybe when you think of class B solid state amps, you include a small idle current? If so, then it's fine, although that kind of operation, by the old definition is class AB. In that case there has; /archives//html/Amps/2014-12/msg00028.html (8,885 bytes)
79. Re: [Amps] Alpha 76 case screws (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Thu, 04 Dec 2014 21:26:03 -0500; Does anyone know the type of screw used in the sides of the Alpha 76? It's a 6-32, stainless with some sort of a flat head . RF Concepts doesn't have a clue. I have a picture if someone can help ID; /archives//html/Amps/2014-12/msg00033.html (7,571 bytes)
80. [Amps] <-- FW: Ameritron AL1500 help (score: 1): Author: KA4INM radio <ka4inm@gmail.com>; Date: Tue, 16 Dec 2014 08:59:35 -0500; Hi Ed es Matt, I had the exact same problem a few years ago with my AL-1500. Check that the machine screws that support the HV diode board through the bottom of the amp case are good and tight. The d; /archives//html/Amps/2014-12/msg00063.html (7,812 bytes)

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