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201. Re: [Amps] Ten Tec Centaur 411 repair? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 18 Aug 2009 12:09:50 -0700
If you do a google search on "tentec centaur 411" the first page will get you a link to the manual on Ten Tec's website. The circuitry appears to be pretty straightforward discrete transistors and di
/archives//html/Amps/2009-08/msg00350.html (8,190 bytes)

202. Re: [Amps] TENTEC TITAN 425 price? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 19 Aug 2009 23:11:01 -0700
I own three of them, all bought used in good shape. I paid ZERO attention to the finish, and would not have paid a nickel for gold. These are good amps, fairly easy to work on, almost everything you
/archives//html/Amps/2009-08/msg00363.html (8,560 bytes)

203. Re: [Amps] TENTEC TITAN 425 price? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 20 Aug 2009 09:12:01 -0700
Changes to the bandpass filters. For my two older amps that do work on 30M, with the 40M position of the bandswitch, the load control tunes at about 3 and the Tune control at about 0. All three of my
/archives//html/Amps/2009-08/msg00369.html (7,860 bytes)

204. Re: [Amps] peers (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 30 Aug 2009 20:25:53 -0700
That is part of the definition of a peer-reviewed publication. That is, the article is reviewed by experts in the field for technical accuracy. Contrary to what the popular and various interest group
/archives//html/Amps/2009-08/msg00647.html (8,058 bytes)

205. Re: [Amps] HL-2K (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 30 Aug 2009 20:35:52 -0700
http://audiosystemsgroup.com/publish Select the Tutorial about Power and Grounding for audio and video systems, or the Ham Interfacing power point. The stuff about power amps and neutrals is about ha
/archives//html/Amps/2009-08/msg00648.html (8,693 bytes)

206. Re: [Amps] Watts to DBM?? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 27 Sep 2009 14:39:38 -0700
It's actually pretty simple if you know logs. All dB values are ratios to some specified reference. The dBm means dB with 1 mW as a reference, and dB is 10 times the log of the ratio. Adding dB is li
/archives//html/Amps/2009-09/msg00346.html (9,977 bytes)

207. Re: [Amps] IC-2KL 80m toroid value (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 28 Oct 2009 08:46:34 -0700
Where is this coil in the circuit? In the input or the output? How is it "cooked?" Has the wire open circuited? Has the core cracked? Fair-Rite is the mfr of most ferrite materials sold in NA. Their
/archives//html/Amps/2009-10/msg00340.html (7,564 bytes)

208. Re: [Amps] IC-2KL 80m toroid value (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 28 Oct 2009 11:11:13 -0700
Perhaps by "common practice" at the time a particular product was built, but not "by definition." 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com ht
/archives//html/Amps/2009-10/msg00344.html (7,829 bytes)

209. Re: [Amps] TL922 Power Plugs (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 03 Nov 2009 07:49:45 -0800
Exactly right. One other VERY important point -- it is both ILLEGAL and UNSAFE to connect neutral to ground at any other point. The proper connection of a 240V load is to the two ends of the transfor
/archives//html/Amps/2009-11/msg00014.html (7,272 bytes)

210. Re: [Amps] KK5DR's ferrite loaded plate chokes. (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 17 Jan 2010 20:38:35 -0800
Yes. Yes. Yes -- BUT -- winding those turns also adds parallel capacitance, which forms a parallel resonance with the inductance. You can see MEASURED DATA from an excellent lab in Appendix One of ht
/archives//html/Amps/2010-01/msg00251.html (15,177 bytes)

211. Re: [Amps] KK5DR's ferrite loaded (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 19 Jan 2010 08:11:44 -0800
has circuit That's really the key. Another VERY important point is impedance measurement of ferrite inductors. Using traditional reflection-based instruments will often give very wrong answers, becau
/archives//html/Amps/2010-01/msg00256.html (7,923 bytes)

212. Re: [Amps] KK5DR's ferrite loaded (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 22 Jan 2010 16:01:12 -0800
Several reasons. First, there are many different KINDS of ferrites, and their properties are VERY DIFFERENT. Second, an RF choke in a filament line sees a LOT less RF that one in a plate circuit. I s
/archives//html/Amps/2010-01/msg00277.html (8,597 bytes)

213. Re: [Amps] Source for large purchase of toroids? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 23 Jan 2010 11:03:40 -0800
Amidon doesn't MAKE these parts. They BUY stuff, put their own part numbers on it, and sell it at OBSCENE MARKUPS (typically 4- 5 times their cost). I've helped organize group purchases for several h
/archives//html/Amps/2010-01/msg00289.html (8,493 bytes)

214. Re: [Amps] Source for large purchase of toroids? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 26 Jan 2010 08:13:21 -0800
They are not "different codes." they are VERY DIFFERENT MATERIALS, have VERY different properties, and used for different purposes. Micrometals makes powered iron, which are primarily used for induct
/archives//html/Amps/2010-01/msg00344.html (9,293 bytes)

215. Re: [Amps] Source for large purchase of toroids? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 26 Jan 2010 15:12:25 -0800
Sometimes I get the feeling that folks don't bother to read what I took great pains to learn and write about this. REPEATING: Appendix One of my tutorial lists the Fair-Rite part numbers of selected
/archives//html/Amps/2010-01/msg00360.html (9,587 bytes)

216. Re: [Amps] Ferrite sources (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jan 2010 12:59:20 -0800
YES! Ferroxcube has a very broad product line and publishes lots of good data. They ARE a good alternative to Fair-Rite. Thanks for alerting us to this distribution network and their published data.
/archives//html/Amps/2010-01/msg00385.html (7,569 bytes)

217. Re: [Amps] Plate Choke Resonances (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 29 Jan 2010 10:13:37 -0800
The principal resonance is a parallel resonance with its own stray capacitance. You should not have to short anything to see this. A better way to measure a choke like this may be the voltage divider
/archives//html/Amps/2010-01/msg00433.html (8,204 bytes)

218. Re: [Amps] Plate Choke Resonances (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 30 Jan 2010 10:06:01 -0800
My comment was not an ERROR, but an observation. Of course you short it to look for series resonances. Yes, you must look both ways. And I repeat my recommendation to measure the impedance vs. freque
/archives//html/Amps/2010-01/msg00518.html (9,247 bytes)

219. Re: [Amps] Titan 425 will not 'Standby' (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 01 Feb 2010 10:02:52 -0800
Perhaps the main antenna relay (a vacuum relay) is bad. The 425 includes logic to detect whether or not the relay is pulled in, and also the condition of the PTT and/or key line. There could also be
/archives//html/Amps/2010-02/msg00017.html (8,616 bytes)

220. Re: [Amps] RF issue (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 01 Feb 2010 12:39:35 -0800
You didn't say what kind of antenna or its proximity to your shack. How is it fed? Some antennas put lots of RF in the shack, depending on what kind of antenna and where it is. WRONG! There should A
/archives//html/Amps/2010-02/msg00039.html (8,717 bytes)

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