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381. Re: [Amps] Vacuum Relay (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 14 Dec 2012 13:12:07 -0800
It doesn't take long to find some incredibly good buys on used Tektronix scopes Yes, a local ham just bought one at a great price. And I just bought a Rigol DM1102E bramd new for $379 with free shipp
/archives//html/Amps/2012-12/msg00084.html (9,536 bytes)

382. Re: [Amps] Vacuum Relay (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 17 Dec 2012 17:31:25 -0800
Sorry, I fat-fingered it. It's a DS1102E. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-12/msg00097.html (9,301 bytes)

383. Re: [Amps] MOVs (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 09 Jan 2013 10:59:00 -0800
That is NOT a good thing, because the spike raises the instantaneous voltage on the green wire. That can (and often does) cause destructive failures of interconnected equipment powered from a differe
/archives//html/Amps/2013-01/msg00066.html (8,867 bytes)

384. Re: [Amps] Ten Tec Titan 425 Fuses Blew (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 19 Feb 2013 18:05:17 -0800
More thoughts. I have three 425s, two of which are active in my SO2R contesting station. It's not unusual for both fuses to flow due to spikes on the power line. It's also very common for both fuses
/archives//html/Amps/2013-02/msg00160.html (11,083 bytes)

385. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 07 Mar 2013 16:50:08 -0800
Nope! Power line harmonics are the result of current flowing in relatively short pulses at the positive and negative peaks of the 60 Hz cycle to charge the input filter capacitor, which is used in bo
/archives//html/Amps/2013-03/msg00086.html (8,632 bytes)

386. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 07 Mar 2013 16:59:40 -0800
NO! Only the "imperfections" in a transformer are inductive (and capacitive, and resistive). The relatively inductance that we see in the circuit is "leakage inductance" -- and is due to the relative
/archives//html/Amps/2013-03/msg00087.html (9,054 bytes)

387. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 07 Mar 2013 19:08:30 -0800
No, I said exactly the opposite. If it's a capacitor input filter, the current is drawn in pulses and thus has high harmonic content. A choke input filter would reduce that effect. 73, Jim K9YC _____
/archives//html/Amps/2013-03/msg00091.html (8,620 bytes)

388. Re: [Amps] FW: Power factor correction on tube amps (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 08 Mar 2013 15:39:15 -0800
Thinking about your question and my reply, it occurred to me that you might not be aware of how Power Factor has been redefined to include both Phase Angle (the original definition) AND harmonic curr
/archives//html/Amps/2013-03/msg00101.html (10,793 bytes)

389. [Amps] Honda 2000i Portable Use (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 08 Mar 2013 16:53:29 -0800
Hi John, There are a lot of Honda 2000i generators in our contest club (based near San Francisco), and we use them for California QSO Party county expeditions. We typically run a K3 driving power amp
/archives//html/Amps/2013-03/msg00103.html (9,147 bytes)

390. Re: [Amps] 425 Amp (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 04 Apr 2013 08:16:10 -0700
On 4/4/2013 3:06 AM, Andy Cook, G4PIQ wrote: Do check the HV filter capacitors which will are very suspect by this age of amp. I've found that when they fail, the overdrive light comes on with just a
/archives//html/Amps/2013-04/msg00021.html (8,486 bytes)

391. Re: [Amps] Look at this Custom 10kW Amp (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 10 Apr 2013 23:30:37 -0700
It's not about money, it's about playing by the rules when your violation of the rules matters to others in the same sandbox. 10kW is 8.2 dB more than the legal limit in the US, which means you have
/archives//html/Amps/2013-04/msg00063.html (10,160 bytes)

392. Re: [Amps] Look at this Custom 10kW Amp (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 11 Apr 2013 10:14:39 -0700
On what justification? who has a higher ERP, the 10KW to a vertical in a restricted subdivision The resulting RFI to home entertainment systems would make that a recipe for a lynch mob! Fair-Rite wou
/archives//html/Amps/2013-04/msg00071.html (12,102 bytes)

393. Re: [Amps] Trade: 3 solid state HF amps for 1 (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sun, 14 Apr 2013 13:09:17 -0700
The Ten Tec Hercules II is hard to beat. Runs on 13.8V right out of the box. A very nice amp. They typically go used in the $800 - $1,000 range. Needs 30-40 watts to get rated power, about 550 watts.
/archives//html/Amps/2013-04/msg00112.html (7,961 bytes)

394. Re: [Amps] Trade: 3 solid state HF amps for 1 (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sun, 14 Apr 2013 14:20:15 -0700
The FCC limits gain of commercially manufactured amps; I think I remember that the number is 14 or 15 dB. If that's correct, and it's certainly close, 10W could get you something like 200-250W and st
/archives//html/Amps/2013-04/msg00115.html (8,470 bytes)

395. Re: [Amps] The Carl and Jim Show (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 05 Jun 2013 23:25:03 -0700
You're looking at two guys with massive egos who have minds like a steel trap -- rusted shut. They learned everything they know 50 years ago, and don't need to learn anything new. 73, Jim K9YC ______
/archives//html/Amps/2013-06/msg00081.html (8,023 bytes)

396. [Amps] The Pin One Problem (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 06 Jun 2013 10:28:35 -0700
The pin 1 problem generally is not a problem with the gear but with the external wiring Actually, it is a problem built into equipment by a designer/manufacturer who fails to terminate a cable shiel
/archives//html/Amps/2013-06/msg00123.html (9,938 bytes)

397. Re: [Amps] The Pin One Problem (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 06 Jun 2013 15:15:25 -0700
The Pin One Problem applies to ALL equipment with a cable shield, and to both balanced and unbalanced wiring. See the tutorials. It is simply CALLED The Pin One Problem because a guy working in pro a
/archives//html/Amps/2013-06/msg00135.html (9,481 bytes)

398. Re: [Amps] The Pin One Problem (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 06 Jun 2013 21:04:01 -0700
When you invent, create, or discover something, you get to name it. Neil did, you and I did not. :) BTW, Neil chose the name proposed by Bernhard Weingartner, the engineer who founded the excellent c
/archives//html/Amps/2013-06/msg00144.html (8,954 bytes)

399. Re: [Amps] The Pin One Problem - Common Impedance Coupling (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 07 Jun 2013 15:48:33 -0700
No, it is NOT the correct description. Joe hit the nail on the head, and Paul got a lot of it right. Old time broadcasters who "never saw these problems in big consoles" were almost certainly working
/archives//html/Amps/2013-06/msg00168.html (13,036 bytes)

400. [Amps] The Pin One Problem is NOT Common Impedance Coupling (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 07 Jun 2013 19:05:15 -0700
I don't think "ground loop" applies to ANYTHING. The word "loop" properly applies to magnetic coupling. This is just a matter of nomenclature, of course, which can mean different things to different
/archives//html/Amps/2013-06/msg00173.html (12,612 bytes)

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