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361. Re: [Amps] Use of 12V/115V inverter to power small tube amp? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 20 Jun 2012 16:13:08 -0700
NOISE, NOISE, NOISE, NOISE! This sort of product is notorious for generating bodacious RF noise, and you can't turn it off on RX because you must keep the filaments going. 73, Jim K9YC ______________
/archives//html/Amps/2012-06/msg00309.html (8,099 bytes)

362. Re: [Amps] Use of 12V/115V inverter to power small tube amp? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 20 Jun 2012 16:23:48 -0700
If you've got a stiff 12V source, a better solution is to find a good used Ten Tec Hercules II, a very nice solid state amp for 160-10M that runs on 12-14VDC and puts out about 550W. 73, Jim K9YC ___
/archives//html/Amps/2012-06/msg00311.html (7,568 bytes)

363. Re: [Amps] Acoustic Noise Comparison (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 21 Jun 2012 09:28:04 -0700
No experience with that amp, but some components of motor noise are vibrationally coupled to the desk or shelf that the amp sits on. I've reduce that component of the fan noise in my Titan 425 amps b
/archives//html/Amps/2012-06/msg00342.html (7,916 bytes)

364. Re: [Amps] Acoustic Noise Comparison (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 22 Jun 2012 09:17:46 -0700
I have always used cans for any serious operation with CW or SSB, but will often run on the speaker for digital modes and casual rag chews. 73, Jim K9YC ______________________________________________
/archives//html/Amps/2012-06/msg00375.html (8,723 bytes)

365. Re: [Amps] Acoustic Noise Comparison (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 22 Jun 2012 21:44:37 -0700
In that application it is acting as vibration isolation -- that is, its softness minimizes the VIBRATION coupled to the desk below. If you put a thick felt under the entire typewriter (rather than on
/archives//html/Amps/2012-06/msg00381.html (9,445 bytes)

366. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 06 Jul 2012 10:03:02 -0700
I get excellent results from an old standby 4x2 bow-tie with reflector. It's a broadband UHF antenna, but also gets enough high-band VHF signal that the set solidly decodes Ch 8 from about 40 miles a
/archives//html/Amps/2012-07/msg00041.html (8,047 bytes)

367. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 06 Jul 2012 17:58:04 -0700
There are relatively few full power DTV stations on Channels 2-6, a lot more on 7-13. A quick search of the FCC database will yield details. http://www.fcc.gov/encyclopedia/tv-query-broadcast-station
/archives//html/Amps/2012-07/msg00056.html (9,627 bytes)

368. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 06 Jul 2012 18:08:57 -0700
There is no such thing as a "ground loop" -- it is a totally false concept. The actual cause of the hum/buzz problems we blame on these imaginary "ground loops" are LEAKAGE CURRENT from the AC power
/archives//html/Amps/2012-07/msg00057.html (9,613 bytes)

369. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 06 Jul 2012 22:29:16 -0700
I lived and worked in Chicago at the time, was (and still am) an SBE member, knew many of the broadcast engineers. I am well aware of the facts. 73, Jim K9YC _________________________________________
/archives//html/Amps/2012-07/msg00076.html (9,906 bytes)

370. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 06 Jul 2012 22:33:03 -0700
Of course -- it's a continuous function, not a "step" function. :) 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm
/archives//html/Amps/2012-07/msg00077.html (9,565 bytes)

371. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 07 Jul 2012 12:20:42 -0700
So what? That doesn't change the engineering and economic basis for those decisions. Jim _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.
/archives//html/Amps/2012-07/msg00103.html (10,045 bytes)

372. Re: [Amps] Amplified TV Antenna (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Sat, 07 Jul 2012 12:29:04 -0700
You are forgetting the 90 MHz of spectrum between the top of Ch 6 (88 MHz) and the bottom of Ch 7 (174 MHz). It IS, indeed, a continuous function, the impulse noise DOES decay gradually with increasi
/archives//html/Amps/2012-07/msg00104.html (9,749 bytes)

373. Re: [Amps] K3 spike problem (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Thu, 16 Aug 2012 14:11:02 -0700
It should be noted that when high quality rigs like the K3 are used to drive a power amp, amplifier output power should be set by using just enough drive power, NOT by setting drive power higher and
/archives//html/Amps/2012-08/msg00258.html (9,447 bytes)

374. Re: [Amps] Multi-Amp w/ Power Combiners (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 24 Aug 2012 08:45:53 -0700
There is phase shift in ANY transmission line that is directly related to its electrical length (that is, as a fraction of a wavelength). Wavelength in the line is a function of frequency AND the vel
/archives//html/Amps/2012-08/msg00381.html (8,212 bytes)

375. Re: [Amps] MFJ products (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 11 Sep 2012 00:51:15 -0700
They ARE gone. Like RCA, GE, Altec Lansing, only the NAME is still around, purchased by someone with enough money to buy the the name or what's left of the company from the bankruptcy (or before the
/archives//html/Amps/2012-09/msg00190.html (11,317 bytes)

376. Re: [Amps] TenTec Titan 425 Idle Grid Current (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Wed, 26 Sep 2012 10:39:46 -0700
The Titan 425 can easily be run with one tube at a time to zero in on something like this. Just be careful with discharge of the high voltage as you go in. For quick tests, you don't need to replace
/archives//html/Amps/2012-09/msg00303.html (8,450 bytes)

377. Re: [Amps] Ten Tec Titan 425 Options (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 09 Nov 2012 08:52:09 -0800
I took it to Burghardt Radio Repair and Jim said the transformer was good, but most of the rest of the supply was toast. I believe him as he has always been fair and square with me. He said there was
/archives//html/Amps/2012-11/msg00073.html (13,047 bytes)

378. Re: [Amps] Ten-Tec Centurion Design Flaw? (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 04 Dec 2012 03:19:28 -0800
I'm only guessing, Jim, but maybe take a look at what else is being switched at the same time (like the inductors, and the output configuration). It is my understanding that Ten Tec amps are Pi-L onl
/archives//html/Amps/2012-12/msg00014.html (7,965 bytes)

379. Re: [Amps] Vacuum Relay (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Fri, 07 Dec 2012 13:00:18 -0800
More sturdy than what? Alpha told me they had been using Gigavac lately and like them. I've been using them for 4-5 years. I no longer use QSK, because I got tired of replacing them every few years (
/archives//html/Amps/2012-12/msg00030.html (8,018 bytes)

380. Re: [Amps] Fw: Ten-Tec Centurion Load Capacitance (score: 1)
Author: Jim Brown <jim@audiosystemsgroup.com>
Date: Mon, 10 Dec 2012 20:01:13 -0800
If it's like my Titans, it depends on how you align the front panel knob. 73, Jim K9YC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.co
/archives//html/Amps/2012-12/msg00061.html (8,053 bytes)

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