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1. Re: [Amps] 220V service for amplifier (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 04 Dec 2003 05:58:00 -0600; While I was president of Alpha/Power and involved in repair of Alpha 77 amps I asked Dick Ehrhorn why he had designed the amps with only a 3-wire AC connection and with a 120 VAC blower since this de; /archives//html/Amps/2003-12/msg00057.html (12,457 bytes)
2. Re: [Amps] Alpha 87A troubles with fault 17 (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 22 Jan 2004 05:10:36 -0600; Don't do emails when trying to sort out amp problems--it takes too long to get to the heart of the matter. It is much better to call the manufacturer. A two-way dialog usually discloses some sort of; /archives//html/Amps/2004-01/msg00223.html (9,626 bytes)
3. Re: [Amps] Horizontal or verticle? (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 28 Jan 2004 09:19:53 -0600; At 09:21 PM 1/27/2004, you wrote: Dear Sirs, What's a geode? The rock or the data analysis software? Rock--http://www.desertusa.com/magjan98/jan_pap/du_rock_geode.html Software--http://geode.usgs.gov; /archives//html/Amps/2004-01/msg00319.html (8,769 bytes)
4. Re: Re: [Amps] Horizontal or verticle? (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 29 Jan 2004 09:40:28 -0600; At 08:41 AM 1/29/2004, tongaloa@alltel.net wrote: In navigation and geodosy the geode is the equipotential(gravitational) reference. Not everything can be found with google ;-) -Bob ah7i Hi, Bob-- Su; /archives//html/Amps/2004-01/msg00342.html (9,315 bytes)
5. Re: [Amps] Horizontal or verticle? (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 29 Jan 2004 10:50:56 -0600; At 10:02 AM 1/29/2004, tongaloa wrote: Here's an example of geode in a sentence :-) http://www.gisdevelopment.net/aars/acrs/1989/i/geo002pf.htm And your reference is from a Malaysian science paper??; /archives//html/Amps/2004-01/msg00345.html (9,495 bytes)
6. Re: [Amps] Re: Amps Digest, Vol 13, Issue 52 (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 31 Jan 2004 21:36:15 -0600; At 04:56 PM 1/31/2004, K3vw@aol.com wrote: You can use a 3-500Z chimney with the 3CX1200A7, Ameritron does ! Willy K3VW So, if the Coleman lantern double mantle chimney works with a 4-400A and that i; /archives//html/Amps/2004-02/msg00000.html (7,558 bytes)
7. [Amps] Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sun, 01 Feb 2004 09:42:10 -0600; While at Alpha/Power I learned how easy it is to make the silicon rubber chimneys used in Alpha amps--the only real problem is finding a decent source for the material in small quantities. Just check; /archives//html/Amps/2004-02/msg00006.html (9,051 bytes)
8. Re: [Amps] Re: Amps Digest, Vol 13, Issue 52 (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Mon, 02 Feb 2004 09:40:42 -0600; Jim--here are a couple of places for chimneys -- one in the US and one in the UK. Just do a google search for coleman + lantern + chimney for lots of options. http://www.base-camp.co.uk/Wicks.htm htt; /archives//html/Amps/2004-02/msg00013.html (11,276 bytes)
9. Re: [Amps] tube cooling (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Wed, 18 Feb 2004 07:08:39 -0600; My experience had been that there were only TWO kinds of muffin fans that can be added to the back of an Alpha amp. 1) Quiet ones that make no difference in the actual temperature of the exhaust air.; /archives//html/Amps/2004-02/msg00165.html (10,139 bytes)
10. Re: [Amps] Chimney material (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Mon, 23 Feb 2004 06:47:37 -0600; I have always considered McMaster-Carr to be a "convenience store" operation. They had everything but their prices were high. And I have considered MSC (old Manhattan Supply) to be a lower cost suppl; /archives//html/Amps/2004-02/msg00212.html (8,220 bytes)
11. Re: [Amps] Chimney Material (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 26 Feb 2004 20:13:59 -0600; Ok guys I found a cheap place to get silicone rubber; NAPA, yes the auto parts supplier. They have gasket material 24"x12"x1/32" thick or thicker. for about 5.99 a box rolled up. It a little stiffer; /archives//html/Amps/2004-02/msg00270.html (9,303 bytes)
12. Re: [Amps] Switch-mode HV power supply (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sun, 14 Mar 2004 10:03:26 -0600; At 07:43 AM 3/14/2004, you wrote: Oleg... Can you provide a URL? Google could not find the site you mention. jeff, wa1hco The English translation version has a long URL--and it is a bit tough to read; /archives//html/Amps/2004-03/msg00151.html (8,756 bytes)
13. Re: [Amps] insulation (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Fri, 26 Mar 2004 06:43:28 -0600; The opposite example is that I once used Delrin for the PA tuning shaft in a little 6522 2m transmitter. The capacitor rotor was *supposed* to be at RF ground, and that TX couldn't have been putting; /archives//html/Amps/2004-03/msg00281.html (8,298 bytes)
14. Re: [Amps] Question about an old home-brew amp (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Thu, 08 Apr 2004 07:41:58 -0500; Chris-- Not going to be much help, but HP did build some HF power amps using the 3CX1000A7 for internal use in some of their industrial heating processes. Possibly this is a prototype and operational; /archives//html/Amps/2004-04/msg00059.html (11,467 bytes)
15. Re: [Amps] Dayton Blower Specs (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 29 May 2004 08:18:32 -0500; Easy--go to http://www.grainger.com In search Click on Manufacturer's Model Number and then type in 4C006B. Here is the data. I have used a lot of them in commercial applications and have had good r; /archives//html/Amps/2004-05/msg00258.html (8,070 bytes)
16. Re: [Amps] re cooling of coils (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Mon, 06 Sep 2004 09:02:19 -0500; The cure for that is to add the optional Muffin-type fan on the air inlet. It doesn't increase the total airflow much - its main purpose is to make the incoming air very turbulent, so the transformer; /archives//html/Amps/2004-09/msg00111.html (10,981 bytes)
17. [Amps] Dipped Mica Caps (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 11 Sep 2004 09:23:52 -0500; Don't see much of a selection for dipped mica caps in either the Newark or the Digi-Key catalogs. Where is the best place to buy the larger sizes of dipped micas these days. Larger physical sizes--fo; /archives//html/Amps/2004-09/msg00192.html (7,354 bytes)
18. Re: [Amps] ARCO compression trimmer caps (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 11 Sep 2004 10:08:56 -0500; If you DO want to make your own nuts you can get a tap for $7.75 from http://www.jtsmach.com/jtswebshop/Taps_Dies/T057.asp Of course this assumes that the thread is REALLY a 12-40. Surprised that ARC; /archives//html/Amps/2004-09/msg00197.html (9,223 bytes)
19. Re: [Amps] ARCO compression trimmer caps (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 11 Sep 2004 14:45:18 -0500; Hi John, "Quality Imports" .... that's an oxymoron. Those might be good enough to make a few nuts in brass. A local tool supply carries some of the odd sizes in "import quality" at about $3-4 ea. but; /archives//html/Amps/2004-09/msg00206.html (9,681 bytes)
20. Re: [Amps] knob & meter scales (score: 1): Author: W0UN -- John Brosnahan <shr@swtexas.net>; Date: Sat, 16 Oct 2004 19:15:38 -0500; Maybe this is what you want, George-- 73--John http://www.realhamradio.com/Meter.htm At 06:43 PM 10/16/2004, you wrote: Hi, I think I remember seeing some mention of a freeware program for designing; /archives//html/Amps/2004-10/msg00230.html (7,634 bytes)

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