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1. [AMPS] Suppressor measurements (score: 1): Author: dhaupt@bewellnet.com (dhaupt@bewellnet.com); Date: Fri, 4 Aug 2000 00:18:04 +0000; It brightens my heart to see my employer's products presented so favorably! However, a Hewlett-Packard impedance meter is not required for measuring impedance, Q or any other passive parameter. Our i; /archives//html/Amps/2000-08/msg00121.html (9,572 bytes)
2. [AMPS] Power rectifiers as RF switches? (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Thu, 15 Jun 2000 21:56:02 -0700; measured of to the I have considered power diodes, too. For switching, you really can use any diode. However, diodes which are not optimum will lead to distortion or excess power dissipation (DC or R; /archives//html/Amps/2000-06/msg00206.html (10,111 bytes)
3. [AMPS] Re: Rich's article (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Tue, 07 Mar 2000 21:58:17 -0700; Rich, et al, I admit to being a pack rat when it comes to useful articles about RF amps. Especially if they seem to address a subject that comes up repeatedly on the reflector. Fred has brought up an; /archives//html/Amps/2000-03/msg00428.html (7,490 bytes)
4. [AMPS] DAF Spectrum plots (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Sat, 01 Jan 2000 10:55:42 -0700; Just an observation from looking at http://home3.swipnet.se/~w-30548/g2daf/pa5.gif I believe the spectrum analyzer controls were set improperly. The resolution bandwidth was set for 1 kHz. This is to; /archives//html/Amps/2000-01/msg00012.html (9,884 bytes)
5. [AMPS] Oxide heater lifetime (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Wed, 24 Nov 1999 23:56:06 -0600; Just a brief anecdotal observation relating to Bob Marston's post: In a commercial MRI amp which used both a YC-156 and a 3CPX800A7 (both oxide heaters), we started seeing tubes going soft at 18,000; /archives//html/Amps/1999-11/msg00477.html (7,704 bytes)
6. [AMPS] Re: HV on tubes w/o filament (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Fri, 02 Apr 1999 09:37:05 -0700; As the esteemed Mr. Ehrhorn said, when you hit the "off" switch, the sequence is usually that the bias supply goes to zero before the anode supply. The tube biases on, and the anode current bleeds do; /archives//html/Amps/1999-04/msg00036.html (8,705 bytes)
7. [AMPS] "Commercial" HV connectors and cable (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Tue, 19 Jan 1999 00:04:40 -0700; At a previous employer, we purchased a "commercial" hipot tester. I don't recall the manufacturer, but I believe it was Rod-L or Hipotronics. It was essentially a low current DC supply. You could twi; /archives//html/Amps/1999-01/msg00264.html (8,655 bytes)
8. [AMPS] 7/16th DIN connectors (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Sat, 23 Jan 1999 22:28:40 -0700; There is an RF connector variously known as a 7 - 16 DIN, a 7/16 DIN or merely a 7 - 16 or 7/16 connector. It is not 7/16th of an inch in any dimension. It has a 7mm diameter to the inner conductor a; /archives//html/Amps/1999-01/msg00354.html (7,594 bytes)
9. [AMPS] Tank coils and vector impedance meters (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Sat, 05 Dec 1998 11:33:11 -0600; phase quite so Peter's comments are correct regarding network analyzers used to measure impedance. A network analyzer measures the ratio between reflected and forward power, and therefore is optimize; /archives//html/Amps/1998-12/msg00064.html (8,825 bytes)
10. [AMPS] YC-156 grid current at zero B+ (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Mon, 07 Dec 1998 06:00:03 -0700; We tend to get accustomed to the zero-bias 3-500Z triode and get surprised at the grid voltages required in other tubes. I recommend using the 3CX15,000B7 grounded grid curves for your design work wi; /archives//html/Amps/1998-12/msg00115.html (8,551 bytes)
11. [AMPS] YC-156 oops (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Mon, 07 Dec 1998 06:21:36 -0700; Count me in the "doesn't necessarily read it thoroughly" group. Jay said "when the filaments come up", so that question was superfluous. -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissio; /archives//html/Amps/1998-12/msg00116.html (6,469 bytes)
12. [AMPS] High current filament circuits (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Wed, 11 Nov 1998 23:27:27 -0600; Scott, before abandoning crimps in favor of solder, or swapping out #10 for #2 welding wire, you should be able to actually measure where the drop is happening. On your bench arrangement, try baring; /archives//html/Amps/1998-11/msg00173.html (9,475 bytes)
13. [AMPS] Re: Pulse rating in vacuum tubes (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Fri, 17 Jul 1998 01:13:26 -0600; Bob, The key phrase in the "P" version of tubes is "caveat emptor". As Rich says, the pulse rated tubes often are different only in that a longer anode insulator allows for higher anode voltage. I be; /archives//html/Amps/1998-07/msg00098.html (8,289 bytes)
14. [AMPS] Re: 2500H (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Mon, 15 Jun 1998 21:58:54 -0600; Yes, Dan, that 5% means anywhere on the scale. So for a 2500 watt slug, it's +/- 125 watts, even if you're reading 100 watts. Your own measurement bear this out. On the 10 meter frequency, you had sl; /archives//html/Amps/1998-06/msg00166.html (8,069 bytes)
15. [AMPS] Spectrum Analyzers (score: 1): Author: dhaupt@bewellnet.com (Dave); Date: Fri, 01 May 1998 03:03:50 -0600; Oh, dear, I've kept my mouth shut so far on this reflector, but now you're on my primary business turf, so I'll butt in. We application engineers at HP entertian a whole lot of questions about spectr; /archives//html/Amps/1998-05/msg00008.html (8,997 bytes)

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