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Total 80 documents matching your query.

41. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Mon, 5 Feb 2001 06:48:40 -0800; Consider that the price of a 25w rheostat is under $6. Filament/heater voltage is critical to transmitting tubes. How many amplifiers use a rheostat to control filament/heater voltage?. considered -; /archives//html/Amps/2001-02/msg00115.html (11,824 bytes)
42. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: oz1pif@get2net.dk (Peter Frenning, OZ1PIF); Date: Mon, 5 Feb 2001 15:11:50 +0100; -- Original Message -- From: "Bob Marston" <k1ta@contesting.com> To: "measures" <2@vc.net> Cc: "Peter Chadwick" <Peter_Chadwick@mitel.com>; "amps" <amps@contesting.com> Sent: Monday, February 05, 200; /archives//html/Amps/2001-02/msg00117.html (10,628 bytes)
43. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: ac6tk@cybertime.net (J. Bradshaw); Date: Mon, 5 Feb 2001 08:34:50 -0800; It only makes good sense to design with the painful realization that 90% of your customers want something for nothing. That means 2 or 3 high end display models and a conveyor belt for the "affordabl; /archives//html/Amps/2001-02/msg00119.html (12,194 bytes)
44. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Wt8r@aol.com (Wt8r@aol.com); Date: Mon, 5 Feb 2001 11:49:17 EST; why For Peter, US engineers aren't paid enough to be able to drive Mercedes like their bosses do. Hi!! 73 de Dave, WT8R -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.; /archives//html/Amps/2001-02/msg00120.html (10,179 bytes)
45. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: RMcGraw@InfoAve.Net (Bob & Linda McGraw K4TAX); Date: Mon, 05 Feb 2001 11:24:57 -0800; If I paid that much for an automobile I'd have to drive it 15 years too. Instead, I pay 1/3 that much and drive it 5 years. So, as I see it, I end up with a new car, with all the newest style and lat; /archives//html/Amps/2001-02/msg00121.html (11,195 bytes)
46. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: N6BUU@aol.com (N6BUU@aol.com); Date: Mon, 5 Feb 2001 13:49:21 EST; << Good engineering is often cheaper in the long run. when the "BEST WAY" COST'S MORE, THE PRICE GOES UP! remember when john glenn first went into space. sitting on the top of this rocket, he realize; /archives//html/Amps/2001-02/msg00122.html (9,444 bytes)
47. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 08:50:29 -0000; Yes. Which is why in a home brew amp, you'd fit one, without argument. In the commercial world, $6 on a component is at least $12 on the ex-works price. In the case of a variable or preset control, w; /archives//html/Amps/2001-02/msg00126.html (10,208 bytes)
48. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Tue, 6 Feb 2001 03:44:53 -0800; Collins Radio managed to use one in the KWS-1. wasting a $650 8877 for lack of spending $6 is bananas. $700 crapper seats, et cetera is how the military-industrial complex conceals "black project" f; /archives//html/Amps/2001-02/msg00127.html (10,352 bytes)
49. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 12:07:56 -0000; Depends on whose bottom line you're thinking of. Unless it can be shown that the tube consistently failed within its guarantee period because of the lack of a rheostat, bottom line says 'don't fit it; /archives//html/Amps/2001-02/msg00128.html (11,363 bytes)
50. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 6 Feb 2001 08:58:02 -0500; Hi Peter, My "spam" filter made me miss most of this, but I should add a few comments. Of course Rich always leaves a few things out. 1.) There would have to be some reasonable assurance lack of a rh; /archives//html/Amps/2001-02/msg00129.html (14,890 bytes)
51. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 14:18:42 -0000; That's where the rheostat comes in handy - assuming proper proportions, it limits surge current. Of course, so does a suitably designed surge limiting filament transformer, but that can be a bit more; /archives//html/Amps/2001-02/msg00131.html (10,360 bytes)
52. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 6 Feb 2001 09:39:46 -0500; Not really, a suitable current limiting transformer costs LESS than a transformer that allows excessive starting current. You do have to allow for temperature rise, however, and not box it in. Oh su; /archives//html/Amps/2001-02/msg00132.html (10,115 bytes)
53. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 14:48:21 -0000; have you looked at the accuracy of these cheap digital voltmeters? The ones I've seen were remarkably good...with no RF around. can you prove it was that? Did it repeat on the replacements? As a perc; /archives//html/Amps/2001-02/msg00134.html (9,817 bytes)
54. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: paulc@mediaone.net (Paul Christensen); Date: Tue, 6 Feb 2001 09:50:14 -0500; However, most commercial amps, including every commercial transmitter in the AM/FM broadcast industry use a rheostat to control filament voltage. In commercial applications, it's common practice to; /archives//html/Amps/2001-02/msg00135.html (16,311 bytes)
55. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 14:55:13 -0000; Extrapolation - the result of adding one feature after another. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST; /archives//html/Amps/2001-02/msg00137.html (9,227 bytes)
56. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Wt8r@aol.com (Wt8r@aol.com); Date: Tue, 6 Feb 2001 10:23:06 EST; (Commercial the you Peter, You really DO understand the Military Procurement system. I worked for the Air Force for 30 years as an electronics engineer. I designed & built custom instrumentation syst; /archives//html/Amps/2001-02/msg00139.html (10,545 bytes)
57. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 6 Feb 2001 09:41:09 -0600; Amen, Paul. We are prolonging emisson here. An added bonus of a resistor/rheostat in the primary of the filament transformer is a bit of inrush protection that is there all the time. In some of Henr; /archives//html/Amps/2001-02/msg00140.html (10,052 bytes)
58. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Tue, 6 Feb 2001 09:50:36 -0600; That is why the wattmeter should be looked at when adjusting filament voltage...to make sure the emission is not being reduced. A lot of ham shacks I've seen have modest a.c. wiring with long runs b; /archives//html/Amps/2001-02/msg00142.html (9,627 bytes)
59. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Tue, 6 Feb 2001 08:05:25 -0800; not in the real world In the SB-220 and TL-922, the T/R orig. relay is too slow for T/R with modern radios.. cheers, Peter - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://; /archives//html/Amps/2001-02/msg00143.html (9,509 bytes)
60. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: 2@vc.net (measures); Date: Tue, 6 Feb 2001 08:05:23 -0800; With 8877s, most of the failures have been from gold-sputtering. please see Figure 24 on Web site. Especially so with filament-type tubes. For heater-type tubes, the problem with excessive heater vo; /archives//html/Amps/2001-02/msg00145.html (17,664 bytes)

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