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References: [ +from:Peter_Chadwick@mitel.com: 967 ]

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61. [AMPS] stupid question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 15 Mar 2001 13:24:00 -0000; Is the 'RCA' connector the same thing we call a 'phono plug'? The type of connector used on the Heathkit HW101 antenna connector, and I believe, either the KWM2 antenna connector or the 30L1 input co; /archives//html/Amps/2001-03/msg00137.html (7,297 bytes)
62. No subject (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 19 Mar 2001 08:30:01 -0000; Thanks to all those who answered the query on phono plugs. They are convenient, if not a particularly high class RF connector... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2001-03/msg00168.html (6,477 bytes)
63. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 22 Mar 2001 13:39:02 -0000; Of course, it could be that he just says what a lot of people think, and are too shy (polite?tactful?liking the avoidance of too much acrimony?) to say............ 73 Peter G3RZP -- FAQ on WWW: http:; /archives//html/Amps/2001-03/msg00190.html (9,532 bytes)
64. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 22 Mar 2001 17:06:44 -0000; I think the comments from Vic and Phil are good advice for any amp, not just the SB220, and additionally, it's one of the things worth checking yearly or so on amps already in service. Rich's metal o; /archives//html/Amps/2001-03/msg00194.html (9,567 bytes)
65. [AMPS] SB-220 Amplifiers and Garage Sales!! (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 23 Mar 2001 08:01:18 -0000; Something puzzles me here. If the suppressor provided the whole plate load impedance at the parasitic frequency, then the gain would be reduced by only 4.3dB by lowering the parallel resistance from; /archives//html/Amps/2001-03/msg00208.html (10,269 bytes)
66. [AMPS] 1KW from a pair of 4-65A's (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Mar 2001 09:24:12 +0100; I seem to remember an Eimac circuit that supposedly produced 300 -400w in ICAS from one 4-65A. Cleanliness unknown, and not in DAF. I suspect pretty dirty. It would be interesting to measure a DAF wi; /archives//html/Amps/2001-03/msg00265.html (7,172 bytes)
67. [AMPS] Additional Tube Brand Question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Feb 2001 12:53:51 -0000; Zeners are also, especially at voltages around 5.5 to 6.5 volts, far more temperature stable. In fact, at about 6 volts, they're pretty close to a zero temp co, while diodes have a -2mV/deg C temp co; /archives//html/Amps/2001-02/msg00007.html (8,220 bytes)
68. [AMPS] Additional Tube Brand Question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 1 Feb 2001 13:19:18 -0000; How useful is a bias voltage that wanders with temperature? If you have 10 diodes to get about 7 volts, that will reduce by over 1/4 volt for a 20 degree rise. Of course, the ZSAC may be so non criti; /archives//html/Amps/2001-02/msg00012.html (8,637 bytes)
69. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 2 Feb 2001 09:13:55 -0000; It's a good idea - I've done something similar for the antenna selection and auto antenna tuner control - but Bill, how do you get it all in one box? I've got two matching boxes about 12 inches wide; /archives//html/Amps/2001-02/msg00050.html (9,361 bytes)
70. [AMPS] 8877 Warm Up (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 5 Feb 2001 07:41:24 -0000; Isn't this one of the things that causes cathode interface impedance problems? I seem to remember that Millman and Straub's 'Pulse and Digital Circuits' has something about this in it. 73 Peter G3RZP; /archives//html/Amps/2001-02/msg00106.html (6,910 bytes)
71. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 5 Feb 2001 11:15:57 -0000; I feel that this applies to more than the SB220, and is desirable on any amplifier above the 500 watt or so level. Having said that, the cost when you're building a commercial amplifier has to be con; /archives//html/Amps/2001-02/msg00107.html (9,653 bytes)
72. [AMPS] SB-220: Operate/Standby Switch (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 5 Feb 2001 13:24:46 -0000; You know that. I know that. Probably everyone here knows that. Now convince the bean counters who generally have more say about what goes on in industry........oh, and the 'pointy haired bosses ' too; /archives//html/Amps/2001-02/msg00109.html (11,354 bytes)
73. [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)
74. [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)
75. [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)
76. [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)
77. [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)
78. No subject (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 6 Feb 2001 16:43:35 -0000; Quote from an add in the ham ads at QTH.com:- This 'Class C Linear Amplifier' really must be something!!! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting; /archives//html/Amps/2001-02/msg00151.html (6,677 bytes)
79. [AMPS] Roller Inductors vs. Bandswitches ... which is best? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 7 Feb 2001 08:34:39 -0000; Fair Radio Sales (http://www.fairradio.com/index.html) have ex BC375 switches at $3.95 or 10 for $32. They are on their 'special offer' page. These are big 1p 6way 30 degree indexing types, and they'; /archives//html/Amps/2001-02/msg00170.html (9,985 bytes)
80. [AMPS] beam "sweep" tube amplifiers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 7 Feb 2001 08:40:45 -0000; One point I found absolutely vital was a separate bias pot for each tube. For a given bias voltage, I've measured a plate current variation from 2.5 to 45 mA on sweep tubes - about twice the variatio; /archives//html/Amps/2001-02/msg00171.html (7,509 bytes)

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