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81. [AMPS] Dihydrogrn monoxide (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 12 Sep 1997 16:14:22 +0100; room Stu, they do all sort of funny things in California. The Granola State - take away the fruit and nuts and your left with the flakes! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampf; /archives//html/Amps/1997-09/msg00270.html (7,082 bytes)
82. [AMPS] cores (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 12 Sep 1997 16:50:20 +0100; What's the general feeling about toroidal dust iron cores in tank circuits? I know some manufacturers seem to use them just fine at the 1500 watt level: I've always felt a bit dubious, but that may b; /archives//html/Amps/1997-09/msg00273.html (7,160 bytes)
83. [AMPS] The Blues (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 15 Sep 1997 10:27:19 +0100; Ron, AB6ZX, If the blue glow is restricted to the envelope, you might restore it by Carls method. Even if the glow is between the electrodes, you might still restore it by Carl's method. But I wouldn; /archives//html/Amps/1997-09/msg00297.html (7,348 bytes)
84. [AMPS] atmosphere (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 15 Sep 1997 10:41:17 +0100; Depends on how much gas. Things like 826's can be very spectacular - they leak like sieves - and you can literally get a cloud of smoke as soon as you power up the filament as it burns away. Some ma; /archives//html/Amps/1997-09/msg00298.html (7,588 bytes)
85. [AMPS] Dihydrogen monoxide (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 17 Sep 1997 10:04:55 +0100; Bill The real reason is that over here, beer is drinkable at room temperature, and if supplied for analysis, will not produce the response 'that mare isn't fit for work'. 73 Peter G3RZP -- FAQ on WWW; /archives//html/Amps/1997-09/msg00314.html (7,454 bytes)
86. [AMPS] doorknobs (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 4 Aug 1997 10:00:23 +0100; Try Dayton. Although there isn't always a good supply of all values, but I found 25, 50 and 500pf 858's at $1 in the flea market this year. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/amp; /archives//html/Amps/1997-08/msg00029.html (6,984 bytes)
87. [AMPS] RE: grid disippation (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 8 Aug 1997 15:47:33 +0100; Rich, you say:- I readily admit I don't understand this. Can you elucidate what the various current paths are, and where this value of current comes from? Puzzled. 73 G3RZP -- FAQ on WWW: http://www.; /archives//html/Amps/1997-08/msg00077.html (6,896 bytes)
88. [AMPS] RE: grid dissipation (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 8 Aug 1997 16:49:54 +0100; Rich, Thanks for the explanation - I didn't have any info on the Cgp to hand. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative reque; /archives//html/Amps/1997-08/msg00081.html (6,639 bytes)
89. [AMPS] grid dissipation (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 11 Aug 1997 11:01:07 +0100; Sorry Tom, I don't agree. In a class B stage, (and the same pretty well applies to a Class AB stage) the second harmonic component of plate current is about 6dB down on the fundamental - see Pappenfu; /archives//html/Amps/1997-08/msg00104.html (8,999 bytes)
90. [AMPS] ferrite beads (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 22 Aug 1997 09:14:25 +0100; G3RZP says : I've never had success with ferrite beads as parasitic suppressors in tube PA's, either. One place I worked had used them successfully on a PA with 3 off 6146. Then the manufacturer chan; /archives//html/Amps/1997-08/msg00162.html (7,303 bytes)
91. [AMPS] parasitics (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 22 Aug 1997 11:30:42 +0100; Rich suggests small resistors for MOSFET parasitic suppression. I agree - I've found that approach far more reliable in production, and cheaper. They also work well on small triodes in cathode follow; /archives//html/Amps/1997-08/msg00165.html (7,308 bytes)
92. [AMPS] parasitics in VHF amplifiers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 27 Aug 1997 10:44:54 +0100; of Amen to that. I'd even consider using a Pi-L, bearing in mind that according to Part97.307(e) requires all spurious emissions in the band 30 to 225 MHz to be at least 60dB down. Of course, a low p; /archives//html/Amps/1997-08/msg00197.html (7,361 bytes)
93. [AMPS] IMD rel PEP? (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 28 Aug 1997 09:27:53 +0100; As a minor point of interest, where the ITU(R) talks about intermodulation products (in recommendations SM326 and SM328), they talk in terms of products down relative to PEP, not relative to either t; /archives//html/Amps/1997-08/msg00225.html (7,005 bytes)
94. [AMPS] Perfect amplifier (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 28 Aug 1997 16:29:47 +0100; If there was a perfect amplifier, it would take away the whole raison d'etre for this reflector, all our fun, and even worse, an activity which gives us all a chance to learn. It might be possible to; /archives//html/Amps/1997-08/msg00229.html (7,266 bytes)
95. [AMPS] IMD - HELP! (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 1 Jul 1997 10:03:00 +0100; Gentlemen, An appeal for help - I need your comments. ITU Recommendation SM329 on spurious and unwanted emissions is currently being revised, and the idea is being introduced that the spurious emissi; /archives//html/Amps/1997-07/msg00000.html (7,392 bytes)
96. [AMPS] Rocky Point effect (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Thu, 3 Jul 1997 09:45:00 +0100; W8JI, Tom, asked ' what is Rocky Point effect?' It was first noticed in the mid to late 1920's at the (then) new Rocky Point, Long Island of, I believe, RCA, although it might have been AT&T. They fo; /archives//html/Amps/1997-07/msg00005.html (8,186 bytes)
97. [AMPS] Power measurement (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 9 Jul 1997 13:24:00 +0100; A professional accredited laboratory doing type approval needs to be able to measure power conducted to a load to within +/-5%, and that's not that easy. Rich makes a very good point that shouldn't b; /archives//html/Amps/1997-07/msg00035.html (6,973 bytes)
98. [AMPS] 4-250 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 16 Jul 1997 09:33:00 +0100; Tree N6TR, Fine on your linear. The 4-250As work fb. I found that I got better linearity running in Class AB2, with a 200 ohm grid swamping resistor, and a 4:1 transmission line transformer. By makin; /archives//html/Amps/1997-07/msg00108.html (7,871 bytes)
99. [AMPS] 4-250A (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 16 Jul 1997 17:04:00 +0100; rich asks: It peaks about 25mA, as I remember it. As the amp was built for AB1, and changed after I put a spec an on it and had a fit, I don't have a grid current meter. It has negative feedback with; /archives//html/Amps/1997-07/msg00110.html (7,130 bytes)
100. [AMPS] 4-1000 (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 18 Jul 1997 09:22:00 +0100; Lane, Are you looking to run these guys as a linear, or as plate modulated am? If the latter, then you'll be pushing the vacuum variables if you run 5KV on the plates, since at full modulation, the p; /archives//html/Amps/1997-07/msg00117.html (8,056 bytes)

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