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61. Re: [Amps] Trouble in pileups? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 11:14:16 +0000; It's a bright emitter - 15V/165A Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00241.html (6,759 bytes)
62. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 12:23:45 +0000; I can see that gives you a 'standard' design for any given plate load impedance - not necessarily for a specific tube. Depending on the frequency and excess gain to be killed, it might not be necessa; /archives//html/Amps/2006-03/msg00243.html (9,163 bytes)
63. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 10 Mar 2006 21:19:21 +0000; Depending on how much energy and at what frequency, it might not need to get that hot at 29MHz. If you can't make the measurements, then it's better to play safe - but that can be an open door for fo; /archives//html/Amps/2006-03/msg00252.html (8,634 bytes)
64. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 13 Mar 2006 08:07:16 +0000; I think that should be ...(Rp/Xp)*2] Rp=(Rs^2+Xs^2)/Rs. If my rusty maths serves me, when Xs<Rs increasing Rs increases Rp. Steve _______________________________________________ Amps mailing list Amp; /archives//html/Amps/2006-03/msg00318.html (8,471 bytes)
65. Re: [Amps] Parasitic Suppressor 4-1000A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 13 Mar 2006 10:34:18 +0000; Sure, there's lots of things to take into account, but the ac analysis rules remain the same. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2006-03/msg00320.html (8,177 bytes)
66. Re: [Amps] Threads - was idiocy - perhaps it still is (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 15 Mar 2006 15:36:03 +0000; Any chance you can bring some back next time? When I was in San Jose a long time back, I could get Felinfoel 'Hercules' ale of similar strength and quality. At the time I lived half an hour from the; /archives//html/Amps/2006-03/msg00389.html (9,102 bytes)
67. Re: [Amps] Big transformer request TSPA (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 22 Mar 2006 07:34:41 +0000; Lots. I bet the transformer would fry. You can model both modes in the Duncan Amps PSU designer prog, and get a value for rms and peak transformer current - although you might have to invent a new di; /archives//html/Amps/2006-03/msg00590.html (7,642 bytes)
68. Re: [Amps] more on heavy transformers TSPA (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 22 Mar 2006 21:35:40 +0000; I try to remember to carry a pocket meter - it's really handy to check the secondary resistance(s), which will often tell you a transformer is designed for choke input use, and save a lot of frustrat; /archives//html/Amps/2006-03/msg00599.html (7,324 bytes)
69. Re: [Amps] CD Cap (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 25 Mar 2006 16:03:41 +0000; It's worth caring because of the nuisance if your transformer dies. Any replacement you find is bound to be 1" too big somewhere. If a transformer is intended for choke input operation, the secondar; /archives//html/Amps/2006-03/msg00661.html (8,452 bytes)
70. Re: [Amps] tube C + stray C (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 26 Mar 2006 07:31:26 +0100; I've done the same with various tubes - glass, big and small ceramic and I always see the same as you, actual total C is about twice what's in the tube itself. Steve _________________________________; /archives//html/Amps/2006-03/msg00671.html (7,100 bytes)
71. Re: [Amps] Need some 220K 2 watt carbon resistors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 27 Mar 2006 07:40:12 +0100; For sure you want something better than carbon comp anywhere near ht of any sort. I'm hard pushed to think of any situation where metal film aren't better. Steve _____________________________________; /archives//html/Amps/2006-03/msg00681.html (7,810 bytes)
72. Re: [Amps] measuring secondary resistance TSPA (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 27 Mar 2006 09:33:31 +0100; choke-input-filter designed transformer? Sorry for the very late reply. Other distractions, and searching for a notes of measurements, which I've failed to locate. Turning to ones kicking around in r; /archives//html/Amps/2006-03/msg00682.html (7,907 bytes)
73. Re: [Amps] TL922A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 02 Apr 2006 10:18:55 +0100; The one I have appears to be 2x47R in parallel. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00007.html (6,572 bytes)
74. Re: [Amps] TL922A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 02 Apr 2006 11:35:21 +0100; 24.9 ohms. It's the one you send me to characterise. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00009.html (7,767 bytes)
75. Re: [Amps] TL922A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 03 Apr 2006 07:52:49 +0100; Yes, they might have larger surface area, but they're still carbon comp, which is a fundamental flaw. Heat will change their value - not just running on 10m, but conducted and radiated heat from the; /archives//html/Amps/2006-04/msg00018.html (7,426 bytes)
76. Re: [Amps] TL922A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 03 Apr 2006 10:13:02 +0100; Out of interest, I've just measured the original, then swapped the resistors for a Dow Corning FP2 22R. I measured up to 200MHz, and the difference between them is less than the thickness of the trac; /archives//html/Amps/2006-04/msg00020.html (8,319 bytes)
77. Re: [Amps] New Transless solid state amp will be available soon (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 04 Apr 2006 07:28:14 +0100; I hope none of my neighbours get one! Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-04/msg00031.html (6,809 bytes)
78. Re: [Amps] The ongoing 4CX250B verbage! (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 04 Apr 2006 10:26:18 +0100; I reckon it's also a good apprenticeship. If you encounter the quirks that 4CX250s can throw at you, you'll learn a lot about tube amplifier design. Over here, you can buy them for the price of a bee; /archives//html/Amps/2006-04/msg00032.html (7,466 bytes)
79. Re: [Amps] The ongoing 4CX250B verbage! (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 04 Apr 2006 11:03:46 +0100; Crikey! The pair I ran on 2m came close to the figures STC give in their specs. - -30dBc 3rd order and -50dBc 5th order, at 550-600W pep from the pair. Steve _________________________________________; /archives//html/Amps/2006-04/msg00035.html (7,534 bytes)
80. Re: [Amps] rolling your own (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 04 Apr 2006 18:28:36 +0100; Another way to try is to secure one end of the wire in a sturdy vice, put the other end through the hole in your former, lean against the wire with your body weight to get some tension, the roll the; /archives//html/Amps/2006-04/msg00054.html (7,824 bytes)

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