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21. [Amps] L networks in Amplifiers (score: 1): Author: 2@vc.net (2); Date: Thu, 16 Jan 2003 10:41:26 -0800; Less Q means less Z transformation ratio. A Q of 2.5 might be ok for a tube with a RL of 300-ohms and a 50-ohm antenna. Eimac recommends aminimum Q of 10. Compared to a Pi, harmonic reduction is typ; /archives//html/Amps/2003-01/msg00131.html (7,514 bytes)
22. [Amps] New 4-1000A and New Amp design in works (score: 1): Author: 2@vc.net (2); Date: Thu, 16 Jan 2003 11:06:22 -0800; Triton needs to send one of their engineers to enroll in a sheet metal shop class. I took one and we learned that good spotwelds are not sound unless they look like some of the metal has melted. In; /archives//html/Amps/2003-01/msg00132.html (7,887 bytes)
23. [Amps] New 4-1000A and New Amp design in works (score: 1): Author: 2@vc.net (2); Date: Thu, 16 Jan 2003 13:08:37 -0800; The spotwelds on Eimac/Salt Lake tubes looked good. The welds eventually failed. The welds on Chinese 3-500s do not look as good but they do not fail. - R. L. Measures, a.k.a. Rich..., 805.386.3734,; /archives//html/Amps/2003-01/msg00133.html (7,555 bytes)
24. [Amps] Some Suggestions Please (score: 1): Author: 2@vc.net (2); Date: Fri, 17 Jan 2003 08:28:37 -0800; ^^ The rub is when the choke is being operated near a self-resonance. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-01/msg00140.html (8,343 bytes)
25. [Amps] Amp Problem (score: 1): Author: 2@vc.net (2); Date: Fri, 17 Jan 2003 08:28:41 -0800; ^^ I would: Measure the accuracy of both DC current meters. Determine the TX cathode-grid bias V with zero signal. To: <amps@contesting.com> - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.v; /archives//html/Amps/2003-01/msg00141.html (7,138 bytes)
26. [Amps] EIMAC 3CX1200 (score: 1): Author: 2@vc.net (2); Date: Sat, 18 Jan 2003 14:43:29 -0800; It's likely. The 3cx1200Z7 has 1/10 as much feedback C, which was The major drawback to the 3cx1200A7 in g-g amplifier service. However, for building a reliable VHF oscillator, the A7 would clearly b; /archives//html/Amps/2003-01/msg00157.html (6,765 bytes)
27. [Amps] relays (score: 1): Author: 2@vc.net (2); Date: Sat, 18 Jan 2003 14:52:16 -0800; I would replace it with a modern Au-Rh contacts. RF reed relay such as the Matsushita RSD. What coil V is needed? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-01/msg00158.html (7,804 bytes)
28. [Amps] Clipperton L (score: 1): Author: 2@vc.net (2); Date: Mon, 20 Jan 2003 18:20:50 -0800; More C. A pi-network input needs a Q of c. 2.In other words, the reactance of C-in needs to be 20 - 25 -ohms. Pi-networks do not dip because they are two L-networks in series -- i.e., they are a Z t; /archives//html/Amps/2003-01/msg00169.html (7,614 bytes)
29. [Amps] Re: AB1 v. AB2 (score: 1): Author: 2@vc.net (Rich); Date: Sun, 1 Dec 2002 09:12:19 -0800; ** What stops DC grid-current from flowing through such resistors whenever the grid is driven positive? - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-12/msg00005.html (7,885 bytes)
30. [Amps] 811A's & Bias (score: 1): Author: 2@vc.net (Rich); Date: Sun, 1 Dec 2002 09:25:25 -0800; Depends on anode supply V. What is necessary for linear operation with thoriated-tungsten cathodes is a Zero Signal Anode Current (ZSAC) of c. 20% of maximum-signal anode current. Yes and zeners are; /archives//html/Amps/2002-12/msg00006.html (7,027 bytes)
31. [Amps] Re: AB1 v. AB2 (score: 1): Author: 2@vc.net (Rich); Date: Sun, 1 Dec 2002 12:15:26 -0800; ** is the polarity ever other than negative.? - Does the grid supply regulate the level or allow the operator to adjust the level? - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-12/msg00009.html (7,716 bytes)
32. [Amps] Re: AB1 v. AB2 (score: 1): Author: 2@vc.net (Rich); Date: Sun, 1 Dec 2002 17:21:42 -0800; ** Eimac rates the maximum permissable grid bias ps source resistance for its tetrodes and pentodes. This determines how much grid-current can flow. In my experiences with AB1, there is a tradeoff i; /archives//html/Amps/2002-12/msg00011.html (10,145 bytes)
33. Fw: Re: [Amps] Re: AB1 v. AB2 (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 02:09:04 -0800; Skipp: Non-standard attribution (:) marks do not work as well as (>). - True, but this discussion group is about RF amplifiers. RR Like unto wearing football shoes to play a basketball game. Good fo; /archives//html/Amps/2002-12/msg00022.html (10,406 bytes)
34. [Amps] Re: AB1 v. AB2 (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 07:07:35 -0800; to ** How ? much - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-12/msg00027.html (11,959 bytes)
35. [Amps] MFJ inrush current protector? (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 07:16:36 -0800; A step-start can be added internally with one dpdt relay and two 20-ohm, 5w ww resistors. See Figure 1 on my Web site. As for the surge-protection 'feature', smallish cheapo MOVs are often proffered; /archives//html/Amps/2002-12/msg00028.html (8,690 bytes)
36. [Amps] MFJ inrush current protector? (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 08:22:29 -0800; Amen, Peter. I have two extra 120v MOVs with Cu strap leads. The price is 2 for $10 including postage. 2 are needed for a 240v line. - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-12/msg00030.html (7,704 bytes)
37. [Amps] MFJ inrush current protector? (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 09:21:03 -0800; Thermistors are inrush I limiters, (voltage) surge protectors are either avalanche diodes or metal oxide varistors. - Rich..., 805.386.3734, www.vcnet.com/measures.; /archives//html/Amps/2002-12/msg00032.html (9,329 bytes)
38. [Amps] MFJ inrush current protector? (score: 1): Author: 2@vc.net (Rich); Date: Mon, 2 Dec 2002 14:03:16 -0800; ** to add a step-start in my 922, I spent c. $3 for two, 20-ohm ww resistors. The step-start relay was the old T/R relay that was left over from the high-speed switching mod. ** The all-time record; /archives//html/Amps/2002-12/msg00034.html (8,861 bytes)
39. [Amps] Q: Chimneys for 3-500/4-400?? (score: 1): Author: 2@vc.net (Rich); Date: Tue, 3 Dec 2002 10:05:08 -0800; The work-around is to plagiarize the split-chassis transverse 6" fan cooling system used in the Heath SB-220. The glass envelopes will run way cooler, the amp will run quieter, and there will be no e; /archives//html/Amps/2002-12/msg00042.html (8,661 bytes)
40. [Amps] Q: Chimneys for 3-500/4-400?? (score: 1): Author: 2@vc.net (Rich); Date: Tue, 3 Dec 2002 13:23:04 -0800; Gone with the wind. To meet Eimac's pressure spec for the air system socket one needs a high-pressure blower -- something that I have never seen in an inexpensive blower. High pressure blowers typic; /archives//html/Amps/2002-12/msg00047.html (8,705 bytes)

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