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101. [Amps] Checking 12by7 (score: 127): Author: 2 at vc.net (2); Date: Sat Apr 12 08:47:11 2003; ? Quite true, but a precursory check with a high-potential tester can prevent a tube with a problem from being tried in and damaging the amplifier. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG; /archives//html/Amps/2003-04/msg00121.html (6,781 bytes)
102. [Amps] SB-220 - Plate Voltage and Plate current (score: 127): Author: 2 at vc.net (2); Date: Thu Apr 10 08:17:39 2003; With 240v/120v mains, the no-load potential in the SSB position is 3050V. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00096.html (7,201 bytes)
103. [Amps] modern 811 designs? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 7 16:44:47 2003; ? Even if only 6 are close, nobody could tell on the Rx end. ? nothing glows like tantalum. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00067.html (7,630 bytes)
104. [Amps] modern 811 designs? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 7 15:36:49 2003; ? Good idea, Bob. However, for those who want to use an inexpensive tube type, the 811 is an ok choice. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00066.html (12,203 bytes)
105. [Amps] modern 811 designs? (score: 127): Author: 2 at vc.net (2); Date: Mon Apr 7 13:42:31 2003; ? Close enough. With 1800v on the anodes, I calculate 590-ohms (?) of RL.. ? new math ? ? I can layout a 3 by 3 square for 8, 811As, including the anode choke that would need c. 8-inches of anode le; /archives//html/Amps/2003-04/msg00065.html (10,616 bytes)
106. [Amps] SB-200 HV meter problem (score: 127): Author: 2 at vc.net (2); Date: Sat Apr 5 09:21:31 2003; Good advice, George. However, 2w film-type resistors should be used. I would also add 3A glitch protection diodes across the 200uA meter movement. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6; /archives//html/Amps/2003-04/msg00040.html (9,245 bytes)
107. Fw: [Amps] modern 811 designs? (score: 127): Author: 2 at vc.net (2); Date: Sat Apr 5 06:31:53 2003; ? The problem is not grid-sag, it is filament sag when the filament is hot. The W-shaped filament sags no matter how it is oriented, but when the W is vertical, the filament-to-grid spacing is not a; /archives//html/Amps/2003-04/msg00033.html (10,654 bytes)
108. [Amps] SB220 - Voltage Doubler circuit headroom? (score: 127): Author: 2 at vc.net (2); Date: Sat Apr 5 05:59:04 2003; ? The actual peak inverse potential in each leg of a SB-220 hv supply is c. 3100v with a 120vac or 240vac mains potential. The total piv of each leg should be c. 50% higher to provide a safety factor; /archives//html/Amps/2003-04/msg00032.html (6,773 bytes)
109. [Amps] modern 811 designs? (score: 127): Author: 2 at vc.net (2); Date: Fri Apr 4 13:16:13 2003; ? this should be an interesting project, Dan. If I were going to build an 811A amplifier, I would use c. eight tubes in parallel since an 811A's anode-dissipation is only 65w. This would yield 520w; /archives//html/Amps/2003-04/msg00023.html (9,159 bytes)
110. [Amps] Heatkit hl-2200 questions (score: 127): Author: 2 at vc.net (2); Date: Thu Apr 3 10:16:32 2003; ? c, 11db on the ssb tap. ? c. 650mA ? c. 180mA on ssb-tap. ? yes ? 6m requires major surgery. ? there is an article about the SB-220 on my Web site. cheers, Isaac - R. L. Measures, a.k.a. Rich...,; /archives//html/Amps/2003-04/msg00015.html (7,564 bytes)
111. [Amps] Plate Chokes (score: 127): Author: 2 at vc.net (2); Date: Thu Apr 3 08:29:22 2003; An 813's grid-resonance and screen-resonance are above its f-max of 30MHz, which is probably why I have not yet heard about a parasite with the 813 in g-g config. -- (4) 813s is a good choice for SSB; /archives//html/Amps/2003-04/msg00013.html (6,890 bytes)
112. [Amps] Coil dimension (score: 127): Author: 2 at vc.net (2); Date: Tue Apr 1 11:00:22 2003; A calibrated L-meter is more accurate than any simulation program. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-04/msg00006.html (7,576 bytes)
113. [Amps] Re: National R-175 Choke (score: 127): Author: 2 at vc.net (2); Date: Sat Mar 29 05:39:11 2003; ** Ni-Cr has too much DC-R for use in RF-chokes. Cu has c. 50-times better DC conductivity. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00917.html (6,545 bytes)
114. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Fri Mar 28 11:04:53 2003; ** please describe one of these ways. Thanks. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00908.html (8,531 bytes)
115. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 22:09:35 2003; ** I have autopsied 6 gold-sputtered 8877s from HF amplifiers that used the Eimac 135305 grid-grounding collet. [ref Figure 24 on my Web site] The inductance of an 8877 grid + base flange appears to; /archives//html/Amps/2003-03/msg00901.html (9,822 bytes)
116. [Amps] Fixed Vacuum Cap (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 22:09:19 2003; 4pF /20kV can easily be made from a few cm of RG-213/u. - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00900.html (6,630 bytes)
117. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 18:23:01 2003; ** They present a low Rp to the anode at vhf. ** A high Q suppressor shifts the dissipative burden onto R-sup that a L-sup made with resistance-wire would have have otherwise dissipated. In other wo; /archives//html/Amps/2003-03/msg00896.html (11,670 bytes)
118. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 18:22:49 2003; ** tnx, Merv. With g-g config, the 4-1000A's pesky screen resonance at c.25MHz would not cause much a problem since the control-grid would still shield the input from the output. How much anode ps p; /archives//html/Amps/2003-03/msg00895.html (9,268 bytes)
119. [Amps] TenTec+Nichrome (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 17:53:09 2003; ** So even though Ten-Tec knew that low-Q vhf suppressors damage amplifiers, they used them on their new amplifier? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00893.html (8,383 bytes)
120. [Amps] Parasites (parasitics) (score: 127): Author: 2 at vc.net (2); Date: Thu Mar 27 15:08:13 2003; at 10 ** How much L was added? Was it grounded-grid - or grid-driven? - R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2003-03/msg00885.html (8,935 bytes)

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