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181. [Amps] Tank tweaking - plate choke (score: 1): Author: 2@vc.net (2); Date: Mon, 23 Sep 2002 02:52:49 -0700; ** A means of analyzing a HV-RFC is to calculate the RF circulating current through the choke at the lowest frequency of operation, and see if the total current burden on the choke seems reasonable.; /archives//html/Amps/2002-09/msg00201.html (8,596 bytes)
182. [Amps] BTI BANDSWITCH (score: 1): Author: 2@vc.net (2); Date: Mon, 23 Sep 2002 12:57:40 -0700; ** Replacement bandswitch: Multi-tech Industries; 64 So. Main or PO Box 159; Marlboro, NJ 07746; 732-462-6100 < www.multi-tech-industries.com > ; Attn: Skip Coleman. - Reducing the VHF-Q of the paras; /archives//html/Amps/2002-09/msg00209.html (7,596 bytes)
183. [Amps] Legal Limit Amps using 4CX250B tubes (score: 1): Author: 2@vc.net (2); Date: Mon, 23 Sep 2002 16:12:01 -0700; It would take 4, minimum -- but there are none I know of. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00216.html (7,393 bytes)
184. [Amps] 4CX250F Tubes (score: 1): Author: 2@vc.net (2); Date: Mon, 23 Sep 2002 16:13:55 -0700; On SSB/CW, yes. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00217.html (7,120 bytes)
185. [Amps] BTI BANDSWITCH (score: 1): Author: 2@vc.net (2); Date: Mon, 23 Sep 2002 16:32:19 -0700; To: <amps@contesting.com> HF energy would not arc this switch. The culprit is apparently VHF energy. see http://WWW.VCNET.COM/measures/BTI.bsw,JPG - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K; /archives//html/Amps/2002-09/msg00218.html (8,175 bytes)
186. [Amps] RF Grid Current (score: 1): Author: 2@vc.net (2); Date: Tue, 24 Sep 2002 08:36:20 -0700; ** Grids are usually rated in watts, not mA. ** Grids consist of many conductors in parallel - which results in a low RF-R. Even though the anode-to-screen - or anode-to-grid circulating may be quit; /archives//html/Amps/2002-09/msg00226.html (8,636 bytes)
187. [Amps] Legal Limit Amps using 4CX250B tubes (score: 1): Author: 2@vc.net (2); Date: Wed, 25 Sep 2002 08:39:01 -0700; The FCC power limit on amateur stations is typically enforced in instances where interference is an ongoing problem. I know of two instances where more than 1650W pep (the cutoff) was measured by the; /archives//html/Amps/2002-09/msg00242.html (9,893 bytes)
188. [Amps] transformer oil (score: 1): Author: 2@vc.net (2); Date: Thu, 26 Sep 2002 09:13:06 -0700; ** I used 5w Mobile-1 synthetic engine oil in a 500W 50-ohm RF termination and it worked satisfactorily. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00251.html (7,044 bytes)
189. [Amps] Clipperton L lamps (?) (score: 1): Author: 2@vc.net (2); Date: Fri, 27 Sep 2002 04:22:54 -0700; To make a 330 lamp last longer, reduce the applied potential from 12 v tp c. 10v. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-09/msg00257.html (8,051 bytes)
190. [Amps] X-ray dangers from amplifiers? (score: 1): Author: 2@vc.net (2); Date: Sat, 28 Sep 2002 16:23:40 -0700; ** <11kV is supposedly safe, unless the tube is gassy -- i.e., the anode conducts via gas when the grid is in the cutoff region and the tank swings positive. Thus, one can have current flow at c. 19k; /archives//html/Amps/2002-09/msg00266.html (7,870 bytes)
191. [Amps] SB200 - RFC2 Replacement? (score: 1): Author: 2@vc.net (2); Date: Sun, 29 Sep 2002 04:49:15 -0700; Not very. 15 - 50uH will work. The problem was not that the choke went bad. Something made it go go bad. Unless one discovers what this problem was, an instant replay seems possible. What is the act; /archives//html/Amps/2002-09/msg00270.html (8,295 bytes)
192. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 05:25:18 -0700; Another way to find a tube with a bent filament is with a high-potential tester. A grid-filament breakdown of under 5kV indicates a bent filament that may short when the filament is hot. C. 8kV is n; /archives//html/Amps/2002-08/msg00018.html (9,067 bytes)
193. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:13 -0700; I have observed that position makes virtually no difference in grid-filament withstanding potential. // I performed a hot filament sag test with a 3-500Z in horizontal position. The change in filamen; /archives//html/Amps/2002-08/msg00024.html (10,733 bytes)
194. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:16 -0700; Ian -- How much RF potential did you measure across the 0.01uF HV-bypass without a glitch resistor? Some radios R/T switch in 5mS. What is the measured make-speed of the stock relay with this circui; /archives//html/Amps/2002-08/msg00025.html (11,712 bytes)
195. [Amps] RE: FW: diode strings...bias (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:25 -0700; You forgot to figure in the 120v of RF. 1V + 4.5V = 5.5V. . . . 5.5V/120V = 4.6% regulation - however, it's RF-NFB, which reduces IMD. No one who replaced the 1A grid chokes with 30-ohm frangible re; /archives//html/Amps/2002-08/msg00026.html (8,696 bytes)
196. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 07:40:28 -0700; Bingo. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00027.html (8,874 bytes)
197. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 19:15:01 -0700; ** I tried operating one on its side. The sag rate @ 5V on the filament was slower than molassas in January. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00031.html (7,956 bytes)
198. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 19:58:55 -0700; If the bypass cap has a low XC at the frequency of operation, there should be a low V across the capacitor. The 1nF bypass cap has 88.4-ohms of reactance at 1.8MHz. There is roughly 1A of RF current; /archives//html/Amps/2002-08/msg00032.html (12,820 bytes)
199. Fw: Re: [Amps] meter internal R value, quick and easy. (score: 1): Author: 2@vc.net (2); Date: Fri, 2 Aug 2002 19:59:03 -0700; As have I. To measure full scale deflection, measure the V-drop across a 1.00k-ohm resistor in series with the meter. 1mV = 1uA. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/mea; /archives//html/Amps/2002-08/msg00033.html (7,604 bytes)
200. [Amps] al80a (score: 1): Author: 2@vc.net (2); Date: Sat, 3 Aug 2002 04:54:05 -0700; ** What was the measured resistance? // I have found that intermittent vhf parasites are so brief they can damage the element of a carbon-comp resistor without exhibiting damage to the moulded case.; /archives//html/Amps/2002-08/msg00039.html (8,958 bytes)

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