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301. [AMPS] Amp. Bypass SWR (score: 1): Author: measures@vcnet.com (measures); Date: Sun, 7 Nov 1999 16:05:29 -0700; If enough stuff is messed up, surely. Most turkeys overload the Cantenna - and overheat the resistor. This causes the resistance to increase. No. You need to cancel the series L in the relays with a; /archives//html/Amps/1999-11/msg00201.html (8,511 bytes)
302. [AMPS] WTB: Socket for 4CX5000 (score: 1): Author: measures@vcnet.com (measures); Date: Mon, 8 Nov 1999 07:16:52 -0700; I bought a special bypassed socket for a 4CX5000A from a surplus store. I found out that it was designed for AF modulator service. In order to use the socket for RF, all of the bypassing had to be r; /archives//html/Amps/1999-11/msg00210.html (7,717 bytes)
303. [AMPS] MLA-2500 mods (score: 1): Author: measures@vcnet.com (measures); Date: Mon, 8 Nov 1999 23:22:34 -0700; I don't know of anybody who has done it. It looks to me like it's doable by moving the tank coil. have fun. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/; /archives//html/Amps/1999-11/msg00221.html (7,579 bytes)
304. [AMPS] FROM: "Dieter Dippel" <dippel@rrze.uni-erlangen.de (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 01:48:23 -0700; Find a kaput bandswitch and use a good contact to repair your bandswitch. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@con; /archives//html/Amps/1999-11/msg00226.html (7,884 bytes)
305. [AMPS] SB 220 repair (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 06:23:06 -0700; There is no such capacitor in the ALC circuitry -- in the 110VDC supply, yes. Parasitics that are intermittent are not easy to investigate. Be sure to remove the wire between the bias contacts on th; /archives//html/Amps/1999-11/msg00228.html (8,620 bytes)
306. FW: [AMPS] FROM: "Dieter Dippel" <dippel@rrze.uni-erlangen.de (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 06:23:09 -0700; A factory Trio-Kenwood dealer. You can also replace contacts unless the ceramic is toasted. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Sub; /archives//html/Amps/1999-11/msg00229.html (8,868 bytes)
307. [AMPS] MLA-2500 mods (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 09:50:01 -0700; such The 8875 is rated at 300w diss. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests:; /archives//html/Amps/1999-11/msg00234.html (8,006 bytes)
308. [AMPS] Confused about 'circulating currents' (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 11:07:10 -0700; ? There is no exact means of tank calculating circulating current because the voltage at the Tune-C and Load-C is somewhat dependant on operator adjustment. A fair approximation is tank Q multiplied; /archives//html/Amps/1999-11/msg00238.html (7,897 bytes)
309. [AMPS] 811A Tube Quality (score: 1): Author: measures@vcnet.com (measures); Date: Tue, 9 Nov 1999 11:11:25 -0700; Rumour has it that Svetlana is dropping production of the 811A due to low sales, Charles. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submi; /archives//html/Amps/1999-11/msg00239.html (7,507 bytes)
310. [AMPS] Confused about 'circulating currents' (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 04:26:24 -0700; For a 2m amplifier using a pair of 4CX250Bs, 3/16 inch copper tubing would be much too small and lossey due to skin effect. I would use 2-inch Cu ribbon for such a tank. - Rich..., 805.386.3734, www; /archives//html/Amps/1999-11/msg00254.html (8,361 bytes)
311. [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 08:03:12 -0700; Install glitch diodes to protect meters. Remove +110vdc from relay's bias contacts to prevent shorted tube from destroying fil. transformer. . Install glitch R in hv positive lead. If your 0.82 ohm; /archives//html/Amps/1999-11/msg00258.html (8,466 bytes)
312. [AMPS] SB200: 208v versus 120v (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 10:13:37 -0700; If you have a stiff 120 outlet, the loss in power is slight. cheers, Jim - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@cont; /archives//html/Amps/1999-11/msg00261.html (7,352 bytes)
313. SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 12:21:31 -0700; The bandswitch used in my SB-220 has a measured breakdown potential of to deal with the roughly 10A of RF circulating current, Heath used double contacts plus forced air cooling on the switch. I use; /archives//html/Amps/1999-11/msg00263.html (8,724 bytes)
314. SV: SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 22:25:31 -0700; Why? You tune each for maz RF out. It hotswitches with anything but a tube type radio. Indeed. cheers, Pete - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/; /archives//html/Amps/1999-11/msg00272.html (8,704 bytes)
315. R: SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Wed, 10 Nov 1999 22:25:29 -0700; The Q on 10m is approx. 13 and the anode current is 0.8A. That's more than 5 to 6A of circulating currrent - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/a; /archives//html/Amps/1999-11/msg00273.html (8,613 bytes)
316. [AMPS] sb 220 update that was bounced the first time sent in... (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 11 Nov 1999 00:58:10 -0700; True enough, however, there are clues. yes. 10k ohm, 2w to the bias contacts ought to limit the short circuit current to a safe value. Harbach has them. A meter/shunt protection circuit is at Figure; /archives//html/Amps/1999-11/msg00278.html (9,639 bytes)
317. R: R: SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 11 Nov 1999 07:28:18 -0700; Probably less than 6A for SSB. However 6A @ 28MHz is similar in heating ability to 30ADC. cheers, Mauri - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/amps; /archives//html/Amps/1999-11/msg00284.html (7,592 bytes)
318. SV: SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 11 Nov 1999 07:28:16 -0700; ok. When I inadvertently grab the bandswitch I can feel the detent mechanism. - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps; /archives//html/Amps/1999-11/msg00285.html (8,556 bytes)
319. SV: SV: [AMPS] Re: SB220 problem (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 11 Nov 1999 08:37:05 -0700; I have never managed to switch contacts when I grabbed the wrong knob. Maybe it's time to oil the detent ball, Pete? - Rich..., 805.386.3734, www.vcnet.com/measures. -- FAQ on WWW: http://www.contes; /archives//html/Amps/1999-11/msg00288.html (8,410 bytes)
320. [AMPS] Hypersil transformers? (score: 1): Author: measures@vcnet.com (measures); Date: Thu, 11 Nov 1999 08:37:06 -0700; ? (Hipersil) Such a core is indicated by a continuous ribbon held together with a steel band - as opposed to a stacked core of E and I shaped plates. However, high performance core material is avail; /archives//html/Amps/1999-11/msg00289.html (7,025 bytes)

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