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Total 12 documents matching your query.

1. [Amps] SB-200 input. (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Thu, 24 Jul 2014 10:11:25 -0700; Hi All I was reading an article in an older QST about doing a conversion on a SB-200. One of the things they did was take the tuned input out and put in a 4:1 toroid on the input, as the input impeda; /archives//html/Amps/2014-07/msg00105.html (6,657 bytes)
2. Re: [Amps] SB-200 input. (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Thu, 24 Jul 2014 17:17:12 -0700; I know the SB-200 has tuned inputs. Two of the coils in this one are bad. One of the caps is bad. Can you give me a source where I can buy new coils for the inputs? I need the ones for 15 and 10 mete; /archives//html/Amps/2014-07/msg00106.html (7,982 bytes)
3. Re: [Amps] SB-200 input. (score: 1): Author: donroden@hiwaay.net; Date: Thu, 24 Jul 2014 19:42:04 -0500; There must have been a reason that Heath went to so much trouble to include tuned inputs. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.; /archives//html/Amps/2014-07/msg00107.html (6,702 bytes)
4. Re: [Amps] SB-200 input. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 24 Jul 2014 21:20:43 -0400; The SB-200 was designed years before untuned SS rigs became common and the input networks were approximations for pi net tuned tube finals that didnt mind a 2:1 VSWR, especially on 20 and up. Tuned i; /archives//html/Amps/2014-07/msg00108.html (9,597 bytes)
5. Re: [Amps] SB-200 input. (score: 1): Author: Glen Zook via Amps <amps@contesting.com>; Date: Fri, 25 Jul 2014 08:35:03 -0700; If you cannot locate replacements, and if the coil form is intact, then you can rewind the coil using similar size wire. If the slug is frozen, then you can carefully break the slug into small pieces; /archives//html/Amps/2014-07/msg00109.html (8,755 bytes)
6. Re: [Amps] SB-200 input. (score: 1): Author: w5ov@w5ov.com; Date: Fri, 25 Jul 2014 11:05:54 -0500; What are the circumstances that caused the damage you're trying to resolve?. 73, Bob W5OV _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting; /archives//html/Amps/2014-07/msg00110.html (10,045 bytes)
7. Re: [Amps] SB-200 input. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 25 Jul 2014 12:53:53 -0400; I believe that the 80-20 and 15-10 ferrite cores are a different material. Someone with the time, parts, test equipment, and inclination can run some tests as Im not trusting my memory on this one (-; /archives//html/Amps/2014-07/msg00111.html (10,453 bytes)
8. Re: [Amps] SB-200 input. (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 25 Jul 2014 16:53:42 +0000; Hi all, adding to Carl's comment: Tuned inputs provide the flywheel effect that makes the tubes easier to drive and improves IMD 5-10dB. That's indeed to biggest reason to use a tuned input. The impe; /archives//html/Amps/2014-07/msg00112.html (13,328 bytes)
9. Re: [Amps] SB-200 input. (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Fri, 25 Jul 2014 21:57:24 -0500; It is always best to have the GG amplifiers tuned input circuit as close to the cathode as possible. There needs to be capacitance directly from the cathode to ground. A pi network input is ideal and; /archives//html/Amps/2014-07/msg00114.html (16,481 bytes)
10. Re: [Amps] SB-200 input. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 26 Jul 2014 10:28:38 -0400; While the below is an ideal situation it certainly isnt mandatory in many cases. Take the older amps with just a .01 coupling cap for the input that are regularly in use with a SS exciter. The variou; /archives//html/Amps/2014-07/msg00116.html (18,128 bytes)
11. Re: [Amps] SB-200 input. (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sat, 26 Jul 2014 07:52:17 -0700; One way to add a tuned input with little fuss is to place a "tee" connector at the input of the SS amp and connect a parallel resonant LC circuit at the tee. Make the LC circuit have a Q of between 3; /archives//html/Amps/2014-07/msg00117.html (8,724 bytes)
12. Re: [Amps] SB-200 input. (score: 1): Author: Jim Hargrave <w5ifp@gvtc.com>; Date: Sat, 26 Jul 2014 11:24:33 -0500; The Dentron CM1,2 & U series of external input tuners are fixed broad band filters, It uses a parallel circuit on 160m and PI-L on 80/40/20 with PI on 15/10. The manual only specifies a "length" of R; /archives//html/Amps/2014-07/msg00118.html (9,850 bytes)

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