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1. [AMPS] SB-220 Smoke Test (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 17:46:34 -0400; First. . .good news Jose. Just keep up the high voltage respect . . . Second. . . SB-220 with directly grounded grid (three rg58 braids on each tube). Smoke test was a complete success. The amp tuned; /archives//html/Amps/2000-09/msg01069.html (7,427 bytes)
2. [AMPS] SB-220 Smoke Test (score: 1): Author: tduffy@sygnet.com (Tim Duffy); Date: Tue, 26 Sep 2000 17:19:44 -0500; So what benefit did directly grounding the grids bring? More output on any or all bands for the same drive power? The same output on any or all bands for LESS drive power? A better VSWR between the r; /archives//html/Amps/2000-09/msg01070.html (8,351 bytes)
3. [AMPS] SB-220 Smoke Test (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 26 Sep 2000 18:54:37 -0400; Hi Tim, I normally do that mod to SB-220's and other amps. If you put a lug by each grid pin, you can actually remove turns from the suppressor without running into instability compared to a similar; /archives//html/Amps/2000-09/msg01072.html (8,319 bytes)
4. [AMPS] SB-220 Smoke Test (score: 1): Author: apight@pa.net (A P); Date: Tue, 26 Sep 2000 19:15:39 -0400; Tim, Good point. I measured slightly more output on 10 and 15M - previously around 900W out on 10 and now about 950W. It seems to tune more smoothly but this is pretty subjective. Input SWR was sligh; /archives//html/Amps/2000-09/msg01073.html (10,151 bytes)
5. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Tue, 26 Sep 2000 16:23:49 -0700; ? When I spoke with Tom on the telephone, he told me that he had repaired about 400 SB-220s and that he had seen lots of parasitic damage. In a stock SB-220, there is typically a slight double-dip o; /archives//html/Amps/2000-09/msg01074.html (9,481 bytes)
6. [AMPS] SB-220 Smoke Test (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 26 Sep 2000 19:46:47 -0400; What I actually said was I saw some damage under some load conditions that appeared to be VLF parasitics. I have duplicated that when the chokes were in place across the grid caps by placing the cor; /archives//html/Amps/2000-09/msg01075.html (8,037 bytes)
7. [AMPS] SB-220 Smoke Test (score: 1): Author: wy6k@yahoo.com (michael watts); Date: Tue, 26 Sep 2000 19:06:43 -0700 (PDT); Did you actually mean to say VLF parasitics? __________________________________________________ Do You Yahoo!? Send instant messages & get email alerts with Yahoo! Messenger. http://im.yahoo.com/ --; /archives//html/Amps/2000-09/msg01077.html (8,995 bytes)
8. [AMPS] SB-220 Smoke Test (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Wed, 27 Sep 2000 09:18:00 +0200; The grid is already (dynamically) grounded by capacitors, expecially on higher frequencies. A mechanichal grounding is practically ininfluent and produces only marginal changes/improvements. In SB220; /archives//html/Amps/2000-09/msg01080.html (9,312 bytes)
9. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 05:47:48 -0700; ? Just how this is possible is somewhat less than obvious. Welcome to the Rauchian world, Mike - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps; /archives//html/Amps/2000-09/msg01088.html (9,868 bytes)
10. [AMPS] SB-220 Smoke Test (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 27 Sep 2000 15:48:11 +0100; VLF resonances are *the* main cause of parasitic oscillation in VHF/UHF power amps. They generally arise because half-wave tuned lines become open-circuits at low frequencies, so that both the input; /archives//html/Amps/2000-09/msg01106.html (9,204 bytes)
11. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 10:35:43 -0700; [chortle] In the Rauchian world of alleged VLF oscillations, one ignores the reactance of C-anode/cathode at VLF. end - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.c; /archives//html/Amps/2000-09/msg01110.html (9,588 bytes)
12. [AMPS] SB-220 Smoke Test (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Wed, 27 Sep 2000 16:15:20 -0400; If my calculation is correct, it would be about 205 Khz, assuming the choke is 1 mh. Mark WB8JKR ________________________________________________________________ YOU'RE PAYING TOO MUCH FOR THE INTERN; /archives//html/Amps/2000-09/msg01117.html (9,778 bytes)
13. [AMPS] SB-220 Smoke Test (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Wed, 27 Sep 2000 22:51:33 +0200; The resonance of SB220/TL922 grid-ground circuit is given by the parallel of few mH and few hundred pF, actually that circuit is never really "open" at any frequency because of the low Q caused by th; /archives//html/Amps/2000-09/msg01119.html (10,643 bytes)
14. [AMPS] SB-220 Smoke Test (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Wed, 27 Sep 2000 23:54:00 +0200; It's more, I think 3 mH. 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@c; /archives//html/Amps/2000-09/msg01123.html (9,020 bytes)
15. [AMPS] SB-220 Smoke Test (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 27 Sep 2000 19:35:28 -0400; The chokes were various types through the life of the amplifier, but none I'm aware of were ever Litz wire. Even if they were, the grid impedance would still have been very high. 1.) The Pi network; /archives//html/Amps/2000-09/msg01125.html (9,970 bytes)
16. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 17:42:55 -0700; Agreed / What is the reactance of the 3-500Z's 0.07pF anode/cathode feedback capacitance at 205KHz, Mark? At 205KHz, what is the Z of the 50uH HV-RFC and 2000pf HV bypass.? end - Rich..., 805.386.37; /archives//html/Amps/2000-09/msg01126.html (10,537 bytes)
17. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 17:42:57 -0700; defending the ''expert'' cheers, Mauri - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests; /archives//html/Amps/2000-09/msg01127.html (11,767 bytes)
18. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 18:14:43 -0700; Not a good bet. . - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contes; /archives//html/Amps/2000-09/msg01128.html (8,599 bytes)
19. [AMPS] SB-220 Smoke Test (score: 1): Author: 2@vc.net (measures); Date: Wed, 27 Sep 2000 18:14:44 -0700; Mr. Rauch conveniently ignores the 50uH hv-rfc and 2000pF B+ bypass cap. [chortle] - Rich..., 805.386.3734, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions:; /archives//html/Amps/2000-09/msg01129.html (9,847 bytes)
20. [AMPS] SB-220 Smoke Test (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Thu, 28 Sep 2000 00:13:47 -0400; .07 pf at 205 Khz. = 11 meg 50 uh at 205 Khz. = 64 ohms .002 ufd 205 Khz. = 388 ohms What is this, a math test? I was just curious of the frequency. Mark WB8JKR ______________________________________; /archives//html/Amps/2000-09/msg01131.html (9,246 bytes)

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