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Total 26 documents matching your query.

1. [Amps] SB220 "A" mods (score: 1): Author: "John Lyles" <jtml@losalamos.com>; Date: Fri, 28 Mar 2008 04:19:44 -0700; You won't get any concensus here on a single path to upgrade this venerable and easy-to-mod power amplifier. However, IMHO: Highly recommended: 1) drill the small holes to be able to lube the fan eve; /archives//html/Amps/2008-03/msg00304.html (8,540 bytes)
2. Re: [Amps] SB220 "A" mods (score: 1): Author: Lee Buller <k0wa@swbell.net>; Date: Fri, 28 Mar 2008 06:10:58 -0700 (PDT); And...... You might look at the following after understanding the amp fully....... Removing the grounded grid circuitry and just grounding the grids. After all, it is a grounded grid amp. Re-engineer; /archives//html/Amps/2008-03/msg00306.html (7,821 bytes)
3. Re: [Amps] SB220 "A" mods (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 28 Mar 2008 10:33:32 -0400; There are 2 schools of thought on that. I prefer to leave them original. The trade off is about 50W. Ive converted several hundred to 6M over the past almost 40 years and they are 100% stable just as; /archives//html/Amps/2008-03/msg00307.html (8,039 bytes)
4. Re: [Amps] SB220 "A" mods (score: 1): Author: chasm@texas.net; Date: Fri, 28 Mar 2008 09:51:03 -0500; my PC and speakers, etc are about 3 feet away on a separate circuit from the SB220 and I often have to unplug the speakers because I can hear myself thru them in spite of my Heil headset. I have cons; /archives//html/Amps/2008-03/msg00308.html (7,450 bytes)
5. Re: [Amps] SB220 "A" mods (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 28 Mar 2008 11:00:11 -0400; I had that problem years ago with any amp. The cure was to wind the speaker leads in a fat 75 mix toroid such as the FT240-75 from Amidon and others. I also did it upstairs to the remote TV and stere; /archives//html/Amps/2008-03/msg00309.html (9,570 bytes)
6. Re: [Amps] SB220 "A" mods (score: 1): Author: bob finger <finger@goeaston.net>; Date: Fri, 28 Mar 2008 10:59:58 -0400; Its probably not the SB220 causing the problem. Its the pc speakers rectifying. Happens at my operating desk with any of several amplifiers. I also have to turn the 2 meter FM radio off as the antenn; /archives//html/Amps/2008-03/msg00310.html (8,344 bytes)
7. Re: [Amps] SB220 "A" mods (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Fri, 28 Mar 2008 11:05:22 -0400; In joking about the distant past I ask my ex-G.I. buddies if they remember that trashcan by the door of the recruit barracks, and what went inside it. That gets a laugh, guaranteed! Some of us even g; /archives//html/Amps/2008-03/msg00311.html (8,354 bytes)
8. Re: [Amps] SB220 "A" mods (score: 1): Author: Commander John <crazytvjohn@yahoo.com>; Date: Fri, 28 Mar 2008 09:19:08 -0700 (PDT); W9ZY .... Commander John .... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2008-03/msg00314.html (8,472 bytes)
9. Re: [Amps] SB220 "A" mods (score: 1): Author: "Steve Flood" <kk7uv@bresnan.net>; Date: Fri, 28 Mar 2008 10:35:45 -0600; I've often wondered about the "MODE" switch? It selects the appropriate winding tap on the primary for higher voltage SSB or lower voltage CW. As you switch from one mode to the other, there is a tem; /archives//html/Amps/2008-03/msg00315.html (8,145 bytes)
10. Re: [Amps] SB220 "A" mods (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Fri, 28 Mar 2008 14:08:32 -0400; Ive never replaced one or heard of a problem. The PS caps are already charged and wont discharge much in the time the switch is thrown. Carl KM1H _______________________________________________ Amps; /archives//html/Amps/2008-03/msg00321.html (8,951 bytes)
11. Re: [Amps] SB220 "A" mods (score: 1): Author: "Rob Atkinson" <ranchorobbo@gmail.com>; Date: Fri, 28 Mar 2008 14:13:56 -0500; Don't forget to use the AMPS Archive as a resource also. A search of "SB220" or "SB220 Mods" will bring enough reading to paralize you for an afternoon hi hi. http://lists.contesting.com/archives//cg; /archives//html/Amps/2008-03/msg00323.html (8,334 bytes)
12. Re: [Amps] SB220 "A" mods (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Sat, 29 Mar 2008 07:38:31 +0100; Sorry but no. A speaker can not "rectify" RF. Lets not start another wives tale. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mail; /archives//html/Amps/2008-03/msg00330.html (8,402 bytes)
13. Re: [Amps] SB220 "A" mods (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sat, 29 Mar 2008 08:04:25 -0700; Not the speakers...the transistors in the audio amplifier driving them! The RF is picked up on the speaker wires. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ________________________________; /archives//html/Amps/2008-03/msg00334.html (9,086 bytes)
14. Re: [Amps] SB220 "A" mods (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Sat, 29 Mar 2008 11:28:55 -0400; Using open wire, 600 ohm feeders and running QROO with ten feet of feedline in the shack gave me fits on several bands, with various speakers grumbling about as audio was transmitted. Aside from usin; /archives//html/Amps/2008-03/msg00335.html (9,897 bytes)
15. Re: [Amps] SB220 "A" mods (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sat, 29 Mar 2008 11:36:44 -0400; Jim SM2EKM said: "A speaker can not "rectify" RF. Lets not start another wives tale" Wives in the USA would never talk about rectifying RF. It must be a Swedish thing. 73, Ken W2DTC _________________; /archives//html/Amps/2008-03/msg00336.html (9,246 bytes)
16. Re: [Amps] SB220 "A" mods (score: 1): Author: "W7RY" <w7ry@arrl.net>; Date: Sat, 29 Mar 2008 08:43:47 -0700; Sure it can! A computer speaker system can surly rectify RF. The speaker system contains and amplifier using an IC or several transistors, voltage regulators and diodes. It also has wiring and an ass; /archives//html/Amps/2008-03/msg00337.html (10,025 bytes)
17. Re: [Amps] SB220 "A" mods (score: 1): Author: Clifford Crane <w4nj@tampabay.rr.com>; Date: Sat, 29 Mar 2008 11:53:09 -0400; I use Studio Quality Active Monitors from Genelec... RF proof, Aluminum Enclosure, self contained with amplifiers. NOTHING gets into them! Vy 73, Cliff - W4NJ - From near The House of The Mouse - Dis; /archives//html/Amps/2008-03/msg00338.html (13,565 bytes)
18. Re: [Amps] SB220 "A" mods (score: 1): Author: Jan Erik Holm <sm2ekm@telia.com>; Date: Sat, 29 Mar 2008 18:33:34 +0100; No it can NOT. I persist! I don´t think I have to explain what a speaker is, it has been clear to me for 50 years. _______________________________________________ Amps mailing list Amps@contesting.co; /archives//html/Amps/2008-03/msg00341.html (10,817 bytes)
19. Re: [Amps] SB220 "A" mods (score: 1): Author: Pat Barthelow <aa6eg@hotmail.com>; Date: Sat, 29 Mar 2008 10:51:15 -0700; Jan and Group, I think you are all in agreement actually... Jim's operative word there, is "System" Speakers when used, are assumed to be connected to active electronics, which invariably include dio; /archives//html/Amps/2008-03/msg00343.html (11,815 bytes)
20. Re: [Amps] SB220 "A" mods (score: 1): Author: "Rob Atkinson" <ranchorobbo@gmail.com>; Date: Mon, 31 Mar 2008 12:47:11 -0500; I'm happy for you that you can afford at least $500 for a pair of computer PC speakers but I think I'll handle the RF noise by turning my $10 hamfest speakers off when I'm on the air and save around; /archives//html/Amps/2008-03/msg00388.html (8,463 bytes)

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