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1. [Amps] more sb220 questions (score: 1): Author: John <w4kv@arrl.net>; Date: Tue, 30 Aug 2005 14:56:34 -0400; I have this highly modified sb-220 that I bought several years ago. Please take a look and make any suggestions. http://www.geocities.com/w4kv/sb220 Thanks John w4kv _________________________________; /archives//html/Amps/2005-08/msg00761.html (6,187 bytes)
2. Re: [Amps] more sb220 questions (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Tue, 30 Aug 2005 19:51:59 -0400; John, Does the power out jump up after you raise the input power so far? Do you hear any high pitched squeal when this happens or just before it? I have seen the coax connectors go bad and cause this; /archives//html/Amps/2005-08/msg00763.html (8,386 bytes)
3. Re: [Amps] more sb220 questions (score: 1): Author: John Adkins <w4kv@yahoo.com>; Date: Tue, 30 Aug 2005 18:35:03 -0700 (PDT); Bob-- Thanks for the suggestion. I've already removed the wiring to/from the ext xformer, and I'll remove the connectors in the next couple of days. I'm going to leave the Amperite relay in place, si; /archives//html/Amps/2005-08/msg00765.html (8,676 bytes)
4. [Amps] more sb220 questions (score: 1): Author: John <w4kv@arrl.net>; Date: Wed, 31 Aug 2005 14:02:41 -0400; I never got any power out at all. No noise, either, except for the fan increasing rpm. I'm already moving toward restoration of the amp to a condition closer to the original kit. Any other suggestion; /archives//html/Amps/2005-08/msg00781.html (6,567 bytes)
5. Re: [Amps] more sb220 questions (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 02 Sep 2005 07:46:53 -0400; John, There's several thing that could cause no power output from the amp. That zener diode being one which I'd check first. It sets the tubes bias on transmit. No heater voltage. No high voltage wou; /archives//html/Amps/2005-09/msg00005.html (8,032 bytes)
6. [Amps] more sb220 questions (score: 1): Author: John Adkins <w4kv@yahoo.com>; Date: Fri, 2 Sep 2005 13:18:31 -0700 (PDT); Colin-- Thanks for the info re the chokes. I assume the caps should also be left out. My major direction at this point is to address the airflow problem that the modifier caused in shielding the tube; /archives//html/Amps/2005-09/msg00008.html (9,081 bytes)
7. [Amps] more sb220 questions (score: 1): Author: John Adkins <w4kv@yahoo.com>; Date: Fri, 7 Oct 2005 20:11:27 -0700 (PDT); The SB-220 project is moving along well. When I first fired it up, it seemed to fly, but then, without fanfare, plate and grid current fizzled, and power out dropped to 1.5 x excitor input. Check out; /archives//html/Amps/2005-10/msg00182.html (6,748 bytes)

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