- 1. [Amps] SB-220 diode failure (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Tue, 9 Aug 2005 10:05:52 -0700 (PDT)
- My sb220 cooked one of the diodes on the pc board a couple of days ago. I replaced the faulty one with a 1kv piv 2.5 amp substitute that was in my junk box. Resoldered the wires back to the pc board,
- /archives//html/Amps/2005-08/msg00342.html (7,732 bytes)
- 2. [Amps] SB-220 diode failure (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Mon, 29 Aug 2005 09:43:30 -0700 (PDT)
- Thanks for the suggestions earlier this month regarding the SB-220. You may recall that after replacing a failed diode on the PC board, resting plate current was 0.3 amp instead of 0.120. The zener d
- /archives//html/Amps/2005-08/msg00752.html (7,758 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. Re: [Amps] Amps Digest, Vol 33, Issue 2 (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Fri, 2 Sep 2005 12:02:30 -0700 (PDT)
- Will-- Thanks for the suggestions. I've already started taking the amp back to a less-altered state. I've removed the shield from around the tube sockets and am going to put the bifilar choke back to
- /archives//html/Amps/2005-09/msg00007.html (8,887 bytes)
- 5. [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)
- 6. [Amps] Alpha releases New Amp 9500 (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Fri, 16 Sep 2005 17:57:28 -0700 (PDT)
- A number of us are still using Commodore and Atari computers. Should Alpha--the avant-garde amplifier company (their suggestion)--expand the new computer to accommodate them, too? What they're doing
- /archives//html/Amps/2005-09/msg00161.html (7,628 bytes)
- 7. Re: [Amps] Alpha releases New Amp 9500 (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Sat, 17 Sep 2005 06:11:06 -0700 (PDT)
- Actually, the point that I'm trying to make is that new technology should be new technology. I don't object to the amplifier having a serial port. I'm disappointed that it doesn't have a USB port. Or
- /archives//html/Amps/2005-09/msg00170.html (9,069 bytes)
- 8. [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)
- 9. [Amps] sb220 relay (score: 1)
- Author: John Adkins <w4kv@yahoo.com>
- Date: Mon, 10 Oct 2005 12:55:40 -0700 (PDT)
- I've decided to replace the relay in the sb220 I've referred to in this list. Jeff at Harbach is away on business indefinitely, and I'm wondering if anybody knows a source for a substitute. I've gone
- /archives//html/Amps/2005-10/msg00253.html (6,523 bytes)
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