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1. [Amps] sb-220 problem (score: 1): Author: mpmdb@pacbell.net (Mark Marriott); Date: Mon, 3 Jun 2002 15:49:50 -0700; Hi all, Got an sb-220 at an estate sale a year ago... just getting around to checking it out now. It exhibits the following problem: when in rcv mode (i.e. no exciter), the grid current pegs the mete; /archives//html/Amps/2002-06/msg00020.html (6,505 bytes)
2. [AMPS] SB-220 Problem (score: 1): Author: chilesp@intrepid.net (Pat Chiles); Date: Thu, 4 Jan 2001 20:06:14 -0500; This is a multi-part message in MIME format. --=_NextPart_000_008C_01C07689.CA72EB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My SB220 has started gi; /archives//html/Amps/2001-01/msg00153.html (8,955 bytes)
3. [AMPS] SB-220 Problem (score: 1): Author: ITR@Nanoteq.co.za (Ian Roberts); Date: Fri, 05 Jan 2001 12:03:34 +0200; Pat, according to my recent similar experiences, the band switch is now intermittent and making poor contact, probably due to old age, and is about to fail... The variable does tend to arc under thes; /archives//html/Amps/2001-01/msg00158.html (7,802 bytes)
4. [AMPS] SB-220 Problem (score: 1): Author: 2@vc.net (measures); Date: Fri, 5 Jan 2001 08:44:48 -0800; If the 80m Load padder contacts arced, chances are that there was an intermittent parasite c. 110Mz. 35 dollars is good deal for a very scarce item. To decrease bandswitch arcing, reduce the Rp of t; /archives//html/Amps/2001-01/msg00167.html (7,434 bytes)
5. [AMPS] SB-220 Problem (score: 1): Author: 2@vc.net (measures); Date: Fri, 5 Jan 2001 08:44:50 -0800; Increase the Rp of the suppressors by increasing L-supp. Adding a second suppressor is feasable with 3-500Zs. See Fig. 26 on my Web site. end - Rich..., 805.386.3734, www.vcnet.com/measures. end --; /archives//html/Amps/2001-01/msg00169.html (7,539 bytes)
6. [AMPS] SB-220 problem (score: 1): Author: rlake@monad.net (The Lakes); Date: Sun, 1 Feb 1998 11:36:49 -0500; I have an SB-220 that is acting strange.... over the past 6 months or so I have noticed when on 15m if I talk for more than abt 30 sec. or so the tubes start to crackle very badly. I noticed that on; /archives//html/Amps/1998-02/msg00000.html (7,397 bytes)
7. [AMPS] SB-220 problem (score: 1): Author: kbalmforth@compuall.com (K. Balmforth); Date: Thu, 04 Sep 1997 15:22:51 -0700; Hi all - I've got a modified SB-220 that is unable to operate on 15 or 10m without popping the (added) 10 ohm plate HV resistor. It puts out 600-700 W on 80 - 20 without a problem. I've replaced the; /archives//html/Amps/1997-09/msg00098.html (8,807 bytes)
8. [AMPS] SB-220 problem (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Fri, 5 Sep 1997 19:16:27 -0400; Go back to original and start over. I trust that the 10 Ohm resistor is a true wirewound and at least 15W rated. Directly grounding the grids in an otherwise unmodified 220 is asking for fireworks an; /archives//html/Amps/1997-09/msg00099.html (10,592 bytes)
9. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 00:44:51 +0000; Nonsense Carl. The last thing you want, if the tube faults, is to have the grid fly up to 3000 volts. If the grid, because of series resistance, reaches anode voltage levels during a fault... the ne; /archives//html/Amps/1997-09/msg00106.html (9,220 bytes)
10. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 00:44:52 +0000; Hi Ken, Where is the resistor located exactly? It should be between the supply line and the plate choke's cold end. Did the resistor pop before you did that? Maybe you aren't loading the amp heavy en; /archives//html/Amps/1997-09/msg00107.html (9,749 bytes)
11. [AMPS] SB-220 problem (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sat, 06 Sep 1997 08:35:14 EDT; On Sat, 6 Sep 1997 00:44:51 +0000 w8jitom@postoffice.worldnet.att.net writes: I guess we are both entitled to our opinions Tom. Anyway I never said to install a surge resistor in the grid, that would; /archives//html/Amps/1997-09/msg00110.html (11,250 bytes)
12. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 6 Sep 1997 10:37:12 +0000; Carl replied: You are entitled to your opinions, but experience has shown otherwise. Carl, think before you assume something needs to "arc". 1.) The cathode is emitting electrons, the grid is suddenl; /archives//html/Amps/1997-09/msg00116.html (11,581 bytes)
13. [AMPS] SB-220 problem (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 6 Sep 97 11:09:58 -0800; those However, Tom's opinion carries the weight of 'expert' status, Carl. good point. However, not being a self-recognized 'expert' gives you the luxury of being free to fess up to mistakes, Carl. O; /archives//html/Amps/1997-09/msg00119.html (11,968 bytes)
14. [AMPS] SB-220 problem (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 6 Sep 97 16:59:34 -0800; anode voltage The 'fly up to 3000 volts' scenario is quite unlikely to happen because one of the three 500v caps from the grid to ground is certain to short. It happened in my amplifier. It happens; /archives//html/Amps/1997-09/msg00128.html (7,450 bytes)
15. [AMPS] SB-220 problem (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sat, 06 Sep 1997 21:30:54 EDT; On Sat, 6 Sep 1997 10:37:12 +0000 w8jitom@postoffice.worldnet.att.net writes: Tom, you stick to your version and I will simply stick to my minuscule 35+ years experience in the trenches. Obviously we; /archives//html/Amps/1997-09/msg00129.html (14,283 bytes)
16. [AMPS] SB-220 problem (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 7 Sep 1997 11:30:09 +0000; To: <amps@contesting.com> Hi Carl, The SB-220 DESIGN specs are as I indicated. Look them up. I wasn't aware National Radio serviced SB-220's, and sold and serviced 3-500 amps. How many ground grid a; /archives//html/Amps/1997-09/msg00145.html (11,403 bytes)
17. [AMPS] SB-220 problem (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sun, 07 Sep 1997 14:11:07 EDT; On Sun, 7 Sep 1997 11:30:09 +0000 w8jitom@postoffice.worldnet.att.net writes: To: <amps@contesting.com> Do your "DESIGN" specs differ from the published specs in the manual? I'll stick with my earlie; /archives//html/Amps/1997-09/msg00152.html (13,218 bytes)
18. [Amps] SB-220 PROBLEM (score: 1): Author: Gudguyham@aol.com; Date: Tue, 16 Sep 2008 02:02:37 EDT; Just when you thought you have seen just about every problem with a particular amp, you see a new one that baffles. In this case the problem is this. Amp blows the .82 grid shunt resistor. Replace re; /archives//html/Amps/2008-09/msg00151.html (7,742 bytes)
19. Re: [Amps] SB-220 PROBLEM (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 16 Sep 2008 08:15:30 -0400; What happens to the bias voltage in the TX position with tubes out? Bad zener or insulator? Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://list; /archives//html/Amps/2008-09/msg00154.html (9,316 bytes)

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