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Total 13 documents matching your query.

1. [AMPS] SB 220 vice SB221 (score: 1): Author: schaier@avotec.com (Len Schaier); Date: Sat, 22 Nov 1997 10:33:39 -0500; Hello, I've been looking for an SB220 amplifier and may have found a good one. Yesterday a local Ham who saw an old packet listing called and said he had an SB221 that included the 10 meter mod. Besi; /archives//html/Amps/1997-11/msg00316.html (8,044 bytes)
2. [AMPS] SB 220 vice SB221 (score: 1): Author: perring@infocom.net (Bob Perring); Date: Sat, 22 Nov 1997 10:05:36 -0600; the it ==> Len. I'm sure you will get replies from others on this question, but here is what I think I know about the SB-220 vs. SB-221. Except for 10 meters being an after-add to the bandswitch wiri; /archives//html/Amps/1997-11/msg00317.html (10,926 bytes)
3. [AMPS] SB 220 vice SB221 (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sat, 22 Nov 1997 13:03:09 EST; On Sat, 22 Nov 1997 10:33:39 -0500 Len Schaier <schaier@avotec.com> writes: Hi Len, The SB-221 came along after the FCC got their nose out of joint about CBers. Except for the missing 10M position on; /archives//html/Amps/1997-11/msg00319.html (8,918 bytes)
4. [AMPS] SB 220 vice SB221 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 22 Nov 97 15:28:53 -0800; - There is a CB filter in the SB-221, and some of the tuned input circuits are different than the SB-220, due to the reactance of the CB filter. The trade-off of wider spacing is that when the inter; /archives//html/Amps/1997-11/msg00321.html (11,839 bytes)
5. [AMPS] SB 220 vice SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sun, 23 Nov 1997 08:10:16 +0000; Hi Bob and all, That's utter nonsense. The spitting and sputtering is not due to parasitics at all. The plate variable/ tank arcing problem most often is incorrect tuning, and secondarily incorrect r; /archives//html/Amps/1997-11/msg00323.html (10,230 bytes)
6. [AMPS] SB 220 vice SB221 (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 23 Nov 97 10:03:45 -0800; Does Mr. Rauch's 'nonsense' claim check out? It is true that hotswitching provides current-transients which tend to ring the anode's VHF-resonant circuit -- which sometimes results in VHF parasites; /archives//html/Amps/1997-11/msg00327.html (11,697 bytes)
7. [AMPS] SB 220 vice SB221 (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Sun, 23 Nov 1997 20:31:31 +0000; That's strange; every time I've had an amp do the "arcing" and "spitting" thing, it was when either/or both the plate and loading caps were at or near minimum; and almost always when the bandswitch w; /archives//html/Amps/1997-11/msg00328.html (14,124 bytes)
8. [AMPS] SB 220 vice SB221 (score: 1): Author: km1h@juno.com (km1h @ juno.com); Date: Sun, 23 Nov 1997 19:44:40 EST; No need to repeat the long stuff from Steve but I feel that he made a few points that I think are wrong. 1. Once a sustained arc occurs in the Tune cap or across the bandswitch it becomes a very wide; /archives//html/Amps/1997-11/msg00333.html (9,819 bytes)
9. [AMPS] SB 220 vice SB221 (score: 1): Author: ko0u@os.com (Steve Harrison); Date: Mon, 24 Nov 1997 01:53:16 +0000; Carl, I believe that you are talking about a totally different failure mechanism, that caused by an incorrect load, and which is something that occurs over some finite, measurable period of time, som; /archives//html/Amps/1997-11/msg00334.html (14,819 bytes)
10. [AMPS] SB 220 vice SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 24 Nov 1997 07:39:42 +0000; If you read what I wrote carefully, you'll see I specified the tank IS resonant, the load is simply removed. How this happens is simple. A tube appears like a diode in series with a time varying res; /archives//html/Amps/1997-11/msg00336.html (12,364 bytes)
11. [AMPS] SB 220 vice SB221 (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 24 Nov 1997 09:10:32 +0000; Hi Steve, You have no idea what the exciter power or other transient conditions were at the time. You could have a relay out of sync, an exciter transient, an antenna fault, or even incorrect loadin; /archives//html/Amps/1997-11/msg00338.html (16,359 bytes)
12. [AMPS] SB 220 vice SB221 (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 24 Nov 97 08:28:27 -0800; Yes, but the SB-220 tune C typically arcs when the load is connected, well after the amplifier has been tuned up. I have inadvertently tuned my SB-220 up with the load removed. There was no arcing i; /archives//html/Amps/1997-11/msg00340.html (8,891 bytes)
13. [AMPS] SB 220 vice SB221 (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 24 Nov 97 11:35:39 -0800; He stated that the loading was correct, Mr. Rauch. There was apparently no antenna fault. ... Have we heard about amplifiers that had parasitic problems at the instant they switched from receive to; /archives//html/Amps/1997-11/msg00342.html (13,437 bytes)

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