- 1. [Amps] SB 220 with 3 400 tubes (score: 1)
- Author: "WLI" <lgp@wlionline.com>
- Date: Sun, 26 Apr 2009 15:39:58 -0500
- I am looking a purchasing an SB220. I have two to choose from. One has a pair of 3 400 tubes and the other has 3-500's. The one with 3 400's looks cleaner but I am not sure if the tubes are equal. Ca
- /archives//html/Amps/2009-04/msg00379.html (7,017 bytes)
- 2. Re: [Amps] SB 220 with 3 400 tubes (score: 1)
- Author: "Steve Katz" <stevek@jmr.com>
- Date: Mon, 27 Apr 2009 10:07:58 -0700
- I don't recall SB-220s being sold new with 3-400Zs; I thought they were all shipped with 3-500Zs. The 3-400Z was really "zero bias," so using a bit of bias as normally used with 3-500Zs, at similar E
- /archives//html/Amps/2009-04/msg00382.html (7,990 bytes)
- 3. Re: [Amps] SB 220 with 3 400 tubes (score: 1)
- Author: "Carl" <km1h@jeremy.mv.com>
- Date: Mon, 27 Apr 2009 14:43:44 -0400
- The operational differences are minimal for CW/SSB and that swap was done several times. You lose 200W Pd which may be critical for RTTY, digital, and AM. Carl KM1H __________________________________
- /archives//html/Amps/2009-04/msg00385.html (7,882 bytes)
- 4. Re: [Amps] SB 220 with 3 400 tubes (score: 1)
- Author: "Fern" <crc@cyberlink.bc.ca>
- Date: Mon, 27 Apr 2009 12:44:48 -0600
- I also have a nice SB-220 amplifier that I recently purchased as I owned it when it was new. Back then, I'd had a problem with one of the original eimac 3-500Z tubes going south. At the time, I also
- /archives//html/Amps/2009-04/msg00387.html (9,315 bytes)
- 5. Re: [Amps] SB 220 with 3 400 tubes (score: 1)
- Author: Colin Lamb <k7fm@teleport.com>
- Date: Mon, 27 Apr 2009 12:53:51 -0700 (GMT-07:00)
- It has been noted that the 3-400 has a lower plate dissipation than the 3-500. However, it is not quite that simple. The dissipation is controlled by the air blowing by, and both the power supply and
- /archives//html/Amps/2009-04/msg00388.html (7,949 bytes)
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