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1. [AMPS] SB220 & 4-400s (score: 1): Author: bravo@iol.ie (John Tait); Date: Wed, 4 Apr 2001 16:45:40 +0100; All Hail...!! Oh Enlightened ones...!! A friend of mine has an old SB220... The 3-500s have departed for Valhalla, but we have a number of 4-400As...(allegedly) good pulls. If we use the 4-400s inste; /archives//html/Amps/2001-04/msg00066.html (7,762 bytes)
2. [AMPS] SB220 & 4-400s (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Wed, 4 Apr 2001 11:22:48 -0700; Hi John, This is from long ago memory... First, I recall you have to wire the grid pins together (2,3 & 4) on the bottom of the sockets as only one of them has a DC return in a stock SB-220. And then; /archives//html/Amps/2001-04/msg00072.html (9,043 bytes)
3. [AMPS] SB220 & 4-400s (score: 1): Author: ku7i@hotmail.com (Lane Zeitler); Date: Wed, 04 Apr 2001 13:19:24 -0700; If the sockets are recessed like in the Henry 2KD-5 and the like then the tubes will not stay seated, not enough pin to grab the tube. You may have to mount the sockets on top of the chassis or make; /archives//html/Amps/2001-04/msg00075.html (9,902 bytes)
4. [AMPS] SB220 & 4-400s (score: 1): Author: vk6apk@eon.net.au (Alek Petkovic); Date: Thu, 05 Apr 2001 05:34:56 +0800; Spot on Marv, That is exactly how it is with the 4-400's. My best mate VK6JX got around 900W to 1KW out of his. He now has the 3-500's in but still has the tetrodes as spares. 73 de Alek VK6APK -- FA; /archives//html/Amps/2001-04/msg00078.html (10,199 bytes)
5. [AMPS] SB220 & 4-400s (score: 1): Author: 2@vc.net (measures); Date: Wed, 4 Apr 2001 22:00:37 -0700; In my SB-220, the ZSAC with 4-400s was a bit low with the stock 2900v. 3500v would have been better. Adding a c. 200v transformer to the hv transformer sec. should have fixed the problem. There is p; /archives//html/Amps/2001-04/msg00090.html (7,096 bytes)
6. [AMPS] SB220 & 4-400s (score: 1): Author: bravo@iol.ie (John Tait); Date: Thu, 5 Apr 2001 15:16:33 +0100; You guys are amazing....!! Thanks to everyone who replied to my question... Total agreement amongst you all as regards the main points, and some nice little "add ons" as well.. If you see a glow in t; /archives//html/Amps/2001-04/msg00107.html (7,755 bytes)

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