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1. [Amps] SB-220 and Graphite tubes in high duty cycles (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 4 Jul 2009 22:26:39 -0400; Id be concerned about the plate transformer temperature rise as its only rated at .6 kva in CCS service. Also filter cap temperatures. In the RF deck the problem could be RF heating in the input or o; /archives//html/Amps/2009-07/msg00100.html (19,447 bytes)
2. Re: [Amps] SB-220 and Graphite tubes in high duty cycles (score: 1): Author: "Jeff Blaine AC0C" <keepwalking188@yahoo.com>; Date: Sun, 5 Jul 2009 11:31:03 +0800; Carl, That SB220 stock transformer is really a marginal design. The SB200 is a far sturdy bird albeit at a lower voltage - even when compared under the same current draw. And wow, when the winding sh; /archives//html/Amps/2009-07/msg00104.html (22,062 bytes)
3. Re: [Amps] SB-220 and Graphite tubes in high duty cycles (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 5 Jul 2009 10:03:53 -0400; Never had one blow here Jeff, I get them after the smoke is gone! Sometimes the damage is extensive. Both transformers, filter caps, diodes, meter, and a tube or two. Customers dont like hearing that; /archives//html/Amps/2009-07/msg00110.html (23,974 bytes)

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