3CX800A7 vs 4CX800A - HomeBrew Forum at eHam.net

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eHam.net Forum : HomeBrew : 3CX800A7 vs 4CX800A

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3CX800A7 vs 4CX800A	Reply
by PRUNE on August 9, 2004	Mail this to a friend!
I read somewhere that the cheaper Svetlana 4CX800A can be used as a substitute for the Eimac 3CX800A7. Does anyone know if the Svetlana tube also uses beam forming? Would I notice a difference at audio frequencies? (I'm serious) Also, can this tube be used in class A? On Eimac's site, it says it's designed for class B, but does that mean that it merely won't be as efficient in class A, or it will blow up, or what?

RE: 3CX800A7 vs 4CX800A	Reply
by KA4FWK on August 23, 2004	Mail this to a friend!
do you have a schematic on the 4cx800, if you do could i get a copy of it? kenneth gibson KA4Fwk e-mail,,kennyg048@aol.com

RE: 3CX800A7 vs 4CX800A	Reply
by W9GB on September 11, 2004	Mail this to a friend!
The 3CX800A7 is a TRIODE and the 4CX800A is a TETRODE. The design, usage and handling of each tube in a RF amplifier is quite different. Economics (of the tube) should be ONE criteria in the selection of a tube for an amplifier. When it is the ONLY criteria - you get designs such as the "sweep tube" amplifiers from the 1960s and 1970s -- that now have limited tube production in Eastern Europe/Russia and original US tubes more expensive than quality RF tubes. Are you aware of the Ian White, G3SEK control boards? http://www.ifwtech.co.uk/g3sek/boards/ What makes a good tube amplifier? http://www.qsl.net/kk5dr/goodamps.htm WD7S Triode Control Board http://wd7s.home.att.net/triode_control.htm w9gb

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