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1. [Amps] 4-400A ratings (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Sun, 08 May 2011 23:01:51 -0700; I've come into a pair of 4-400A's. I'm thinking about building an amplifier with one tube and using the other for a spare. Looking at the data sheet for class-C CW, the maximum rated plate current is; /archives//html/Amps/2011-05/msg00013.html (7,006 bytes)
2. Re: [Amps] 4-400A ratings (score: 1): Author: "Jim W7RY" <w7ry@inbox.com>; Date: Mon, 9 May 2011 07:26:47 -0700; Get out your calculator and figure out how much of a dB/S-meter increase 1100 watts is above 800 watts. Then YOU can make the decision. 73 Jim W7RY _______________________________________________ Amp; /archives//html/Amps/2011-05/msg00014.html (8,692 bytes)
3. Re: [Amps] 4-400A ratings (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 09 May 2011 08:33:36 -0700; I know. About 1.4 dB. Actually, I think 2 dB can make a difference on 160 meters. I don't know about 1.4! I'm thinking that the "SB220 cooling system" would not work with these tubes because the meta; /archives//html/Amps/2011-05/msg00015.html (9,201 bytes)
4. Re: [Amps] 4-400A ratings (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Mon, 09 May 2011 11:43:21 -0400; difference on 160 meters. It depends on what you do on 160 meters. If I could find a way to get another 1.4 dB on that band, I'd be doing it! But I consider myself an "extreme" weak signal DXer. Aft; /archives//html/Amps/2011-05/msg00016.html (7,516 bytes)
5. Re: [Amps] 4-400A ratings (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 09 May 2011 08:51:50 -0700; It's when your signal is on the edge of the other guy's noise that small increases matter. Several years ago, I went through the process of squeezing a few extra dB out of my antenna system, raising; /archives//html/Amps/2011-05/msg00017.html (8,215 bytes)
6. Re: [Amps] 4-400A ratings (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 9 May 2011 12:20:36 -0400; A small fan down below will take care of the filament pins and a SB-220 style fan on the glass. Be sure to ground the metal bas if going above 20M. Im another that counts loss in tenths of a dB when; /archives//html/Amps/2011-05/msg00018.html (10,586 bytes)
7. Re: [Amps] 4-400A ratings (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 9 May 2011 10:13:33 -0700 (PDT); Hi Vic, A 4-400A is just a 4-250A with a larger plate structure. It is an emission limit. 73 & Good morning, Marv WC6W http://qsl.net/wc6w/ ** -- On Sun, 5/8/11, Vic K2VCO <vic@rakefet.com> wrote: __; /archives//html/Amps/2011-05/msg00020.html (8,945 bytes)
8. Re: [Amps] 4-400A ratings (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Mon, 09 May 2011 14:35:23 -0400; There are rare times when even a db can make the difference. 73 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm; /archives//html/Amps/2011-05/msg00021.html (9,701 bytes)
9. Re: [Amps] 4-400A ratings (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 9 May 2011 17:07:35 -0400; With 3KV, plus enough drive and screen voltage you will have a hard time keeping them under 400 ma at full load. All they need is air to stay happy. Carl KM1H ________________________________________; /archives//html/Amps/2011-05/msg00022.html (9,670 bytes)

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