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1. [Amps] Amp output power (score: 1): Author: Chris Fox <ni4ldipole@gmail.com>; Date: Sat, 22 Aug 2015 11:46:29 -0400; Trying to get a fairly accurate estimate on what the output would be from a amp with... 3600 plate volts 3 - 3cxp800 100 watts drive can anyone help with the formula. ________________________________; /archives//html/Amps/2015-08/msg00071.html (6,342 bytes)
2. Re: [Amps] Amp output power (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sun, 23 Aug 2015 12:35:55 +0800; I would put my guess in at a minimum of 5kW. Alek. VK6APK On 22/08/2015 11:46 PM, Chris Fox wrote: Trying to get a fairly accurate estimate on what the output would be from a amp with... 3600 plate v; /archives//html/Amps/2015-08/msg00072.html (7,386 bytes)
3. Re: [Amps] Amp output power (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Sun, 23 Aug 2015 00:10:46 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: Operating class AB, you can figure between 60-65 percent efficiency when tuned for 1500 watts output. Even in grounded grid, 100 watts drive will be too; /archives//html/Amps/2015-08/msg00073.html (7,457 bytes)
4. Re: [Amps] Amp output power (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sun, 23 Aug 2015 18:13:47 +0800; Trying to get a fairly accurate estimate on what the output would be from a amp with... 3600 plate volts 3 - 3cxp800 100 watts drive can anyone help with the formula. REPLY: Operating class AB, you; /archives//html/Amps/2015-08/msg00074.html (8,845 bytes)
5. Re: [Amps] Amp output power (score: 1): Author: Kevin Stover <kevin.stover@mediacombb.net>; Date: Sun, 23 Aug 2015 09:13:09 -0500; Going through the CPII datasheet for the 3CPX800 we see max plate voltage of 4500V so the tubes will handle the voltage. The tube still has the dainty 4W max dissipation grid so if you hit it with 36; /archives//html/Amps/2015-08/msg00075.html (8,011 bytes)
6. Re: [Amps] Amp output power (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 23 Aug 2015 15:56:24 -0400; With 2400 watts dissipation, (3 tubes) at 62% I get almost 3,900 watts out continuous. The newer data sheet lists a max of 3,500 volts with a typical operating voltage of 3200 volts. 23 watts drive g; /archives//html/Amps/2015-08/msg00078.html (9,779 bytes)
7. [Amps] Amp output power (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 23 Aug 2015 18:25:38 -0700; Going through the CPII datasheet for the 3CPX800 we see max plate voltage of 4500V so the tubes will handle the voltage. The tube still has the dainty 4W max dissipation grid so if you hit it with 36; /archives//html/Amps/2015-08/msg00079.html (7,715 bytes)
8. Re: [Amps] Amp output power (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Mon, 24 Aug 2015 03:21:29 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: That's interesting. At 2250 VDC and .6 amps, the DC input is only 1350 watts. At 60% efficiency, the RF output would be 810 watts and the plate dissipati; /archives//html/Amps/2015-08/msg00080.html (8,277 bytes)
9. Re: [Amps] Amp output power (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 24 Aug 2015 08:49:30 -0700; That's close to how they run in Ten Tec Titan 425 amps -- using an N8LP LP100A to set output power to 1.5kW, I end up with about 50W drive on most bands. As has been noted, these tubes don't like too; /archives//html/Amps/2015-08/msg00081.html (8,557 bytes)
10. Re: [Amps] Amp output power (score: 1): Author: Scott McDonald via Amps <amps@contesting.com>; Date: Mon, 24 Aug 2015 14:20:48 -0500; While we're on 3 cx800s, after some good advice I've decided to rebuild my old Alpha 374 with just a single 3cx800, as I don't run more than 700 -800 watts anyway. I've worked out the mechanics and a; /archives//html/Amps/2015-08/msg00082.html (9,353 bytes)
11. Re: [Amps] Amp output power (score: 1): Author: Kevin Stover <kevin.stover@mediacombb.net>; Date: Mon, 24 Aug 2015 15:03:51 -0500; Maybe it's a combination of the dainty 4W grid and the small physical size. It's not a very big tube. Those numbers came straight from the data sheet so I'll bet they contain some institutional "fudg; /archives//html/Amps/2015-08/msg00083.html (9,665 bytes)
12. Re: [Amps] Amp output power (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Mon, 24 Aug 2015 22:31:06 +0100; If you check at http://www.g8wrb.org/triodes/ there's several data sheets. I came across a copy of the one with 1370W output spec. and copied it to David to host. I believe there was a spell where FC; /archives//html/Amps/2015-08/msg00084.html (9,443 bytes)
13. Re: [Amps] Amp output power (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 25 Aug 2015 02:38:25 -0400; The early datasheets showed larger figures than the later ones. Yes, I believe the derating was a political move to make the FCC happy<:-) Just remember when running near maximum ratings and particul; /archives//html/Amps/2015-08/msg00085.html (11,054 bytes)
14. Re: [Amps] Amp output power (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Aug 2015 01:23:10 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: The 3CX800 seems pretty fragile to me. For about the price of a pair of those you can get a single 8877 with its 25 watt grid dissipation and not have to; /archives//html/Amps/2015-08/msg00086.html (8,289 bytes)
15. Re: [Amps] Amp output power (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 25 Aug 2015 08:51:40 -0400; I think I've seen, new imported 8877s of reported good quality for the price of two tested, 3CX800 pulls. 73 Roger (K8RI) It's a good idea to have sensitive and quick acting over drive protection. RE; /archives//html/Amps/2015-08/msg00087.html (9,228 bytes)
16. Re: [Amps] Amp output power (score: 1): Author: "Fern Rivard" <crc@cyberlink.ca>; Date: Mon, 24 Aug 2015 15:09:31 -0600; An alpha 86 with a pair of eimac regular 3CX800A7 can easily put out 1500 watts without any issues. Fern VE7GZ Maybe it's a combination of the dainty 4W grid and the small physical size. It's not a v; /archives//html/Amps/2015-08/msg00088.html (10,773 bytes)
17. Re: [Amps] Amp output power (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Aug 2015 09:35:03 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: I paid just over $500 for a Pride brand (Chinese) 8877 about four years ago and it now has hundreds of hours of RTTY contesting on it and still has full; /archives//html/Amps/2015-08/msg00089.html (8,801 bytes)
18. Re: [Amps] Amp output power (score: 1): Author: "Mike Feher" <n4fs@eozinc.com>; Date: Tue, 25 Aug 2015 13:13:57 -0400; Bill - How about a pair of 4-400As as I have 10 NOS ones in original boxes. It is also used in my T-368F and does a nice job there. I also have a bunch of PL-172s or 8295s and a pair of those would m; /archives//html/Amps/2015-08/msg00090.html (10,343 bytes)
19. Re: [Amps] Amp output power (score: 1): Author: Mark K5AM <k5am@zianet.com>; Date: Tue, 25 Aug 2015 17:30:27 +0000; How about a pair of 4-400As ... Yes, the Eimac 4-400A is a good tube. Still running at full output after 54 years, with the original tubes: http://www.zianet.com/k5am/amps/6mkw.html Input for full o; /archives//html/Amps/2015-08/msg00091.html (9,304 bytes)
20. Re: [Amps] Amp output power (score: 1): Author: Bill Turner <dezrat@outlook.com>; Date: Tue, 25 Aug 2015 10:49:31 -0700; -- ORIGINAL MESSAGE --(may be snipped) REPLY: A lot of this is personal preference. I prefer triodes for simplicity and I prefer ceramic over glass for resistance to air leakage. Ceramic to metal see; /archives//html/Amps/2015-08/msg00092.html (8,943 bytes)

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