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1. [Amps] 6C21 (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Fri, 29 Jan 2010 11:45:31 -0700; Carl & Roger: I'm really not arguing with you here. However, comparing a 6C21 to a 750T runs contrary to what I know about the tubes. An older, local ham gave me a NIB pair of 6C21s about 25 years ag; /archives//html/Amps/2010-01/msg00435.html (9,220 bytes)
2. Re: [Amps] 6C21 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 29 Jan 2010 14:25:00 -0500; data decades ago it can be considered a cross between an Eimac 450 and 750 with a static Pd capability of around 600W. While not a complete answer its filament power does fall between the two. I don; /archives//html/Amps/2010-01/msg00437.html (11,386 bytes)
3. Re: [Amps] 6C21 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Fri, 29 Jan 2010 14:39:23 -0500; I can't find the thread or initial question leading to this but you are right. It is practically the same as a 450T. different filament voltage and current and slightly different mu. The 6c21 has a p; /archives//html/Amps/2010-01/msg00438.html (10,907 bytes)
4. Re: [Amps] 6C21 (score: 1): Author: "Barrie Smith" <barrie@centric.net>; Date: Fri, 29 Jan 2010 13:22:27 -0700; The filament voltage for the 6C21 in pulse service is 8.3 volts. For normal service it is 7.5 volts. 73, Barrie, W7ALW I can't find the thread or initial question leading to this but you are right. I; /archives//html/Amps/2010-01/msg00448.html (11,428 bytes)
5. Re: [Amps] 6C21 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 29 Jan 2010 15:48:39 -0500; I suspect that Orr wrote the filament specs for a common available transformer. I also dont understand derating it for ham service. Machlett designed it as 8.2V @ 18.8A, maybe Eimac made an "improvem; /archives//html/Amps/2010-01/msg00455.html (9,701 bytes)
6. Re: [Amps] 6C21 (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Fri, 29 Jan 2010 15:58:34 -0500; Emission at either voltage is not a problem<:-)) I don't remember the emission limit, but it's way past several amps and the filament voltage is not critical. 73 Roger (K8RI) ________________________; /archives//html/Amps/2010-01/msg00456.html (12,699 bytes)
7. Re: [Amps] 6C21 (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Fri, 29 Jan 2010 22:23:18 -0500; I found a application note by Bill Orr on the tube and it even specs the tube for cathode driven AB2. For about 100 watts drive it produces 900 watts output. I believe the filament was 8.3 volts. I n; /archives//html/Amps/2010-01/msg00472.html (13,666 bytes)
8. Re: [Amps] 6C21 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 29 Jan 2010 22:30:02 -0500; That link was posted earlier today. I already have the hard copy so didnt save the info. Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2010-01/msg00473.html (15,169 bytes)
9. Re: [Amps] 6C21 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 29 Jan 2010 22:32:23 -0500; Hmmmm, look below, it was you who posted the link earlier! http://home.comcast.net/~n6jv/data/6C21.pdf Carl _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2010-01/msg00474.html (15,282 bytes)

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