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Total 13 documents matching your query.

1. [Amps] 8877 Filament choke (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Thu, 15 Nov 2007 14:26:32 +0000; Info in the ARRL handbook seems to indicate that it might be better to not use a filament choke on an 8877 amplifier, that it might cause more problems than it solves. I wonder what you guys who have; /archives//html/Amps/2007-11/msg00202.html (7,222 bytes)
2. Re: [Amps] 8877 Filament choke (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 15 Nov 2007 09:59:28 -0500; With an indirectly heated cathode you don't need a filament choke, in the HF region. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2007-11/msg00204.html (7,970 bytes)
3. Re: [Amps] 8877 Filament choke (score: 1): Author: Gudguyham@aol.com; Date: Thu, 15 Nov 2007 11:35:30 EST; With an indirectly heated cathode you don't need a filament choke, in the HF region. Bob W6TR No you don't. You must isolate the cathode from the filament and feed the bias to the cathode vai a smal; /archives//html/Amps/2007-11/msg00205.html (7,067 bytes)
4. Re: [Amps] 8877 Filament choke (score: 1): Author: Gudguyham@aol.com; Date: Thu, 15 Nov 2007 11:38:57 EST; Info in the ARRL handbook seems to indicate that it might be better to not use a filament choke on an 8877 amplifier, that it might cause more problems than it solves. I wonder what you guys who have; /archives//html/Amps/2007-11/msg00206.html (6,733 bytes)
5. Re: [Amps] 8877 Filament choke (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Thu, 15 Nov 2007 17:41:42 -0500; What about when running one on 6-meters? Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-11/msg00210.html (8,777 bytes)
6. Re: [Amps] 8877 Filament choke (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 15 Nov 2007 18:13:28 -0500; Beats me. I've never been on 6, not since 1961 anyway. A lot of builders install a filament choke on a 8877 amp, example my Henry 4K Ultra, which runs a single 8877, had a filament choke. I'm not sur; /archives//html/Amps/2007-11/msg00211.html (10,458 bytes)
7. Re: [Amps] 8877 Filament choke (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Thu, 15 Nov 2007 18:17:26 -0500; Oh, BTW, Bill shows a 8877 built for 6M and it does use a filament choke in series with the filament. Same book page 22.71 Bob W6TR -- Original Message -- From: "Roger" <sub1@rogerhalstead.com> To: "; /archives//html/Amps/2007-11/msg00212.html (10,007 bytes)
8. Re: [Amps] 8877 Filament choke (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 15 Nov 2007 18:29:14 -0500; 6M is VHF, use a choke there and on higher bands. A 4" 43 mix 1/2" ferrrite rod about 75% filled with #14 works well. Smaller wire can be used if you have to fine tune the filament voltage. Carl KM1H; /archives//html/Amps/2007-11/msg00214.html (10,287 bytes)
9. Re: [Amps] 8877 Filament choke (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Fri, 16 Nov 2007 00:05:21 +0000; Thanks for all the opinions Guys. I went back and read the stuff in the ARRL handbook about this subject and it appears they are concerned about a series resonance with the choke and capacitance that; /archives//html/Amps/2007-11/msg00215.html (10,072 bytes)
10. Re: [Amps] 8877 Filament choke (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 15 Nov 2007 18:18:54 -0600; so the cathode should be connected to the filament circuit. Should there be a glitch a cathode choke could open and destroy the tube via a cathode filament short. 73 Gary K4FMX _____________________; /archives//html/Amps/2007-11/msg00216.html (11,701 bytes)
11. Re: [Amps] 8877 Filament choke (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Fri, 16 Nov 2007 00:55:26 +0000 (GMT); For what it's worth, my remote station amplifier is based on an old (~1970) CSI 1kW FM (100MHz) broadcast transmitter that used an 8877 in the final. It did not originally have a filament choke - and; /archives//html/Amps/2007-11/msg00217.html (7,148 bytes)
12. Re: [Amps] 8877 Filament choke (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Thu, 15 Nov 2007 22:34:05 -0500; Thanks, I just might have that edition down in the basement...some where. Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2007-11/msg00218.html (11,151 bytes)
13. Re: [Amps] 8877 Filament choke (score: 1): Author: "Saandy Eban" <alexeban@gmail.com>; Date: Fri, 16 Nov 2007 08:44:55 +0200; ...for the most part, these amplifiers operate the 8877 in grounded grid configuration. As such, the input circuit is supposed to be above ground RFwise. Now, the capacitance between the cathode and; /archives//html/Amps/2007-11/msg00219.html (13,154 bytes)

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