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1. [Amps] filament choke questions (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 7 Oct 2009 15:45:03 +0000 (UTC); Hi Guys, I'm making more and more progress on my amp, thanks for all of the help answering questions and such, it's appreciated. Some have asked for pictures, I'll post some shortly. "RFC2 - 14 tur; /archives//html/Amps/2009-10/msg00131.html (7,926 bytes)
2. Re: [Amps] filament choke questions (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Thu, 8 Oct 2009 13:59:07 +0900; Hi Paul Just have survived strong wind of typhoon 18 here. The purpose of the filament choke for 3CX800A7 is, to keep filament's RF potential neutral, to avoid a breakdown of cathode-heater insulatio; /archives//html/Amps/2009-10/msg00133.html (8,912 bytes)
3. Re: [Amps] filament choke questions (score: 1): Author: Roger Parsons <ve3zi@yahoo.com>; Date: Thu, 8 Oct 2009 04:43:29 -0700 (PDT); Whilst the explanation below makes perfect sense, I have 1kW and 500W ex commercial FM (100 MHz) broadcast transmitters made by CCI - the former uses an 8877 and the latter a 3CX800A7. Neither of the; /archives//html/Amps/2009-10/msg00135.html (9,440 bytes)
4. Re: [Amps] filament choke questions (score: 1): Author: Don Kessler <ki6sz@sbcglobal.net>; Date: Thu, 8 Oct 2009 19:57:51 -0400; Interesting... I recently completed redesign of several amps, all are single and two-tube amps using the Eimac (CPI) 3CPX800A7. The datasheet for this tube as well as for the 8877 states that both fi; /archives//html/Amps/2009-10/msg00146.html (8,788 bytes)
5. Re: [Amps] filament choke questions (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 8 Oct 2009 20:24:04 -0400; The same answer applies to the 8877 family. On HF its usually not required and ham amp manufacturers are notoriously cheap. On VHF it makes a difference especially in a 3 hole 3CPX800A7 conversion of; /archives//html/Amps/2009-10/msg00147.html (10,130 bytes)
6. Re: [Amps] filament choke questions (score: 1): Author: Don Kessler <ki6sz@sbcglobal.net>; Date: Thu, 8 Oct 2009 20:29:15 -0400; Interesting... We recently finished redesign of several RF amps, all using the 3CPX800A7. The original amps all had one filament lead tied directly to the chassis without any filament choke. The othe; /archives//html/Amps/2009-10/msg00148.html (9,290 bytes)
7. Re: [Amps] filament choke questions (score: 1): Author: Martin <martin@ok1rr.com>; Date: Fri, 09 Oct 2009 15:33:40 +0200; The Harris AM7224/URC (RF-353) employs the 8877 also without any filament choke. Works. 73 Martin, OK1RR Carl napsal(a): _______________________________________________ Amps mailing list Amps@contest; /archives//html/Amps/2009-10/msg00151.html (10,725 bytes)
8. Re: [Amps] filament choke questions (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Fri, 09 Oct 2009 09:40:22 -0700; ORIGINAL MESSAGE: REPLY: Very little shunting to ground will be taking place. The capacitance merely becomes part of the tuned input circuit. Having said that however, I agree with others that a fila; /archives//html/Amps/2009-10/msg00153.html (8,177 bytes)

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