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1. [Amps] Regulated DC heater (score: 1): Author: Mark K5AM <k5am@zianet.com>; Date: Sat, 24 Jan 2009 17:30:26 +0000; Gary ZL2IFB wrote: I'm contemplating how best to regulate the filament voltages on my amps, and curious as to whether it's possible to use a regulated DC supply . . . - - - - - - - - - - - - - - 73,; /archives//html/Amps/2009-01/msg00279.html (6,701 bytes)
2. Re: [Amps] Regulated DC heater (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sun, 25 Jan 2009 06:29:11 +0800; use special transformer(CVT) 73!Hsu -- Original Message -- From: "Mark K5AM" <k5am@zianet.com> To: <amps@contesting.com> Sent: Sunday, January 25, 2009 1:30 AM Subject: [Amps] Regulated DC heater ___; /archives//html/Amps/2009-01/msg00283.html (7,734 bytes)
3. Re: [Amps] Regulated DC heater (score: 1): Author: Missouri Guy <n0tt1@juno.com>; Date: Mon, 26 Jan 2009 16:09:38 +0000; Hi Gents, Just for some future info here....If I use regulated DC to power the filaments on any tube, and let's say the required voltage is 5 volts AC, shouldn't (or couldn't) the DC value be 5 x .70; /archives//html/Amps/2009-01/msg00297.html (9,022 bytes)
4. Re: [Amps] Regulated DC heater (score: 1): Author: Robert Groh <rgroh@swbell.net>; Date: Mon, 26 Jan 2009 08:53:37 -0800 (PST); I don't think so, Charlie. The filament AC voltage given by the manufacturer's is the 'AC RMS' value and hence is (given no distortion in the AC waveform) identical to the DC value. Bottom line: the; /archives//html/Amps/2009-01/msg00299.html (7,666 bytes)
5. Re: [Amps] Regulated DC heater (score: 1): Author: "alexeban" <alexeban@gmail.com>; Date: Mon, 26 Jan 2009 19:01:08 +0200; ...definitely NO! Remember: by definition the RMS voltage is already equal to the DC voltage that does the same work. That means 5V RMS is equal to 5VDC! The RMS value of a 7 Volt peak source would b; /archives//html/Amps/2009-01/msg00300.html (10,475 bytes)
6. Re: [Amps] Regulated DC heater (score: 1): Author: Missouri Guy <n0tt1@juno.com>; Date: Mon, 26 Jan 2009 17:05:47 +0000; D'Oh! You're right Bob...RMS=DC "heating" value...Shoulda thought about it some more before posting. Thanks, Charlie 73 Bob, WA2CKY Hi Gents, Just for some future info here....If I use regulated DC t; /archives//html/Amps/2009-01/msg00301.html (7,956 bytes)
7. Re: [Amps] Regulated DC heater (score: 1): Author: <d.cutter@ntlworld.com>; Date: Mon, 26 Jan 2009 18:18:02 +0000; Charlie It is convention to quote ALL voltages in rms values unless otherwise stated. Therefore, 5V ac has the same heating effect as 5V dc. David G3UNA ______________________________________________; /archives//html/Amps/2009-01/msg00302.html (8,233 bytes)
8. Re: [Amps] Regulated DC heater (score: 1): Author: Dave <mausoptik@btinternet.com>; Date: Mon, 26 Jan 2009 18:46:02 +0000; You took the words from my mouth......but a good question to put in the ham exam question pool don't you think? Cheers Dave G0OIL / K2MOO Charlie It is convention to quote ALL voltages in rms values; /archives//html/Amps/2009-01/msg00303.html (8,767 bytes)

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