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1. [Amps] 3-500Z heater voltage reduction (score: 1): Author: MIKE DURKIN <patriot121@msn.com>; Date: Tue, 15 Sep 2009 12:03:21 -0700; Ok.. yea i did search some on reducing the voltage at the heaters on google ... yikes alot of what in not really looking for.So a quick question .. what is the favored way to reduce the voltage ?? i; /archives//html/Amps/2009-09/msg00205.html (8,148 bytes)
2. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: mikea <mikea@mikea.ath.cx>; Date: Tue, 15 Sep 2009 14:07:18 -0500; A small variac off the power line into the filament transformer? May cost as much as $50, but that's cheap compared to a pair of 3-500Z. You could stick an AC voltmeter across the filaments, too, and; /archives//html/Amps/2009-09/msg00206.html (8,519 bytes)
3. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: Kevin LaHaie <klahaie@centricata.com>; Date: Tue, 15 Sep 2009 12:26:43 -0700; Hi Mike I think all the wire sizes you mentioned are too large, and the resistor might be right on the edge dissipation wise. I just went through this, and reduced the filament voltage on my Henry 3K; /archives//html/Amps/2009-09/msg00207.html (10,131 bytes)
4. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 15 Sep 2009 18:33:37 -0400; Just coil up some #10 magnet wire and put in series with the xfmr end of the filament choke, it wont take much. #12 will get pretty warm and can be used if there is air flow. You dont want to use cop; /archives//html/Amps/2009-09/msg00214.html (9,549 bytes)
5. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 16 Sep 2009 06:50:38 +0800; No, you want to drop it by 2 Volts. With 1 Volt, you are still 10% high. That's way too much! To destroy 2 Volts at 15 Amps so you need a resistance of 0.133 Ohms in series with the filaments. The re; /archives//html/Amps/2009-09/msg00215.html (9,703 bytes)
6. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 15 Sep 2009 19:48:38 -0400; Using small wire will eventually anneal it and change the resistance during the process. Better to use the proper size. And its 30A, not 15 for 2 tubes. Carl KM1H ____________________________________; /archives//html/Amps/2009-09/msg00217.html (11,299 bytes)
7. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 16 Sep 2009 07:54:06 +0800; Yeah, you are right about the 30A for 2 tubes but this fellow mentioned that he measured 12V across the filaments so I assumed he was running them in series which gets us back to the 15A value. 73, A; /archives//html/Amps/2009-09/msg00219.html (12,021 bytes)
8. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 15 Sep 2009 20:10:19 -0400; My goof! Carl _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-09/msg00220.html (13,095 bytes)
9. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 15 Sep 2009 22:55:37 -0500; Put the resistor in the primary of the filament transformer. This gives you a free step-start; the in-rush current will be reduced. Get a 25 ohm 50 watt resistor with a slider to adjust the voltage.; /archives//html/Amps/2009-09/msg00222.html (8,763 bytes)
10. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 16 Sep 2009 12:08:17 +0800; Yep, the resistor in the primary is the ideal way to go. I have a fixed value 22 Ohm resistor in my 3-500 amp and as Phil says, it doubles as a soft start. Alek, VK6APK PS: Mike, I just looked you up; /archives//html/Amps/2009-09/msg00223.html (9,590 bytes)
11. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: R Johnson <rjohnson@tmlp.com>; Date: Fri, 18 Dec 2009 01:06:32 -0500; Carl: How about some NICHROME wire ??? Might just work !!! OK, Just kidding. Old joke on the list for "Cure All's" for what ailing amplifiers !!! 73 Bob, K1VU FN42ma At 05:33 PM 9/15/2009, Carl wrote; /archives//html/Amps/2009-12/msg00419.html (9,582 bytes)
12. Re: [Amps] 3-500Z heater voltage reduction (score: 1): Author: MIKE DURKIN <patriot121@msn.com>; Date: Fri, 18 Dec 2009 07:18:58 -0800; Wow, thought this thread died a few months ago .... so this is what i did. I used 8 10W .33Ohm non-inductive resistors (it was what i could find for cheap) 2 X 4 paralleled ..... for a total of 0.165; /archives//html/Amps/2009-12/msg00427.html (10,429 bytes)

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