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1. [Amps] filament transformers (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 15 May 2009 20:40:02 +0000 (UTC); Hello builders, My amp continues to grow. I'm trying to pick out a filament transformer, such and easy task. The amp is based on a 3cx800a7 which requires 13.5V +- 0.6V at 1.5A. I was thinkin; /archives//html/Amps/2009-05/msg00068.html (8,062 bytes)
2. Re: [Amps] filament transformers (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Fri, 15 May 2009 13:54:58 -0700; ORIGINAL MESSAGE: REPLY: The three amp version would be my choice, especially if you can place it somewhere in the amp or power supply where it would get a small amount of air flow around it. I would; /archives//html/Amps/2009-05/msg00069.html (7,853 bytes)
3. Re: [Amps] filament transformers (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 15 May 2009 17:07:47 -0400; Why not call Jim, W4LNI here in Tampa, FL. He will make you a custom designed transformer to meet your requirements. His number is 813.876.5531. He has built several transformers for me and his quali; /archives//html/Amps/2009-05/msg00070.html (8,901 bytes)
4. Re: [Amps] filament transformers (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 May 2009 18:58:15 -0400; Get the 3A version and measure the voltage at the socket. If its high (which it should be) wind some wire on a small ferrite rod which can also double as a filament choke. When you go to the 2nd tube; /archives//html/Amps/2009-05/msg00071.html (10,091 bytes)
5. Re: [Amps] filament transformers (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sat, 16 May 2009 07:08:26 +0800; Go for a larger one as the "off the shelf" transformers most likely are NOT rated for continuous duty at the nominal 3A or 4A. In other words, they'll probably cook when put into service as a filamen; /archives//html/Amps/2009-05/msg00072.html (9,449 bytes)
6. Re: [Amps] filament transformers (score: 1): Author: vk3pa@vk3pa.com; Date: Fri, 15 May 2009 18:19:07 -0500; I would say check out your primary supply volts first. My is 240v es swings +/- 6%.. A mate his primary supply is 252v constant, this all effects ur secondary voltage,, here I use a constant voltage; /archives//html/Amps/2009-05/msg00073.html (8,430 bytes)
7. Re: [Amps] filament transformers (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 15 May 2009 19:36:01 -0400; Waste money on a custom filament transformer? I'm not talking about a $100 transformer, maybe $35. If you can't afford that maybe you shouldn't be building homebrew amps. ____________________________; /archives//html/Amps/2009-05/msg00074.html (11,245 bytes)
8. Re: [Amps] filament transformers (score: 1): Author: "Jim W7RY" <w7ry@arrl.net>; Date: Fri, 15 May 2009 17:25:05 -0700; When you put a pot in series with the primary of the transformer, it acts like a step start resistor. As the filament warms up, it draws less current. I used a 150 ohm pot 15 watts in the primary of; /archives//html/Amps/2009-05/msg00075.html (9,986 bytes)
9. Re: [Amps] filament transformers (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 15 May 2009 22:20:59 -0400; A friend recently got stiffed from that source for an 8877 filament xfmr, it was almost $100. He didnt think to check out the $33 Hammond. Carl KM1H _______________________________________________ Am; /archives//html/Amps/2009-05/msg00076.html (12,587 bytes)
10. Re: [Amps] filament transformers (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Fri, 15 May 2009 22:57:01 -0400; Carl, I'm beginning to think that everything I've read about you on the reflector is true. You make a derogatory comment about W4LNI and now you say "leave me out of it". Give me a break. ___________; /archives//html/Amps/2009-05/msg00077.html (16,293 bytes)
11. [Amps] filament transformers (score: 1): Author: robert briggs <vk3zl@bigpond.com>; Date: Sat, 16 May 2009 18:53:07 +1000; What has happened to "roll your own" custom filament transformers? I have never purchased a commercially made filament transformer after building more than 40 amplifiers over 25 years....I still roll; /archives//html/Amps/2009-05/msg00078.html (8,355 bytes)
12. Re: [Amps] filament transformers (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 16 May 2009 08:02:44 -0400; Well Bob, since you just violated the cardinal rule of email etiquette I might say similar about you. OTOH, if you had simply asked me privately who the person was I would have told you. Since you fe; /archives//html/Amps/2009-05/msg00079.html (18,713 bytes)
13. Re: [Amps] filament transformers (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 16 May 2009 08:33:21 -0400; Good points Bob, its been decades since I tried to get the last lamination back in! With homebrew almost a lost art in the USA Ive found most of my LV needs at hamfests for very little money. A find; /archives//html/Amps/2009-05/msg00080.html (10,763 bytes)
14. Re: [Amps] filament transformers (score: 1): Author: "Bill, W6WRT" <dezrat1242@yahoo.com>; Date: Sat, 16 May 2009 05:42:25 -0700; ORIGINAL MESSAGE: REPLY: That's really a lost art here in the States. I've been hamming since 1957 and have never known anyone (until now) who rolled his own. More power (sic) to you! 73, Bill W6WRT; /archives//html/Amps/2009-05/msg00081.html (8,827 bytes)
15. Re: [Amps] filament transformers (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Sat, 16 May 2009 20:54:16 +0800; That's because you guys in the US have greater access to many things amplifiers. The rest of the world has to make do and adapt what is available or pay a premium price for what you guys throw out as; /archives//html/Amps/2009-05/msg00082.html (9,027 bytes)
16. [Amps] filament transformers (score: 1): Author: robert briggs <vk3zl@bigpond.com>; Date: Sat, 16 May 2009 23:03:41 +1000; You are right Carl...I have always had the roving eye at hamfests and disposal stores..I once brought 5 new Jennings vac variables, 5-500pf for one dollar each at a disposals place...When I took them; /archives//html/Amps/2009-05/msg00083.html (9,062 bytes)
17. Re: [Amps] filament transformers (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sat, 16 May 2009 13:34:36 +0000; Hi, I'm sure we all have different 'first' memories, but mine happen to be sitting at a table placing 'T' and 'U' shaped laminations into bobbins that my father had wound on a winding machine he had; /archives//html/Amps/2009-05/msg00084.html (8,648 bytes)
18. Re: [Amps] filament transformers (score: 1): Author: ToddRoberts2001@aol.com; Date: Sat, 16 May 2009 10:29:45 EDT; What has happened to "roll your own" custom filament transformers? I have never purchased a commercially made filament transformer after building more than 40 amplifiers over 25 years....I still roll; /archives//html/Amps/2009-05/msg00085.html (10,579 bytes)
19. Re: [Amps] filament transformers (score: 1): Author: Chris Pedder <chris@g3vbl.co.uk>; Date: Sat, 16 May 2009 14:36:34 +0000; Hi, I'm sure we all have different 'first' memories, but mine happen to be sitting at a table placing 'T' and 'U' shaped laminations into bobbins that my father had wound on a winding machine he had; /archives//html/Amps/2009-05/msg00086.html (8,564 bytes)
20. Re: [Amps] filament transformers (score: 1): Author: "Jim W7RY" <w7ry@arrl.net>; Date: Sat, 16 May 2009 07:50:22 -0700; My homebrew 3CX800 amplifier filament transformer started with a 3 amp 12 volt Radio Shack transformer. I did not have enough voltage so I simply added a few turns and increased the voltage for the t; /archives//html/Amps/2009-05/msg00087.html (11,293 bytes)

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