Anode chokes DIY?

dshortt9 · 27th February 2009, 04:47 PM

C-cores are available on e-bay.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=260368475588

How would I wind some 100HY 30ma. anode chokes?

Wire size? Turns? Gap?

Is any sectioning or interleaving needed? I'm obviously a newbie at this, but it should be much easier than winding a full transformer.

HELP!

nhuwar · 27th February 2009, 06:31 PM

Your looking at a substantial task to wind an anode choke, As for you question about core gap and winding you need to know what type of core material it is and the inductance per 1000 turns, this is a common rating on cores. As for the gap it's all math dealing with the max flux density.

As for the wire size you spec it to your current and the size of the window. To save your high frequency response yes you will need some funky voodoo winding magic to cut down the capacitance.

I think the you find the max flux density the core can take then compare it to the field being set up by the coil and increase the gap tell they don't equal each other of the at least the field setup by the coil doesn't equal the saturation of the core.

But I could be wrong, there are other guru's way smarter then me that could probably give you a less confusing answer.

Nick

smoking-amp · 27th February 2009, 07:17 PM

It takes 1000s of turns typically for tube type impedances. And the cost of the tiny copper wire is by far the major factor these days. I suspect the cores are rather overpriced too since they are making a big deal about "audio". Many lamination manufacturers will send you a core sample or two for free for prototyping.

dsavitsk · 27th February 2009, 08:00 PM

100H 30mA anode chokes are $56 from Electra-Print. If you are winding your own to learn, that's one thing, but if it is to save money it is likely a losing battle.

dshortt9 · 27th February 2009, 09:16 PM

It was both price and finding the right value. After weighing the options Electra-Print fits the bill. Thanks for the link. Lundahl 1668's are close but they spec at 25ma. and are twice the price.

nhuwar · 28th February 2009, 03:22 AM

Ya I would buy one. I would not want to wind one. Unless you really want to punish your self for something LOL, I don't like bleeding fingers.

Nick

27th February 2009, 04:47 PM	#1
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	Anode chokes DIY? C-cores are available on e-bay. http://cgi.ebay.com/ws/eBayISAPI.dll...m=260368475588 How would I wind some 100HY 30ma. anode chokes? Wire size? Turns? Gap? Is any sectioning or interleaving needed? I'm obviously a newbie at this, but it should be much easier than winding a full transformer. HELP!

27th February 2009, 07:17 PM	#3
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	It takes 1000s of turns typically for tube type impedances. And the cost of the tiny copper wire is by far the major factor these days. I suspect the cores are rather overpriced too since they are making a big deal about "audio". Many lamination manufacturers will send you a core sample or two for free for prototyping. __________________ Ohms Law V = I R

27th February 2009, 08:00 PM	#4
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	100H 30mA anode chokes are $56 from Electra-Print. If you are winding your own to learn, that's one thing, but if it is to save money it is likely a losing battle. __________________ http://www.ecpaudio.com

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27th February 2009, 06:31 PM	#2
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Your looking at a substantial task to wind an anode choke, As for you question about core gap and winding you need to know what type of core material it is and the inductance per 1000 turns, this is a common rating on cores. As for the gap it's all math dealing with the max flux density. As for the wire size you spec it to your current and the size of the window. To save your high frequency response yes you will need some funky voodoo winding magic to cut down the capacitance. I think the you find the max flux density the core can take then compare it to the field being set up by the coil and increase the gap tell they don't equal each other of the at least the field setup by the coil doesn't equal the saturation of the core. But I could be wrong, there are other guru's way smarter then me that could probably give you a less confusing answer. Nick

27th February 2009, 09:16 PM	#5
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	It was both price and finding the right value. After weighing the options Electra-Print fits the bill. Thanks for the link. Lundahl 1668's are close but they spec at 25ma. and are twice the price.

28th February 2009, 03:22 AM	#6
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	Ya I would buy one. I would not want to wind one. Unless you really want to punish your self for something LOL, I don't like bleeding fingers. Nick

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