How hot do Hammond chokes get?

bayermar · 18th April 2008, 11:22 PM

Hi everyone,

I could not find an answer by searching the archive, so I have to start a new thread (if this comes up regularly please be patient

).

I was wondering how hot the small Hammond chokes get at the rated current. Specifically the model 156R. Its a small open bracket, 1.5H 200mA choke. It will be used @ ~300Volt.
Has anyone used this one before?

I would like to put it in the chassis (not well ventilated) but I do not want to toast the other components in there.
If it gets "hand-warm" I wouldn't mind but if I can sizzle burgers on it I would rather use a beefier one.

If I understand the physics of a choke input power supply correctly the voltage is adjusted by "phase shifting", therefore there should not be too much dissipation loss in the choke?!?
Do I use the DC resistance to calculate that?
Sorry, for my ignorance but I always tried to avoid inductors (especially the math

)

Thank you for any input.

Cheers,
Martin

sorenj07 · 19th April 2008, 12:29 AM

Unless you're grossly abusing them I've never found chokes to get any more than warm to the touch.

Geek · 19th April 2008, 03:18 AM

Hi,

I've abused Hammond NOS chokes pretty bad and they never even got warm enough for the "be able to hold for 10 seconds and you're OK" rule of thumb for iron I go by.

Cheers!

tommcnally · 19th April 2008, 07:57 AM

By the way Martin - Triode Electronics has a shielded choke with the same specs as the 156R. I've used that in a few of my amps.

bayermar · 21st April 2008, 03:06 PM

Hey guys,

thank you so much for the replies.
I will not abuse those chokes. So I think I should not to worry about them too much.
@tommcnally
Thanks for the info. That is something I will have a look at.

Martin

18th April 2008, 11:22 PM	#1
bayermar diyAudio Member Join Date: Oct 2007 Location: Tuebingen	How hot do Hammond chokes get? Hi everyone, I could not find an answer by searching the archive, so I have to start a new thread (if this comes up regularly please be patient ). I was wondering how hot the small Hammond chokes get at the rated current. Specifically the model 156R. Its a small open bracket, 1.5H 200mA choke. It will be used @ ~300Volt. Has anyone used this one before? I would like to put it in the chassis (not well ventilated) but I do not want to toast the other components in there. If it gets "hand-warm" I wouldn't mind but if I can sizzle burgers on it I would rather use a beefier one. If I understand the physics of a choke input power supply correctly the voltage is adjusted by "phase shifting", therefore there should not be too much dissipation loss in the choke?!? Do I use the DC resistance to calculate that? Sorry, for my ignorance but I always tried to avoid inductors (especially the math ) Thank you for any input. Cheers, Martin

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19th April 2008, 12:29 AM	#2
sorenj07 diyAudio Member Join Date: May 2006	Unless you're grossly abusing them I've never found chokes to get any more than warm to the touch.

19th April 2008, 03:18 AM	#3
Geek diyAudio Member Join Date: Sep 2004	Hi, I've abused Hammond NOS chokes pretty bad and they never even got warm enough for the "be able to hold for 10 seconds and you're OK" rule of thumb for iron I go by. Cheers!

19th April 2008, 07:57 AM	#4
tommcnally diyAudio Member Join Date: Jul 2007	By the way Martin - Triode Electronics has a shielded choke with the same specs as the 156R. I've used that in a few of my amps.

21st April 2008, 03:06 PM	#5
bayermar diyAudio Member Join Date: Oct 2007 Location: Tuebingen	Hey guys, thank you so much for the replies. I will not abuse those chokes. So I think I should not to worry about them too much. @tommcnally Thanks for the info. That is something I will have a look at. Martin

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