Two chokes in one pot?

vax9000 · 7th June 2006, 05:19 AM

Are two chokes in one pot coupled to each other? There are 3 leads. If I use it to filter the B+ for my tube amplifier, is it a good idea to use one choke in the pot for one channel, and one for the other?

kwantam · 7th June 2006, 06:30 AM

Do you have a part number or some other reference that would indicate exactly which choke pair you're talking about?

In general, the (physically) closer the chokes are the more flux they'll couple, i.e., the greater their mutual inductance. It's possible to build them at right angles and in separate magnetic circuits such that they couple only a very small bit, but fundamentally if they're close, they're very likely to leak to one another more than if they were further apart, all other things being equal.

-kwantam

EC8010 · 7th June 2006, 09:42 AM

They're almost certainly wound on the same core and you're looking at a choke with a tapping. If you have a means of measuring inductance, first measure all three possible resistances (you will probably have one large resistance that is equal to the sum of the other two). The measure all three inductances. You will almost certainly have one large inductance that is rather larger than the sum of the other two, and this indicates coupling between the coils.

So, the short answer is, no, you can't use one for one channel and one for the other.

7th June 2006, 05:19 AM	#1
vax9000 diyAudio Member Join Date: May 2006 Location: Cleveland	Two chokes in one pot? Are two chokes in one pot coupled to each other? There are 3 leads. If I use it to filter the B+ for my tube amplifier, is it a good idea to use one choke in the pot for one channel, and one for the other?

7th June 2006, 09:42 AM	#3
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	They're almost certainly wound on the same core and you're looking at a choke with a tapping. If you have a means of measuring inductance, first measure all three possible resistances (you will probably have one large resistance that is equal to the sum of the other two). The measure all three inductances. You will almost certainly have one large inductance that is rather larger than the sum of the other two, and this indicates coupling between the coils. So, the short answer is, no, you can't use one for one channel and one for the other. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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7th June 2006, 06:30 AM	#2
kwantam diyAudio Member Join Date: Jan 2006 Location: usa	Do you have a part number or some other reference that would indicate exactly which choke pair you're talking about? In general, the (physically) closer the chokes are the more flux they'll couple, i.e., the greater their mutual inductance. It's possible to build them at right angles and in separate magnetic circuits such that they couple only a very small bit, but fundamentally if they're close, they're very likely to leak to one another more than if they were further apart, all other things being equal. -kwantam

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