Ferrite Pot Core

Well..... 3B7 is a grade of ferrite. You'll want the same or compatible.

You will have to identify the specific pot core from the dimensions. Since it's a Ferroxcube ferrite, I suggest you start there. A distributor might be able to help too.

Graham

And check if it's been 'gapped'. Otherwise you'll have to start from scratch.

Graham

:We're trying to find a replacement ferrite pot core. The core is just :like the type shown in this picture: :

Most likely a P11/7 with a zero air gap. If both halves are identical to the one on the right then it will be most likely be ungapped. If gapped, one half should have a threaded insert to take an adjuster slug.

The current Ferroxcube data sheet doesn't include 3B7 material since this is obsolete. In 2003 they recommended 3H3 as its replacement, but as you will see from the data sheet 3H3 is also superseded. You should still be able to get them though.

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Thanks for the great replies. Neither side has threads, there was no adjuster slug. The dimentions add up, it does indeed look like a P11/7-3H3 will work.

Thanks, Steve

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Gapped parts often have labelling that refers to the intended AL value of an assembly. If just the material is marked, the part likely has no gap.

RL

:On Tue, 5 May 2009 07:02:25 -0700 (PDT), snipped-for-privacy@gmail.com wrote: : :>On May 5, 5:23 am, Ross Herbert wrote: :>> On Mon, 4 May 2009 09:49:51 -0700 (PDT), snipped-for-privacy@gmail.com wrote: :>>

:>> :We're trying to find a replacement ferrite pot core.  The core is just :>> :like the type shown in this picture: :>> :

:>> Most likely a P11/7 with a zero air gap. If both halves are identical to the one :>> on the right then it will be most likely be ungapped. If gapped, one half should :>> have a threaded insert to take an adjuster slug. :>>

:>> The current Ferroxcube data sheet doesn't include 3B7 material since this is :>> obsolete. In 2003 they recommended 3H3 as its replacement, but as you will see :>> from the data sheet 3H3 is also superseded. You should still be able to get them :>> though. :>>

:>>

:>Thanks for the great replies. Neither side has threads, there was no :>adjuster slug. The dimentions add up, it does indeed look like a :>P11/7-3H3 will work. :>

:>Thanks, :>Steve : :Gapped parts often have labelling that refers to the intended AL value :of an assembly. If just the material is marked, the part likely has no :gap. : :RL

It is very easy to determine gapped cores simply by aligning the two halves and holding them up to the light so you can see through the side slots. The gap in the centre leg of the core is quite noticeable. The P11/7 3B7 cores I have made by Philips pre 1990 have a threaded nickel plated insert in one half to allow for the adjusting slug to vary the final inductance value. The zero gap variety doesn't have the insert.