Ferrite Pot Core

Guest
We're trying to find a replacement ferrite pot core. The core is just
like the type shown in this picture:
http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
It measures .439" in diameter, each half measures .130" tall.
Also, it is marked 3B7.

I haven't been able to find any this small.
We only need small quantity, 1-5.
Any ideas?

Thanks,
Steve
 
eletlabs@gmail.com wrote:

We're trying to find a replacement ferrite pot core. The core is just
like the type shown in this picture:
http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
It measures .439" in diameter, each half measures .130" tall.
Also, it is marked 3B7.
Click to expand...
Well..... 3B7 is a grade of ferrite. You'll want the same or compatible.
http://www.ferroxcube.com/prod/assets/sfmatgra_frnt.pdf

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
 
Eeyore wrote:

eletlabs@gmail.com wrote:

We're trying to find a replacement ferrite pot core. The core is just
like the type shown in this picture:
http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
It measures .439" in diameter, each half measures .130" tall.
Also, it is marked 3B7.

Well..... 3B7 is a grade of ferrite. You'll want the same or compatible.
http://www.ferroxcube.com/prod/assets/sfmatgra_frnt.pdf

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

Graham
 
On Mon, 4 May 2009 09:49:51 -0700 (PDT), eletlabs@gmail.com wrote:

:We're trying to find a replacement ferrite pot core. The core is just
:like the type shown in this picture:
:http://www.electronicsurplus.com/objects/catalog/product/image/img70051.jpg
:It measures .439" in diameter, each half measures .130" tall.
:Also, it is marked 3B7.
:
:I haven't been able to find any this small.
:We only need small quantity, 1-5.
:Any ideas?
:
:Thanks,
:Steve

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The current Ferroxcube data sheet doesn't include 3B7 material since this is
obsolete.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.

http://www.ferroxcube.com/prod/assets/p117.pdf
 
On May 5, 5:23 am, Ross Herbert <rherb...@bigpond.net.au> wrote:
On Mon, 4 May 2009 09:49:51 -0700 (PDT), eletl...@gmail.com wrote:

:We're trying to find a replacement ferrite pot core.  The core is just
:like the type shown in this picture:
:http://www.electronicsurplus.com/objects/catalog/product/image/img700...
:It measures .439" in diameter, each half measures .130" tall.
:Also, it is marked 3B7.
:
:I haven't been able to find any this small.
:We only need small quantity, 1-5.
:Any ideas?
:
:Thanks,
:Steve

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.

http://www.ferroxcube.com/prod/assets/p117.pdf
Click to expand...
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
 
On Tue, 5 May 2009 07:02:25 -0700 (PDT), skamego@gmail.com wrote:

On May 5, 5:23 am, Ross Herbert <rherb...@bigpond.net.au> wrote:
On Mon, 4 May 2009 09:49:51 -0700 (PDT), eletl...@gmail.com wrote:

:We're trying to find a replacement ferrite pot core.  The core is just
:like the type shown in this picture:
:http://www.electronicsurplus.com/objects/catalog/product/image/img700...
:It measures .439" in diameter, each half measures .130" tall.
:Also, it is marked 3B7.
:
:I haven't been able to find any this small.
:We only need small quantity, 1-5.
:Any ideas?
:
:Thanks,
:Steve

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.

http://www.ferroxcube.com/prod/assets/p117.pdf

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
Click to expand...
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, 05 May 2009 21:45:25 -0400, legg <legg@nospam.magma.ca> wrote:

:On Tue, 5 May 2009 07:02:25 -0700 (PDT), skamego@gmail.com wrote:
:
:>On May 5, 5:23 am, Ross Herbert <rherb...@bigpond.net.au> wrote:
:>> On Mon, 4 May 2009 09:49:51 -0700 (PDT), eletl...@gmail.com wrote:
:>>
:>> :We're trying to find a replacement ferrite pot core.  The core is just
:>> :like the type shown in this picture:
:>> :http://www.electronicsurplus.com/objects/catalog/product/image/img700...
:>> :It measures .439" in diameter, each half measures .130" tall.
:>> :Also, it is marked 3B7.
:>> :
:>> :I haven't been able to find any this small.
:>> :We only need small quantity, 1-5.
:>> :Any ideas?
:>> :
:>> :Thanks,
:>> :Steve
:>>
:>> 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.
:>>
:>> http://www.ferroxcube.com/prod/assets/p117.pdf
:>
:>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
:eek:f 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.
 
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