Pics of Moog 914 Fixed Filter Bank

v-un-v · Posted: Sat Dec 16, 2006 5:29 am Post subject:

I thought the core was a ferrite ring?

Wax-coated paper??

Uncle Krunkus · Posted: Sat Dec 16, 2006 5:36 am Post subject:

Yeah, they wrap them up in wax paper at the end.
Makes them look like baby cheeses.
Kind of fitting for this time of year hey? Laughing

blue hell · Posted: Sat Dec 16, 2006 6:04 am Post subject:

Uncle Krunkus · Posted: Sat Dec 16, 2006 6:17 am Post subject:

Thanks Jan,
I still don't completely understand how it does what it's doing though.

blue hell · Posted: Sat Dec 16, 2006 7:10 am Post subject:

Maybe this will help - I can't see the pictures though as it requires quicktime and I've decided to deinstall that some days ago.

It doesn't seem to use the exact same principle - using some C shaped temporary wire storage thingy instead of a spool.

CZ Rider · Joined: Dec 14, 2006 Posts: 17 Location: Southeastern,PA

Hey, great info on these. Those new winders make mine look like
something from the 50's. Smile

On the old Moog winders, the ring is
a two part precision machined stainless piece. Looks solid when
put together. This is assembled through the donut (ferrite core).
I think, (I haven't tried this yet) you would then load this stainless
ring with the wire. On the outside of the ring is a tab that the wire
slides off then down to a small stationary hub in the center that
the wire guides around. As the ring spins the wire follows around
via the tab on the ring and center hub to make the loops on the
donut. On my old ones the donut is clamped in a vice that rotates
180 deg., then you have to stop and re-clamp for the other half.
Simple, right? Then you would strip and solder on heavier leads,
secure them and dip the assembly in hot wax. Done! Did I
mention there are about 5 different tensioners along the wire path
and all kinds of speeds for the winder and segment control. The
counters on these are vaccume tubes with segments in a circle to
indicate the number of turns. But I couldn't pass these up. The
seller said they would be trashed if someone did not pick them up.
A piece of Moog/Thomas history.

So If I actually get good at winding these, I still need to measure
the permeability of the cores to figure the amount of winds to get
the correct value for the 914. So, did anyone find a source for the
permeability meter or or a permeameter? Smile

bachus · Posted: Sat Dec 16, 2006 8:59 am Post subject:

Yea, thanks Jan, I've always wondered how that was done Cool

jamos · Posted: Sat Dec 16, 2006 10:12 am Post subject:

All of this makes me wonder...

is it no longer possible to buy inductors (the proper name for coils) off the shelf?

bachus · Posted: Sat Dec 16, 2006 10:15 am Post subject:

Try Allied:

http://www.alliedelec.com/Catalog/Indices/Products.asp?sid=458337003C06E17F&N=4294966067

3phase · Posted: Sat Dec 16, 2006 2:46 pm Post subject:

this work for machines...

3phase · Posted: Sat Dec 16, 2006 2:56 pm Post subject: