Topband: Ferrite Cores

[Bill Wichers]

It sounds like they weren’t properly fired from what he said about them crumbling. That, at least, is an easier thing to look for than a messed up mix. If they have poor QC on these things then I’d be concerned about the “mix #61” not actually being mixed correctly resulting in the cores not having the correct magnetic properties. If I have some time I can put together a test setup for that and check the ones I have coming to be sure.

That post looks to be several years old so hopefully Amidon has corrected the problem, or otherwise switched suppliers.

  -Bill

From: Mike Waters [mailto:mikewate at gmail.com]
Sent: Tuesday, August 05, 2014 3:01 PM
To: Bill Wichers
Cc: topband
Subject: Re: Topband: Ferrite Cores

It's certainly possible.

You can read what he said and see photos at
http://forums.qrz.com/showthread.php?240056-Need-source-for-Cushcraft-R5-torroids&p=1882177#post1882177

73, Mike
www.w0btu.com<http://www.w0btu.com>

On Tue, Aug 5, 2014 at 1:54 PM, Bill Wichers <billw at waveform.net<mailto:billw at waveform.net>> wrote:
Well, I should have them in a few days so I’ll check them out and report back what I find. Maybe Greg just got some from a bad lot?
FT-240-61 cores. Amidon was $9/ea, Mouser (for the Fair Rite equivalent) was $14/ea.

Those were the SAME Amidon cores that Greg, W9GB said were crumbly, cheap Chinese junk and completely unusable. See my previous post.