[SBE] Question about a toroid core --

[Ron Castro]

Mike:

There are quite a few "Mix" numbers floating around in ferrite land!  The best bet is to contact Delta RF who now does support for the old Silicon Valley products.  You can reach them at:

775.DELTA RF (335-8273)

         Ron Castro
 Chief Technical Officer
    Results Radio, LLC
               N6IE
      www.N6IE.com


  ----- Original Message ----- 
  From: Mike Langner 
  To: sbe at sbe.org 
  Sent: Monday, December 08, 2008 8:05 AM
  Subject: [SBE] Question about a toroid core --


  Hello !

  I'm in the midst of repairing a 150 watts Silicon Valley Power Amplifier, a filter-tuned unit that operates in the FM band.

  It has a "toasted" toroid.  The toroid is one inch in diameter, has (or more correctly, had before it was badly overheated) orange paint along one side, and is used as a bifilar-wound choke wired so that it looks to the two FET's like windings of a push-pull autoformer.

  If I remove a good toroidial unit from another amplifier, the amp with the "toasted" toroid works perfectly.

  Question:

  What's the toroid's makeup ?  I'm thinking as I dig into some more research, that it's likely "43" material, but that's just a slightly educated guess.

  The amplifier's manual's documentation provides no information about the coils -- either the air-wound or the toroidial ones.

  May I please ask for suggestions for the toroid's core composition?

  Thanks !

  Mike/

  Mike Langner, CPBE
  Albuquerque, NM


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