[SBE] Question about a toroid core --

Mike Langner mlangner at swcp.com
Mon Dec 8 13:24:56 EST 2008

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Well do - thanks !

Mike/
______________

Ron Castro <ronc at sonic.net> said:

> This is a multi-part message in MIME format.

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> 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 -----=20

> From: Mike Langner=20

> To: sbe at sbe.org=20

> 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

>

>

> -------------------------------------------------------------------------=

> -----

>

>

> _______________________________________________

> The SBE Roundtable, SBE at sbe.org

> To unsubscribe, go to http://seven.pairlist.net/mailman/options/sbe

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> <META http-equiv=3DContent-Type content=3D"text/html; =

> charset=3Diso-8859-1">

> <META content=3D"MSHTML 6.00.6001.18148" name=3DGENERATOR>

> <STYLE></STYLE>

> </HEAD>

> <BODY bgColor=3D#ffffff>

> <DIV><FONT face=3DArial size=3D2>Mike:</FONT></DIV>

> <DIV><FONT face=3DArial size=3D2></FONT> </DIV>

> <DIV><FONT face=3DArial size=3D2>There are quite a few "Mix" numbers =

> floating around=20

> in ferrite land!  The best bet is to contact Delta RF who now does =

> support=20

> for the old Silicon Valley products.  You can reach them =

> at:</FONT></DIV>

> <DIV><FONT face=3DArial size=3D2></FONT> </DIV>

> <DIV><FONT face=3DArial size=3D2><STRONG>775.DELTA RF=20

> (335-8273)</STRONG></FONT></DIV>

> <DIV><STRONG><FONT face=3DArial size=3D2></FONT></STRONG> </DIV>

> <DIV>         Ron =

> Castro<BR> Chief=20

> Technical Officer<BR>    Results Radio,=20

> LLC<BR>           =

>    =20

> N6IE<BR>      <A=20

> href=3D"http://www.N6IE.com">www.N6IE.com</A></DIV>

> <DIV> </DIV>

> <DIV> </DIV>

> <BLOCKQUOTE=20

> style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =

> BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">

> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>

> <DIV=20

> style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =

> black"><B>From:</B>=20

> <A title=3Dmlangner at swcp.com href=3D"mailto:mlangner at swcp.com">Mike =

> Langner</A>=20

> </DIV>

> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dsbe at sbe.org=20

> href=3D"mailto:sbe at sbe.org">sbe at sbe.org</A> </DIV>

> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, December 08, 2008 =

> 8:05=20

> AM</DIV>

> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [SBE] Question about a =

> toroid=20

> core --</DIV>

> <DIV><BR></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>Hello =

> !</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>I'm in the midst =

> of repairing=20

> a 150 watts Silicon Valley Power Amplifier, a filter-tuned unit that =

> operates=20

> in the FM band.</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>It has a =

> "toasted"=20

> toroid.  The toroid is one inch in diameter, has (or more =

> correctly, had=20

> before it was badly overheated) orange paint along one side, and is =

> used as a=20

> bifilar-wound choke wired so that it looks to the two FET's like =

> windings of a=20

> push-pull autoformer.</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>If I remove a =

> good toroidial=20

> unit from another amplifier, the amp with the "toasted" toroid works=20

> perfectly.</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4>Question:</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>What's the =

> toroid's makeup=20

> ?  I'm thinking as I dig into some more research, that it's =

> likely "43"=20

> material, but that's just a slightly educated =

> guess.</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>The amplifier's=20

> manual's documentation provides no information about the coils -- =

> either=20

> the air-wound or the toroidial ones.</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>May I please ask =

> for=20

> suggestions for the toroid's core composition?</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>Thanks =

> !</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4>Mike/</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT =

> size=3D4></FONT></SPAN> </DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>Mike Langner,=20

> CPBE</FONT></SPAN></DIV>

> <DIV><SPAN class=3D796155715-08122008><FONT size=3D4>Albuquerque,=20

> NM</FONT></SPAN></DIV>

> <P>

> <HR>

>

> <P></P>_______________________________________________<BR>The SBE =

> Roundtable,=20

> SBE at sbe.org<BR>To unsubscribe, go to=20

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