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Antique Radio Technical Forum
Filter Cap Ground Connection Wilcox Gay 1J10

Posted by Marv Nuce on 03/30/2009 00:43

Bob,
The cap with a wire wound around it is a "gimmick" series resonant circuit. Rumor has it that it was used to trap some Maritime frequency that caused interfrence. I found one in the filament circuit of a Zenith AC/DC set, but docs stated it was tuned near the IF frequency of 455kHz. Go figure!!

marv

:Thanks for the explaination. Now I will see if I can remember that :O) I know I have seen it in a few other
:schematics I have worked on..
: But I am still wondering if in replacing one of the
:"white" ceramic caps...that has a lead wound around it and going to ground is necessary when I replace it. SHould I just wind it around the same amount of times and keep it basically the same? I do not know what that winding does..?
:Bob
:
:::
:::Do the schematic drawings for the negative filter cap ends denote anything different with it's forked like end to the ground symbol?
::
::Bob, that's one of the symbols used for wet electrolytics. The individual values for the lugs are differentiated by the small triangle, square, and part circle symbols. These smaller symbols will be near the lugs as well on the outside with value and voltage. I don't know if that capacitor symbol was ever adopted by EIA but some did use it...yours makes point.
::Bill
::



Filter Cap Ground Connection Wilcox Gay 1J10 
Bob E. 03/28/2009 23:39 
Bob E. Here is the Questions 03/28/2009 23:50 
Peter G. Balazsy 03/29/2009 01:23 
Bob E. 03/29/2009 13:14 
Here "Are" the remaining questions..any  03/29/2009 15:55 
Bill VA 03/29/2009 20:26 
Bill VA 03/29/2009 20:32 
Bob E 03/29/2009 21:59 
Bill VA 03/30/2009 00:33 
Bob E. Hey Bill Follow up :O) 03/30/2009 01:00 
Jon 03/30/2009 06:44 
Bill VA 03/30/2009 11:31 
Bob E 03/30/2009 15:11 
Bob E. 03/30/2009 09:27 
Marv Nuce 03/30/2009 00:43 
Ceramic Caps 03/30/2009 08:55 
Bob E. 03/30/2009 09:11 
Edd 03/30/2009 19:27 
Bill VA 03/30/2009 21:12 
THANKS! Edd and Bill !! 03/30/2009 23:29 

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