Philco bakelite condenser 4989 Z? - Printable Version
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Philco bakelite condenser 4989 Z? - Philcofan - 05-06-2012 08:33 PM
I just started a restoration of a model 60 cathedral and came across a bakelite condenser 4989 Z. According to the schematic I have it is a .18 single but upon removing the wax there are two caps inside. I was on philco repair bench and a Z version is not on there for a 4989. I have 0.22uf caps can I use these and what pin is the double? Just want to be sure.
RE: Philco bakelite condenser 4989 Z? - Ron Ramirez - 05-06-2012 10:34 PM
The 4989-Z has two .09 uF caps in parallel to make .18 uF. You will note there is an external jumper wire between the center terminal and the outermost terminal; the grounded terminal is common to both caps.
Yes, you can use a single 0.22 uF in place of the two, or two single 0.1 uF caps. Close enough for gubmint work, as they say.
RE: Philco bakelite condenser 4989 Z? - Philcofan - 05-06-2012 11:10 PM
Thanks for the information. I do have two 0.1 caps. Good thing I asked I was going to use two 0.22 caps. It was not labeled as a double condenser on the schematic I have. Is this typical? Which pin is the ground pin?
RE: Philco bakelite condenser 4989 Z? - Ron Ramirez - 05-06-2012 11:36 PM
The screw hole is the ground in that particular block.
RE: Philco bakelite condenser 4989 Z? - Philcofan - 05-07-2012 12:14 AM
Thanks for the information.