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if can on model 42-1003 code 121
#4

(01-19-2015, 06:26 PM)mountain man Wrote:  Thanks John, I guess I need  a refresher course in schematic interpretation, never noticed that but at 75, Icon_lol I have a good excuse. going to replace all if can wiring as they are all cracked and some exposed so replacing caps are a must while I'm there.

The first time I took a similar Philco IF apart to replace the rubber wires I thought - where are the 100pf caps?
The resistor was a common carbon comp. but I found the caps are built into the ceramic substrate and are not replaceable themselves. I measured with a LCR meter and indeed there was pf readings where the caps are to be located. I think these caps are supposed to shunt any extraneous RF to ground. The 47K in yours is actually in line with the AVC buss.  Icon_crazy John


Messages In This Thread
RE: if can on model 42-1003 code 121 - by John R - 01-19-2015, 02:55 PM
RE: if can on model 42-1003 code 121 - by John R - 01-20-2015, 01:46 PM



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