[Hallicrafters] SX-88 Question Update

[GARDGORE at aol.com]

I have more info on that cap now. It is a bypass cap on the sensitivity and 
monitor controls that varies the bias for the RF and IF amplifiers. The 
schematic calls for 10 mfd and my receiver has 250 mfd apparently factory 
installed. I am told that it is somewhat non critical and that there is less 
than 50 volts in this circuit but I was concerned about such a wide 
disparity. Since I want to replace it as well I wanted to ask those of you 
experienced in circuit design how the different values (especially the wide 
spread in these two) would perform in this circuit? Did the factory make a 
production line change to the larger value for C-120 for a reason? Was there 
an incentive for them to change to a larger value than that originally 
specified when the manual was printed? What would be their reasoning behind 
this change?

Thanks, Greg

In a message dated 7/8/2002 8:50:34 PM Eastern Daylight Time, 
GARDGORE at aol.com writes:


> I am in the process of recapping an SX-88 and have hit a snag. The schematic 
> 
> calls for C-120 to be 10 mfd @ 150 volts and the cap in my receiver is 250 
> mfd @ 50 volts. All caps are the originals and the lead dress and solder 
> work 
> is all untouched and original. Others have said Hallicrafters often made 
> changes in the specifications after the manuals were printed and many times 
> 
> receivers have surfaced that didn't match the schematic. What would be the 
> effect on the circuits performance with the two different values? I wonder 
> what drove the change? What would you recommend for C-120?
> 
> Thanks in advance,
> Greg Gore; WA1KBQ



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