[Hallicrafters] SX-88 part location?

[lrlayton at cox.net]

Roger,

Earlier this year, I  replaced the  RF gain control on my SX-88 (since sold) with a 10K reverse log taper pot sourced from Digi-Key. I couldn't locate a pot with a long shaft anywhere so I used an extension to the front panel. The part number for the pot was KB1031S28-ND and should be still available.  Did you mean R-84 which is the 330K resistor in the schematic, not R83? I believe my radio had a different value (15K?) and it was located near the far right of the main terminal strip below the IF section. It is shown on the photo in the manual next to R8 and not connected like the schematic shows. The schematic seems to be in error or else some changes were made in later production (my radio was a RUN 2). I might still have some notes on this somewhere.

Les Layton



 
---- Roger Shultz <nj2r at verizon.net> wrote: 
> I'm working on a SX-88 that has a defective RF gain control. Someone
> previously "modified" the pot toasting it and in the process removed R-83, a
> 330K 1/2 watt resistor. The picture in the instruction manual does not show
> where this was mounted nor can I find where the ground end may have been
> connected.
> 
> I can of course provide a ground point but it would be nice to know where it
> was originally connected.
> 
> A second question is that the instruction manual parts list does not specify
> if the RF gain pot is a linear or audio taper pot. It doesn't specify for
> any pot including the volume control what taper if any is intended.
> 
> Thanks for any advice.
> 
> 73, Roger, NJ2R
> 
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