[Hallicrafters] SX-16 RF gain circuit question

[Rodger]

Mike,

My SX-16 (and SX-17) also have this resistor and it is added in the 
schematic for the similar SX-17 so probably yours is original.  I 
remember this from when I was restoring my SX-16. 

Rodger WQ9E

Mike Everette wrote:
> My SX-16 seems to have a number of differences from the published schematics I've found.  One is in the RF gain control circuit.  Can someone take a look at their receiver and advise whether this is correct?
>
> My receiver has a 100 ohm resistor from the RF gain control wiper, to ground.  The resistor looks original; but the diagram shows the wiper going straight to ground.  There's an 0.002 uf cap caross this resistor.  This cap is a modern, recent replacement.  The schematic doesn't indicate such a cap.
>
> I acquired this receiver "recapped" but several capacitor values were found not to be correct (not to mention a few wiring errors).  If the RF gain control does have a resistor and cap to ground, is 0.002 uf correct?  Is this cap grounded by soldering the cold end to the chassis?  Whoever recapped it grounded the cap to a lug that grounds to the busing on the RF gain control; I doubt this makes much difference -- or is there an obscure reason why it might?
>
> Also, capacitor C-46 in the audio section -- if I remember right without the schematic in front of me, this is the decoupling cap for the B plus side of the AF driver transformer primary -- is this a 1 uf electrolytic, as shown in the parts list, or is it actually 10 uf?  This cap mounts in a clip under the chassis, at the rear near the AF output tubes.  I rather suspect it's a 10 uf, judging by the photo of the pictorial parts layout, because the cap is physically huge; but can someone confirm this?
>
> Thanks and 73
>
> Mike
> WA4DLF
>
>
>       
> ______________________________________________________________
>
>
>