[Hallicrafters] S-85 Sensitivity Control

[Richard Knoppow]

     I went through several manuals for the S-85 and its nearly 
identical predecessors the S-40, S-40A and S-40B.  The pot is 
mis-identified in one Sams book as a 500K pot rated at 1 watt. I think 
this is meant to be the volume control.  In another book its listed as 
10K, 1/2 watt but the schematic number is wrong. This schematic has 
several items all with the same number. However, I think you would be 
safe with a 1/2 watt pot or, if there is room, a 1 watt wold be better. 
The pot is in the cathodes of three stages, none of which draw much 
current plus when the pot is at minimum resistance it grounds the line 
and at maximum the tubes are running near cut-off so there is very 
little current.
    The differences between the S-85 and S-40B seem to be mostly 
cosmetic.  Hallicrafters sure got a lot of milage out of this basic 
circuit which dates at least as far back as the S-20R.

On 10/3/2015 10:19 AM, rbethman wrote:
> On 10/3/2015 12:06 PM, Mark K3MSB wrote:
>> What is the wattage rating for this 10K pot (R3) ?
>>
>> 73 Mark K3MSB
> Mark,
>
> As that entire manual has done for an unknown reason, not a single 
> variable resistor has a wattage rating.  You might toss out a feeler 
> on Boatanchors.
>
> I bet that there is a Sams or Rider's that has that listed
>
> Regards, Bob - N0DGN
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL