[Hallicrafters] SX-9

[Edward B Richards]

Sounds like a bias battery. Negative pole to grid.

Ed K6UUZ
 
On Fri, 23 Feb 2007 21:46:41 EST TVComlGuy at aol.com writes:
> Good evening to the group,
> 
> I was working on an SX-9 today and  I encountered something I 
> haven't seen 
> before.  Between the volume control  and the grid of the 1st audio 
> tube there is 
> a cup shaped device with a spring  metal contact.  It is shown on 
> the 
> schematic I got from Riders.  It  almost  looks like the type of cup 
> that holds a 
> galena crystal in the old  crystal sets.  Can anyone tell me what 
> this  is?
> 
> Thanks,
> Ron
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