[Hallicrafters] SX-9

[Carl Nord]

I restored one about 5 years ago. It is a bias battery. I just used a watch battery that was of the same physical diemesions and it worked FB
Carl WA1KPF
 -------------- Original message ----------------------
From: TVComlGuy at aol.com
> 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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