[Hallicrafters] SX-110A question

[Edward B Richards]

Hi Mark;

I don't find it strange at all. It is quite common. I have seen it many
times. Sometimes they put caps from both sides of the line to chassis.
Since the chassis is supposed to be grounded (by you) this bypasses any
RF coming in on the power line. The resistor is to prevent a large
voltage difference building up between the chassis and the power line. It
bleeds it off. A 470k ohm resistor passes only 1/4 of a milliamp at 120
volts.

73, Ed Richards K6UUZ


On Sun, 23 Jan 2005 11:59:00 -0500 wb8jkr at juno.com writes:
> 
> I have since noticed that the SX-110 schematic on the
> BAMA site shows the .01 uf disc cap (C56) but it does
> not show the 470K resistor (R73). My manual which
> is an original Hallicrafters manual shows the 470K
> resistor across C56 and designates it as R73, and also
> shows R73 in the parts list with a part number.
> 
> Very strange!
> 
> Mark  WB8JKR
> 
> 
> On Sat, 22 Jan 2005 20:48:13 -0500 wb8jkr at juno.com writes:
> > 
> >   I notice in the SX-110 receiver from one
> > leg of the power transformer primary winding
> > there is a 470K ohm resistor bypassed by a
> > .01 ufd disc cap to chassis ground.
> > 
> >  What in the world were they thinking with this?
> > 
> >  
> > Mark  WB8JKR
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