[Hallicrafters] SX-117 Audio has too many lows

[kc9cdt at aol.com]

CArl,
Thanks, I will try that when I get back home from work,
73,
Lee



-----Original Message-----
From: Carl <km1h at jeremy.mv.com>
To: hallicrafters <hallicrafters at mailman.qth.net>; kc9cdt 
<kc9cdt at aol.com>
Sent: Mon, Apr 18, 2011 1:41 pm
Subject: Re: [Hallicrafters] SX-117 Audio has too many lows


I dont remember the earlier thread but after looking at the schematic 
I'd
suggest a little experimenting.

Lift one end of the following and see what happens.

C-93, the reactance is very high at audio but these micas can be leaky

C-99, 100, 101. Should make any difference but.....

C-97, its to prevent HV spikes but see what it does with a relatively 
low
audio level

And C-98, reduce to between 4.7 and 10uF, that will filter some of the 
lows.

C-94 and 95 are already very low values which reduces the lows, see 
what
happens when you go to half that.

You cant do anything about the IF bandwidth but you can possibly tilt 
the
audio bandpass a little in your favor.

Carl
KM1H


----- Original Message -----
From: <kc9cdt at aol.com>
To: <hallicrafters at mailman.qth.net>
Sent: Sunday, April 17, 2011 10:01 PM
Subject: [Hallicrafters] SX-117 Audio has too many lows


> Hi everyone,
> I have a beautiful SX-117 that hears super!
> The audio however seems to have way too much lows in it and no highs.
> Kind of muddy sounding.
> I tried two different HAllicrafters speakers that are in the
> PS150-120....same sounds.
> It is much better with the Halli R-47, small desk speaker
>
> I plan to look at this tommorrow to start checking to see what's going
> on...
> Any ideas of what could cause this?
>
> Thanks & 73,
> Lee, KC9CDT
>
>
>
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