[Hallicrafters] SX-117 Audio has too many lows

[Carl]

Correct to:

C-99, 100, 101. Should NOT make any difference but.....

Carl

----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: <hallicrafters at mailman.qth.net>; <kc9cdt at aol.com>
Sent: Monday, April 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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