From: "Don and Diana Cunningham" 
Subject: Re: [drakelist] TR7A -- 60 Hz Hum in Headphones


Rob,
Drake put a resistor in series with the "hot" lead on the
headphone.  My old
memory says it was a 100k, 1/4 watt, but think the exact remedy is listed on
the Drakelist Home Page.  It's really that simple!
73,
Don, WB5HAK
----- Original Message -----
From: "Rob" 
To: 
Sent: Friday, July 18, 2003 5:42 PM
Subject: [drakelist] TR7A -- 60 Hz Hum in Headphones


>
> I just acquired a TR7A.  It works great.  Listening to the speaker, the
> receiver sounds great and I have been getting great audio quality reports
on
> my SSB transmissions.
>
> However, I do hear a pretty noticeable 60 Hz hum when I use my headphones.
> (I don't notice the hum in the speaker even when the volume is turned way
> down -- I only hear the hum when I use headphones).
>
> Is this normal for a TR7A?  If not, where should I look to track down the
> problem?  The power supply?  A blocking cap in the audio section?
>
> I could always use an external 60 Hz hum audio filter but I would prefer
to
> find the source of the problem.
>
> 73's
> Rob
>
>
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