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


Rob,
I shouldn't rely on this old memory.  Resistor in my phones turns out to be
100 ohms, NOT 100k.  Sorry for the brain malfunction!!
73,
Don
----- Original Message -----
From: "Rob" 
To: ; 
Sent: Saturday, July 19, 2003 12:40 PM
Subject: Re: [drakelist] TR7A -- 60 Hz Hum in Headphones


> Don,
>
> Many thanks for the reply.  I am really happy that this hum is not a big
> problem at all!  I will install a 100 k resisitor on the hot lead of the
> headphones and pray it works.  I am sure it will!
>
> 73's
> Rob
>
> >From: "Don and Diana Cunningham"
> >To: "Rob" ,
> >Subject: Re: [drakelist] TR7A -- 60 Hz Hum in Headphones
> >Date: Fri, 18 Jul 2003 19:12:23 -0500
> >
> >
> >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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