[Drake] AC Hum in TR-4C speaker

[Dick KF4NS]

Tony,
I had a similar problem on mine and found that a "ground" with a huge 
glob of solder on it was not even atttached to the chassis, just 
looked like it.
Good luck and73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!



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Message: 1
Date: Sun, 02 Jan 2011 17:14:30 -0600
From: Tony Sokol <tonysokol at sbcglobal.net>
Subject: Re: [Drake] AC Hum in TR-4C speaker`
To: William Houghton <rdrbill at pacbell.net>, "Drake Listserver \(
 QTH.NET \)" <drake at mailman.qth.net>
Message-ID: <4D2106D6.9080602 at sbcglobal.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi Gang,]

     Thanks for all the reply's.  I think Bill has got me going in the
right direction on this one.  Using highly technical methodology,  I
smacked it on the top once and the hum has all but disappeared.  That
says "Mechanical" so I think there is a ground lug somewhere not doing
it's job after 40 years or so.  I did try the plug but it did not 
effect
the hum so it is most likely a floating lug.
     That ACR-4 kit is really a nice way to go.  For those that 
haven't
installed one yet I highly recommend it.  I had a ball yesterday
afternoon and into the evening being reminded of the many Heathkit 
rigs
and accessories that I have built over the years. Have a great 2011!

73
Tony - W9JXN