[Swan] AC hum in the speaker...

Rick Lutzinger [email protected]
Sat, 15 Jun 2002 22:40:47 -0400


Jacob,

Poor, i.e. dirty contacts in the power supply to rig connector will cause 
this hum often.  Clean the contacts with de-oxit before moving on to the 
filter caps.

Rick KD6ZR


At 02:39 PM 6/14/02 -0400, Jacob Tennant wrote:
>I am getting a annoying AC hum in my speaker of my 117XC power supply for my
>Swan 250?  I have been told that this is one or more of the capacitors in
>the power supply leaking?
>
> From the schematics the only ones that appear to possibly be the culprits
>are the big paper covered caps. that are the various 100MF/350WV and
>150MF/150WV ones.
>
>Am I close to being correct or have I missed some other caps that I should
>replace?
>
>Was going to maybe sell this setup on eBay, BUT have decided not to as for
>some reason I just can't let this old rig go... it has kind of grown on me,
>so I am going to fix it up some to make it last for another 30-35 years as
>from the serial number it was made about the same time I was born (mid
>1966).
>
>Jacob Tennant  K8JWT
>
>_______________________________________________
>Swan mailing list
>[email protected]
>http://mailman.qth.net/mailman/listinfo/swan