[MRCA] EMCU-116 Power Supply Troubleshooting

[B. Smith]

That's all those good ole germanium power transistors doing their thing.
Sounds normal to me for that age of a power supply, suspect late 1970's 
construction period.

Z




On 7/12/2014 6:28 PM, Alex J Rokowetz via MRCA wrote:
> Gents,
>
> I picked up and EMCU-116 at Dayton this year for very small money.  
> Here's a link to Brooke Clark's page on the unit:
>
> http://www.prc68.com/I/EMCU116.shtml
>
> It powers up and puts out the correct voltage but makes a whining 
> noise when powered on.  The whine does not go away.  I can't imagine 
> this is normal for the unit but wanted to see if one of you had one of 
> these and whether or not your unit makes the same whine.  If this 
> whine is abnormal I (as I suspect it is) what component within the 
> power supply could be making this noise?
>
> I have uploaded two videos of the power supply being turned on and off 
> so you could hear the whining noise.  One video has the cover on and 
> the other video has the cover off.
>
> https://app.box.com/s/blme6vjs26l561dss3kq
>
> I would appreciate any guidance you may have.
>
> Thanks,
>
> Alex
> K2AJR
>
>
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