[TenTec] [] Running a Century 21 on external 12V power

[Jeff (W4DD)]

You might want to try and find where the hum is entering the system.  I
have done this before by using a 1uf cap to ground and touching the cap to
the input of each stage.  Remember to discharge the cap between each stage.

Jeff

On Jun 3, 2017 8:32 PM, "Josh Gibbs" <gibbsjj at gmail.com> wrote:

> My shielding attempts made no difference. I also unbolted the transformer
> so I could move it around slightly (as much as the leads would allow). That
> had no effect.
>
> I think my next step will be to remove the transformer + power board from
> the chassis and run it on the bench. That should stop the noise if its
> magnetic. Might replace the bridge rectifier while I have the power board
> out.... its a $2 part (VJ048 - NTE53000 equivalent).
>
> -Josh WA7FPV
>
> On Sat, Jun 3, 2017 at 2:53 PM, Gary F <dukeshifi at comcast.net> wrote:
>
> > If those are cracked, I guess I wold replace them.
> >
> > They likely will not fix the hum but should not be left if cracked.
> >
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