[Elecraft] MFJ-4125 Fan Noise

[Dave Martin]

....
> Have you substituted a quieter fan? Have you installed a series resistor to slow
> down the fan, and with what result? Have you installed a thermostatic switch to
> run the fan only when needed? Or have you given up and simply bought a
> quieter power supply?
>
> Any advice would be appreciated.
>
> 73,
> John, no8v
>
I was annoyed by the noise too, and quit using it.  There's a great
difference in fans.  You might find a quieter one.  A resistor might
be enough to help, though.  Two things I noticed on mine are that the
heatsink is not at ground potential so be careful, and there is a
snubbing resistor which will overheat if there's no continuous air
flow.  So mine sits idle on the shelf.

Dave  W5DHM