Tim
This is not the answer you are looking for but I'm using the MFJ-4275 and it
also has some fan noise.
I use it to drive an Ameritron ALS-500M amplifier. As you know when the
power supply warms up a little
the fans turn on. I operate mostly at night when it is really quiet and the
fan noise really stands out then.
The computer I use is "overly" cooled with fans so it is quite noisy. Since
the computer and the power
supply are separated by a few feet I can still determine when the fans turn
on. So what I did was simply to move
the power supply on the other side of the computer (floor mounted case) to
use the computer case as a noise
buffer. I no longer here the power supply fans at all. Or perhaps the
noise has just combines, but I can not tell
the difference since I no longer here the fans turn on and off.
In any case hope you find a solution.
Don
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