[Elecraft] RS-20M vrs RS-35M vrs MFJ-4225

[Donnie Garrett]

Over the past 10+  years I have owned 3 different RS-20M supplies.  None 
of the RS-20's had and RF hash or transformer hum.  I have also owned 3 
different RS-35M supplies during this same period and all the RS-35's 
had core hum that was sometimes radiated through the metal cabinet.  In 
my opinion the RS-20 series is the best between the 2 supplies.  I also 
own a MFJ-4225 but the (FAN) noise in it is very objectionable! With the 
supply sitting on my desk it is only about 5 feet away from my ears and 
I can hear it.  I don't like listing to power supply or rig fan noise.  
FYI: The fan runs all the time in the MFJ-4225.  Actually the fan in the 
MFJ-4225 is really not the culprit, its the fact that the fan it's 
trying to pull air is as well as exhaust air through the very small 
cabinet holes.

                                                                         
                                       Don / WA9TGT