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Customer Reviews for the MFJ-21.

From: Seth KI7AQJ
A good source of trans oil for my own home-brew dummy loads that don't suck, won't burn out after 10 seconds, and can run at 2000 watts for hours or days. I used a 5 liter steel canister with a gasket sealed lid, not the world's cheapest paint can. The resistors are thick film +/- .05% 50 ohm set in series parallel arrays on heat sinks and submerged in oil, that circulates through an oil cooler, and expansion tank. A thermal cutout kills the power, as does a pressure sensor, should the load get too hot and try to explode. This oil was the final ingredient to a 10KW intermittent dummy load. I'd assume it could possibly run 50KW for 10 seconds, but I am just not that adventurous. The dry version of my dummy load will run 1.5KW for 15 minutes, not 10 seconds. I can't analyze anything in 10 seconds, let alone trouble shoot it, so I made my own dummy load. MFJ packages the oil very well, and so far no messes to clean up. The oil takes off a lot of heat and pumps very well with no foaming, breakdown, or overly objectional odors.



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