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Customer Reviews for the MFJ-250.

From: P.R. Trail KK4UGJ
I purchased this oil cooled dummy load to help with tuning my Ameritron AL-811 Amplifier. It arrived in very good condition. The shipment consisted of a one gallon paint can with a large 50 ohm resistor mounted in a frame in the center of the paint can lid and attached to a SO-259 connector that is attached to the outside center of the lid with 4 mounting screws. A 1 gallon plastic jug containing the transformer oil was shipped in the same box and was double bagged in case of leaks. There were no leaks. Both items were well packaged in the same box.

After filling the paint can with the included transformer oil per the included instructions and carefully sealing the paint can lid to the can I attached the dummy load to the Amplifier using a 7 foot RG-8x jumper and tuned my AL-811 Amp across all bands. The Amp was showing approximately 400 watts in CW Mode and the Dummy Load did not even get warm although The AMP was tuned using only 5 to 7 second pulses to keep from overloading the 811A tubes per the Amplifier's users manual. One word of caution! The lid leaks profusely all around the area where the SO-259 is attached to the center of the lid. It needs to be sealed. I tilted the can somewhat while attaching the jumper to the connector and the oil came out on the lid all around the connector. Also, the little vent tube installed on the lid beside the SO-259 will also leak as the cap over the vent tube does not seal it off. Be sure to keep the can fully upright at all times. Be careful not to knock the can over or handle it in a manor that can slosh the oil inside the can around.

I would purchase this item again. There should be a warning included in the instructions about possible leaks around the SO-259 connector. Other than that, I am well pleased with this product. It performed as stated.



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