Pyramid PS21KX 20 Amp Power Supply

• Perfect for Home, Shop and Hobbyist
• Input: 115V AC, 60Hz, 450 Watts
• Output: 13.8V DC
• 18 AMP Constant/20 AMP Surge
• Powers Cellular Phones,12V DC CB Radios, Scanners, HAM Radios, Autosound Systems, etc.

I bought this unit around 2 years ago, and it is still working just fine. It seems to be built well, and the ammeter on the front doesn't show any signs of the unit struggling to power my 55 watt amateur radio on either 2 meter or 70cm frequency bands. I would recommend this over the more expensive choices out there.

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I received this as a gift a couple years ago, and it's going strong. I use it as a 12v source for special chargers that I use to charge the various types of batteries used in Radio Control airplanes and cars. I've used it in the sweltering heat of my garage in Central California, and in the cold of my garage in a much colder climate. I even dropped it once, and it's working great!

If I were to say there is a downside, it's that there's only one output pair. I rigged up a multiple output attachment that works fine for my needs. Two pairs of heavy duty binding posts and a project box from an electronic store plus some heavy wire and a couple banana plugs.

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My Pyramid PS21KX 20 Amp Power Supply works great and provides a smooth flow of power all the way up to it's design limit... The unit is constructed extremely solid with obvious quality built into the design.

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I am using this to power an aircraft instrument panel that I am building. It will eventually be installed into an airplane with great difficulty, so I want to get it right on the bench. And I need 20A of 12-14V.

This product fit the bill just fine.

I ordered on Sunday for two day delivery and expected it on Wednesday. It arrived Tuesday.

There isn't much to say about a power supply it is powerful, the ripple specs put it closer to a battery than an alternator powered aircraft or auto. (That's a good thing).

The only gripe is that the built in ammeter is a little on the cheap side. Digital would be great, but I didn't pay for digital. The needle is about 1/2 amp lower than the actual draw, as verified by a precision Fluke multimeter. I can live with that.

I have some great bench power supplies that cost several hundred dollars and have better features, but only put out 1/3 the power. So, all in all, this was a good fit for my application.

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The Pyramid PS21kx is an excellent power supply. My wife is a HAM radio operator and I purchased the power supply so we could use her new Yeasu mobile 2 meter as a base station, and in this capacity, the Pyramid works very well. It's an extremely solid, hefty piece of equipment, and obviously very well consturcted. Haven't done any actual testing of the supply because I don't have the test equipment necessary, except to check the output voltage, which is spot on. I can tell you how it works in operation, though, and it has been flawless. Quiet, no noticiable humming noise as one often gets with less well made supplies. It handles the radio very well, even when she cranks the output power up to 75 watts. I'd certainly recommend it to anyone who needs a fairly heavy duty, 12 volt power supply. HAM radio operaters who often need 12 volt power to operate mobile radios ought to serious look at this unit. Very wel made.