Pyramid PS3KX 2.5A / 3A Peak Linear Power Supply

I use it to power a stock Uniden 980ssb cb radio. I dont know which one some people are reviewing or why it mentions a cooling fan in description because this one doesn't have a cooling fan and the operation is quiet. It has a heat sink on the back. It does get kind of warm but not overly hot. I hooked up a pc fan to the power supply and put it right behind the the heat sink and this really cooled down the power supply by a lot it runs much cooler. I did run the power supply for a month without the fan and ran fine i just figured since i had a pc fan laying around that keeping it cooler during operation will extend it's lifetime.

Like title says, only had a few days. However, I'm using it to power a mobile CB in my house for a base station and it is doing the job without a strain. I have used other Pyle products and expect this to be no different in quality and construction, hopefully it last for years to come if I take care of it. Also, on the stars above it says light weigt, generally speaking on something such as this you want it a little beefy as light would translate to junky/cheaply made so I gave it 3 stars vs 5 as it has a little wanted weight there...

Very good transformer. High quality, just what I wanted.

Good solid power supply. I use it to run a GMRS and a CB radios. Both radios operate perfectly with the power supply running both at the same time with no issues. The only issue with the power supply is that mine only puts out 12.4 volts according to my GMRS radio. I was expecting something closer to 13.8 volts, but again both radios run fine at 12.4 volts.

I use this all the time for automotive diagnostics.

This unit is incredible.

fast delivery and was place on back porch so it was out of the weather.

I use mine to power a 2-way radio. It provides steady voltage and current for my needs. A good value for the price.

Easy to use and very stable.

This supply has run all night for several astrophotography sessions. It is reliable and runs cool.

This supply seems to be able to push its rated load but the back mounted heat sink gets too hot to touch between 120-140F as reported by a meat thermometer. There is a thermal cutoff device mounted right next to the main power transistor on the heat sink. Don’t know at what temperature it opens. A little 40mm fan would do wonders and keep things cool. Unit is heavy and seems well built and quality looks good on inside of cabinet. As someone else mentioned in another review, I would like to see a grounded plug for cabinet ground safety instead of thin zip-cord that it comes with for the 120vac primary.

Great power supply for a lower wattage ham radio. Outstanding value.I use it with aHAM-UV20 Mobile Radio 20 Watt dual band radio I have on my workbench in my garage. It provides plenty of power to run that little rig. Excellent value for the price and I highly recommend if you need to run a lower wattage mobile radio in your house. Especially if you’ve got a shack and you might have some larger power supplies tgatvatr doing other things just in case.

As a ham operator, I've been plagued for years with horrid RFI noise from countless "Wall Wart" power supplies running lots of small devices in my radio room - computer monitors, radio accessories, etc. In every single case of tracking down noise, it turned out being one of these cheap switching power supplies.So in the last few months I've been buying these Pyramid / Pyle 12vdc linear power supplies, and rewiring all my low-voltage devices using these supplies as the source. At 6 amps, I have found I can easily run multiple small 12v devices from a single supply. I simply make up cables with inline fuses for safety and terminate according to the needs of the device I'm running.This is a TOTALLY LINEAR ("analog") power supply and doesn't generate ANY noise. It's built using easily sourced replacement parts, clearly marked for part number etc., and the manual comes with a full schematic. Build quality is excellent.I now have 7 of these supplies all over my radio room and 100% of my "wall wart" noise problems are gone.Happy to rate this supply a full 5 stars for being exactly what it's advertised to be, and for doing a great job.

3-star update:I originally rated this product 1-star. The unit I received had been used/defective/damaged/returned/recycled. I ordered a replacement, which appeared to be a new unit. Unlike the original unit, it was functional. (No credit to Amazon, BTW. Their fulfillment center shipped it in a big plastic bag, 4 sizes too large, with no padding. Seriously!) I noticed three things:First, the banana jacks are REALLY TIGHT! Banana connectors are still the way to go, because the connectors are very cheap, and their screw terminals are very "iffy." Furthermore, other reviewers indicate they easily come unscrewed from the chassis.Second, the heat sink on the back does get inexplicably warm. I was powering a radio that drew only 0.7A. It didn't get "hot," but I felt the unit wouldn't be good for much more than a 1-2A continuous load.Third, the power was not as smooth as I would have liked for my radio. I didn't scope it. I suspect the problem is that the chassis ground floats (two prong plug). That said, a wall wart transformer (12VDC, 1A rating) with no ground and an unpolarized plug was much quieter (plugged in with either polarity).I'll be keeping the power supply, but only because I can use it for a different project, and I don't want to go through the hassle of another return.Original 1-star review: Puts out almost no amperage (perhaps a small fraction of an amp) under load before voltage plummets. Will not run a radio that draws less than 1A. Obviously a circuit problem somewhere.As I was packing the thing up for a return, I noticed the heat sink is covered in dust, with a few clean fingerprints on it. This unit obviously sat around for a while somewhere -- not fresh off the assembly line.Otherwise, a nice meaty transformer. Awful output screw terminals, but can use banana plugs. Heat sink fins oriented the wrong direction for effective cooling, but can turn unit on its side. According to the schematic, (-) is grounded to the chassis, but the chassis is not grounded via a 3-prong plug to the outlet (which would be nice).I'll do a return and give this unit another chance, only because the power is reputed to be smooth.

I purchased this on Amazon I don't know how long ago but is a great little power supply. I am an audiophile and I run two high end tripath amplifiers that require about 2A max each at 12V; 13.8 V in this case, putting out about 15 W of audio power each. I also run a Tortuga light dependent resistor preamp off of the same 12 V, requiring maybe about 0.5 A. The sound is excellent, meaning the power is very good and it makes my audio system sound a lot better than with another power supply. I just tried a much heavier rated linear power supply and it made my system sound like crap. So I sent that back and I'm staying with this unit.Home high-end audio is generally not something that people would need 12 V for, but in this case it works very well. I would recommend this for something that isn't going to suck a lot of amps.One thing I don't care about this is that it has a built-in cheap 2 conductor cord. I would much have preferred a standard IEC jack with ground. That's the only reason I don't rate it five stars. I plan on doing a little minor surgery and replacing that cord with an IEC jack, grounding the chassis, and then using my own custom power cord. But that's just me. Highly recommended depending on your usage.

First off, when you get it connected it works perfectly and as intended. Now for the negative parts...It's got a 120v input plug on the back and zero instructions on how you're supposed to go from 220v to 120 other than to change the jumper. I'd guess alot of people that use these need to go from 220v to 120v so that plug does no good. I had to cut it off and put on a 220v plug. Kind of annoying I had basically give up my warranty due to bad design. They should have made and included an adapter to put on the 120v to get to what a 3-wire 220v would be.Reason I got this was because in my water well shed, electricians that wired it up only ran 2 hots and 1 ground out there. There was no neutral wire, if they'd did their job properly, I'd 120v out there without the need for this $100 transformer. But with this transformer I was able to get 2 hots and 1 ground converted to 120v with 1 hot, 1 neutral and 1 ground. After I brought the 220v to a disconnect and then to a 220v outlet, I was able to use it.

I used to use one of those 12v converters from Radio Shack but it finally gave out and it was time to take a step up. I read about this unit, as well as it's smaller and larger amperage brothers and felt this sized unit was the best value for the money.I like the unit. It is clean looking, nicely made and will be a perfect workhorse for my 12v testing work.The "only" thing about it that I do not like is the 12v located in the back. I would have preferred having a reset button instead of a fuse.

I own a Pyramid 25-amp supply that's been fantastic over the years, but it's overkill for the lights on my fish aquarium. I bought this expecting the same quality but I'm very disappointed.First off, I'm drawing less than 4A and the whole enclosure gets too hot to touch. Not surprisingly, at that temperature it emits a very strong burning smell that fills the whole room, and frankly scares me that it's going to set the place on fire. I rigged up a CPU fan from an old PC on top of it, and tried it on the rear where the heat sink is located, but either way it wasn't nearly enough to cool it. Then I tried a larger case fan, and it was cooler on the sides but I still couldn't touch near the back, and it still stank. I can't imagine what would happen if I really loaded it at 6A.I also noticed that the binding posts are very poor quality. First off, when I unscrewed them, the whole post unscrewed from the enclosure and came loose. I had to break the cap free, remove it, re-fasten the base of the post, and put it back together. That happens most times I unscrew it. While I did that I noticed something else: these posts don't have a hole through the side so that you can unscrew, feed a wire through the side hole, and fasten it down. With no hole it can be frustrating trying to get a good contact.As far as the buzzing noise others have reported, I can say that it does buzz but not enough to bother me. What will be louder will be the monster cooling fan that I have to mount on top! This thing's destined for the junk drawer.

Bought this to power my car audio amp in the house for my computer. This power supply powers my old school A/D/S P40 amp (25 watts rms per channel @ 4 ohms). This setup replaces a pcamp that put out the same power. It does give off some heat, so I added a silenx EFX-12-1ST 120mm fan on top of the case to keep it cool. I also added a DC digital LCD voltage panel display to keep an eye on the voltage output. Voltage has been stable @ 13.84-13.86 under load even with increased volume. Seems to be well constucted and is heavy from the power transformer inside. It is a good value and is available with prime for free shipping. I can recommend this at this time.

The PS8KX 6 amp PS was an excellent choice to drive my Pan Tilt Zoom camera. The PS that came with the unit was insufficient to continuous drive the stepping motor in the camera. The PS8KX 6 amp provided continuously on demand power . It generates a little heat as expected but, runs quietly off to the side providing the power needed for this application. I have no complaints about size, weight or heat output. This power supply performs as required.