Pyramid PS9KX 5A / 7A Peak Linear Power Supply w/ Lighter Port

Bought this in 2018. I may have reviewed it right away. So this is an "After Six Years Of Use" review. I wanted to mount it in an ammo can, so I moved the fuse to the front, and moved the rectifier and heat sink to the side of the unit. Then I mounted it in an ammo can. I had to file off the top of the fuse holder and remove some plastic from the + and - connectors on the front panel; I had to do that in order to close the lid of the ammo can. I added various cords and connectors for a wide variety of applications. I paired it with a VHF/UHF radio in another ammo can (with a battery pack) for a great disaster prep radio combination! I've been using this setup as a VHF/UHF base station on top of my HF radio cabinet for 6 years. No complaints, no issues. It's been a fantastic little power supply, and I've even used it to power my Yaesu FT-817 HF transceiver on many occasions. Two Thumbs Up!

I needed a linear 13.8 volts power supply for my ham radio. I bought this one because the specifications say it has an internal fan. It does not have a fan, which is a major disappointment. The output regulator transistors and heat sink get very hot.I mounted an 80mm x 25mm 59CFM 12V fan on the heat sink. Now the output transistors and heat sink remain at about 150°F/65°C and 130°F/54°C at an ambient temperature of 75°F / 24°C when the power supply is providing 5 amps continuously.

This is a review of the Pyramid PS9KX 12V, 5amp Power Supply. Made in China but built like a tank (the housing is made of steel as you might expect. It has a 12V Cigarette lighter receptacle plus a set of screw terminal (+/-) connectors. I use it mainly to program settings for dashcams b/c I hate having to dismount them or break my neck to view them on windshields - usually in either very hot or cold vehicles at that. It's really nice to do that programming while sitting on my living room sofa or at my workbench. Of course, you can use this unit to charge/run any 12V devices, with the proper connector. The receptacle and screw terminals have an advertised output of 13.8V (I verified my output at 13.78V on both - close enough). The power cord on my unit is 51 inches long and is the only shortcoming (no pun intended) of the unit - I'd like to have had an 8 foot cord; otherwise, I rate this power supply as a definite BUY.The manufacturer boasts that this power supply has: 1) over temperature protection, 2) short circuit protection, and is 3) fused. It runs on 115V AC 60Hz and draws 70W. It’s rated at 5A constant, 7A surge. It has a nice heat sink on the back side which appears to be aluminum. It has beefy, rubber feet to hold it steady. My unit weighed 4lbs. 3oz (1.9kg), excluding the power cord.

Great product I Love it

Love this little power supply for workbench troubleshooting. 👍

Looks nicely made, can't speak to longevity. But it's dead quiet, don't even know it's on aside from distinctive, but unobtrusive, pilot light. 13.8 volts on the money. Just make sure to use it within it's 5A limitation.

What’s there to say ! Great product works great made to last well worth every $!! Highly recommend!

I have my small ham radio connected to the Pyramid PS9KX, and have it on all day long. It works great for my needs at this time. It puts out a consistent 13.8 volts all day long. I like having the option to use the DC plug or direct wire connection.

Needed for mobile cb which is dc current and wanted to use in workshop. Instead of using old 12v car battery bought this. Did the job, JUST ENOUGH power for 1 unit..if you need more than 5amp, go bigger model. Just had no use for lighter plug

If you're a guy of a certain age, you want your base electronics to be heavy and this one certainly qualifies! I have no way to test the accuracy of its output, but it only runs a CB radio so it has more than I need. Much of the weight comes from the heat sink no doubt, but it runs silent. My only complaint is the power connectors don't have a hole to thread the wire through so you have to wrap around the pole and tighten. A knocked a star off for that as it should be expected for the price.

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Great to safely test my MOTOROLA DYNATACS from the 1980’s and early 1990’s. Selling on Ebay as Claimitamerica- this power supply has helped me awaken over 30 year old early cell phones and become #1 in GOOGLE search. This is a solid/ well built unit. The pictured phone is DYNATAC 8000M from 1992 with only 792 minutes of use and looks like new. Since the batteries are over 30 years old, can’t compare to running off this power supply. It also has a great car socket to use with any 12V negative ground device and great with this PHONES slide on car adapter. Worth the price for this niche DIY product.

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I like this power supply for my application but ya need to know it will not do 10 amps continues it is Rated @ 70% Continues amp draw or 7 amps . It will do 10 amps but the protection kicks on shortly after. Ya also need to know it gets HOT THE CASE GETS TO 135F & the heat sink gets to 180F-degree so clear around the unit. Remove flammable materials or add a fan as I did keeping the unit @ 90f degrees & prolonging the power supply life.I like this unit more testing to come.

I am using this unit to provide 12 volt power to a vintage travel trailer I am restoring. Much more cost effective than buying a battery and on board charger at this point. It provides all the power I need for exterior and interior LED lights, vent fans and appliance controls. Power is smooth, lights steady with no pulsing. Quiet and powerful. Good economical solution for interim 12 volt power.

This was a replacement for another supply I use to power my Lipo battery charger for my RC airplanes. Seems to works fine, the only issue I see is there is no fan for cooling. The heatsink for the power transistors is on the back of the chassis, and it gets really hot, very fast. I added an external 12v cooling fan. After about an hour of use it will over heat and shut down even with the added external fan. Pretty sure I am only running at 50% capacity. I have another supply that is pretty much twice this size and its only rated at 10amps. I think this unit is over rated by their specs, as it over heats and faults out for me sorta quick when loaded hard.

This power supply works well, reasonably clean without excessive ripple or noise at rated output. Would rate five stars except that the case is constructed of relatively thin metal which allows the front panel to push backward when inserting an automotive power plug into the front receptacle. Easily resolved through the addition of a small self-tapping screw through the top panel just behind the front panel to help provide support to hold it in place and reduce the possibility of internal components touching in use.

Like many others have already mentioned in their reviews, there is not a fan in this unit like the Amazon description claims. It works just fine without it, but I'm removing a star purely for the deceptive advertising. Heads-up, this thing is HEAVY so be careful leaving it on the floor, my pinky toe still hasn't forgiven me. It's great having this and being able to test 12-volt devices from inside my house! I do a lot of work on car electronics, so being able to test things inside before going outside to install them is great. Also, having prongs AND a plug is perfect. This does everything I was hoping it would.

Got this about a week ago, enjoying it so far! The quality is more than I expected for 80 bucks, considering that the upper level ham power supplies are 100-200 usually. I dont have a multimeter to test it right now, but my radio turns on and works fine when Im using it, I only have a few complaints. #1 is that this thing is HEAVY, if you're using this in a portable rig, you may want to find a different solution, its about 9-10 pounds I think. The other is a minor thing, but still something to consider based on how you set it up, This psu gets TOASTY. I would not suggest putting a radio on top of this like I have pictured due to this reason, but If you have them separated or apart from eachother it will be fine. If this fails in the future ill update my review - so far so good!73s Pyramid, thanks for making a nice psu.

First, let me state that I designed power supplies many years ago. So I know something about power supply specifications and testing. The documentation with the power supply states the following specifications:output 13.8 V +/- 0.3 V, ripply 150 mV rms (424 mV p-p) at 5 amps continuous, regulation 2.5%I purchased this power supply to provide 13.8 V at up to about 3 amp. I use this for low power amateur radio equipment. So I needed the low noise of a linear power supply, but usually don't need more than 1 to 2 amps. As a 3 amp power supply, this performs very well. Output voltage varied from 13.75 V at no load to 13.65 V at 3 amps, and the ripple (noise) never exceeded 20 mV p-p. Above 3 amps, the output begins to drop and ripple increases rapidly. At 4 amps, the output was 11.8 V and ripple 500 mV p-p. I did not test the power supply above 4 amps, nor did I test the over-load and over-temp protection.If you're looking for a true 5 amp power supply, you may want to look for something else. Pyramid makes a 12 amp linear power supply, which may be a better choice for those users.

I bought this power supply from Amazon primarily to power my small thermoelectric travel cooler when my family stays at motels where there is no refrigerator in the room. I chose the Pyramid power supply because I was sure that it was better made than the brick-type AC adapters made by Koolatron, Wagan, and others. I didn't read the reviews carefully; otherwise I probably would have opted for the 10amp Pyramid power supply that also has a cigarette lighter adapter.When I connected the power supply to my cooler everything was fine for 20 minutes or so. Then, the cooler stopped operating. At this point the power supply was hotter than I felt desirable, and the internal thermal shutdown must have been triggered. The output voltage still measured 13.5 volts or so, but it clearly wasn't producing enough current to power the cooler.I contemplated shipping the unit back, but then I decided to try the 4" small fan ($6.00 or so at Walmart) that I normally have blowing over and around my Western Digital external hard drives. This did the trick. The power supply, including the heat sink and power transistor now remain quite cool, and the travel cooler operates indefinitely. Although it is a mild inconvenience to pack this small fan around with me, I believe that it would be a good idea even if the power supply did not overheat. I am sure that the lifetime of the power supply will be greatly extended.

I've been using this power supply since Dec 2008 & it's worked so well I forgot about it. Lately the cigarette lighter plug has been used to charge a GPS & power a mp3 player.The original reason I ordered it was to power an automatic (water sensing) marine bilge pump. There is a low spot next to the garage door & when it rains hard enough water collects & the garage floods. I made a small drain sump & powered an automatic marine bilge pump with a 12v battery charger which worked manually, but never automatically turned-on the bilge pump. I decided to try a "reasonable" power suppy thinking the bilge pump needed a cleaner (less spikes) 12vdc. Normally a marine bilge pump is connected to a 12v battery & decided to substitute the battery with a power supply, it worked perfectly. During extended rain storms the power suppy has been left on for 4 days, the bilge pump (every few mins tests for water) when present the pump turns-on & empties the sump & automatically turns-off & goes back to test mode. I also order the Rule auto bilge pumps from Amazon. When something works so well you kind-of forget about it!