Pyramid Universal Compact Bench Power Supply - 2.5 Amp Linear Regulated Home Lab Benchtop AC-to-DC 12V Converter w/ 13.8 Volt DC 115V AC 50 Watt Power Input, Screw Type Terminals, Cooling Fan PS3KX

Need to bench your car stereo? Want to use your ol' CB indoors? then this guy is for you!I've been using this power supply for a long time now and it has NEVER faltered once.I bought it to power my (HD) car stereo indoors and it has worked perfectly for quite some time now!I have never heard any sine wave noise or static, the power it provides is as clean as soap! This unit has been through storms, power outages and surges and still works like a champ. more than enough power for radios and small dc items. If I have a complaint its that I wish I would have gotten the next model up that comes with a "cigarette' lighter " for quicker hookups. If you have DC power needs, this is a great product for home use!

I have a little AIYIMA tube preamp that uses 6J1 tubes. I kept thinking that the left side tube was going bad. So I kept rolling both tubes. Then I thought the left tubes on my "main" tube tube amp were going bad. Then I thought my rectifier had a bad side. Long story short, it was the wall wart they ship with the AIYIMA (and probably the other brands too). It was just picking up noise from my house wiring, or my router or something. I bought a pigtail that has the 5.1/2.5 that you need to plug into those little 12 volt tube preamps. Then to plug into the power supply, I just use plain old banana plugs. Works great! No more noise, and like other people have noticed - sounds better too. Sound stage is wider, bass better. Not sure if it's because those little tube preamps actually like 13.8 volts more than they like 12 volts. Or if 3 amps is better than 2 amps (like with the stock wall wart). Either way, the money was well spent. Not only is there no more strange noise, and better sound - but at idle, the tube amp preamp is now absolutely silent.

I bought this so that I could repair 12 volt electronic devices such as car stereos, 12 volt pumps, etc. in the comfort of my house rather than trying to fight with wiring harnesses in cars and boats. It works perfectly for this type of use. I like the on/off switch on the front. I can hook everything up, then power it up, ready to quickly turn it off if needed. It does not deliver a great deal of amperage, but to operate the water pump in my boat (for plumbing not cooling the engine) it at least had enough to let me know if was working or not after I repaired it. It certainly has enough power for most electronics. The wires that are supplied with it are good quality with alligator style clips. The terminals accommodate other "banana" style plugs if you have wires with those, or you can just tighten wire to the unit using the screw clamps.

The Pyramid 3-Amp 12-Volt Power Supply (PS3KX) is the least expensive 3A (2.5A) power supply I could find, and what I'm using it for, it works very well. I'm a radio collector and Amateur Radio Operator. I needed another power supply to work on some vinatge CB radios, and low power (10W or less) VHF/UHF equipment. For this purpose, the PS3KX is doing the job. It's small, lightweight, inexpenive, and is putting out the expected voltage. I really can't ask for anything else. If you're planning on using higher wattage transceivers though, this isn't the power supply for you. I would trust it up to 15-20W.

I had two observations:1. The unit had audible hum noise. I'm assuming this was specific to my unit since others have not complained about this.2. The unit has clear impact on the sound quality -- both good and bad (to my ear). Now the experience may be specific to my setup.I used this power supply to run Musical Fidelity Phono Preamp V-LPS. The setup includes VPI (HW-19) turntable (MM), feeding Musical Fidelity V-LPS (running on the power supply, the subject of this review), connecting to a tube integrated amplifier(tried with two -- one 300B Single-ended triode and the other with EL34 Push/Pull configuration).Two clear results to my ears:- Unambiguous improvement in sound-stage (more body also, a bit more 3-dimensional sound)- Equally unambiguous reduction (roll-off) in higher frequency sound compared to wall-wartThe changes were large enough for me (and a couple other people) to notice these immediately.With that, I'm returning the unit (due to noise) and not asking for a replacement unit (for higher frequency roll-off; unacceptable to lose the airiness of the VPI).With that stated, someone with bright-sounding system (possibly some solid-state?) may see favorable results (depending on your taste?) with this power supply. I can imagine reduction in bright/harsh sound and this power supply may make the overall system sound closer to the "tube" sound. But that's only a conjecture. (may be I should try with the SS receiver/s I have and post the findings). Meanwhile, parse this review in case it helps you.All the best.

I received my Bench Power Supply yesterday. I was super excited! I hooked it up and things were working fine. At the end of the day, something didn't seem right, so I used my multi meter and found that the voltage was dropping to .744 and amps to .005, for whatever reason. When the unit decided to start working again, output was 8.60V max and less than 1A. I checked the fuse and the main power supply and things were in working order. I turned the unit back on and had the same results as stated. If you decide to purchase one of these, I hope you receive a unit that actually works.

Good product, good packaging. I tested it right out of the box with my voltmeter and got a constant 13.7 V. It is also well regulated, my meter wasn’t drawing much current. Anyone with enough knowledge to create their own voltage dividers (anyone with google) and who needs a cheap desktop power supply should consider this!