Question about Pyramid (PS36KX) 600-Watt Power Supply

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Pyramid ps 36kx alarm goes off as soon as I turn power supply on with nothing hooked up to it. If I turn it back off for 3 seconeds and back on the alarm stops and power supply will work ok for hours

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Posted on Jan 02, 2017

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SOURCE: Re: Pyramid PS-36kx power supply buzzer sounded,red light came on

Hi! I saw your question, and maybe this will help. I also have a Texas Star 100w amp, and this same power supply. Even though the nominal draw for your equipment is way below the rated amp flow of the power supply, when you key up, and the output on the amp is at max, you are drawing the limit of your power supply! Try running this setup at a lower linear output. You don't need the full 100 watts to get out! 60-80 watts is aplenty! You should start at a low output, and slowly increase the output(while keyed up), untill the power supply starts to complain.(buzzer/light). This is what your limit will be. The only other cure, is a MUCH bigger power supply. Unfortunately, I cannot afford a 60-90 amp supply, so this is what I am forced to do to use the one we have. Also,keep your cb's output very low when using the linear amp. These amps are supposed to get a low signal from your radio, or the linear amp is overdriven. (noisy and unstable. Hope this helps you! 73's to you! jimsjinx

Posted on Dec 03, 2011

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1 Answer

Model 36kx. How do I get it to stop blinking and buzzing with nothing hooked to it?


You probably have a switching power supply which requires a load connected to it before it is turned on.

Jul 28, 2015 | Pyramid Computers & Internet

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Check all transistors that are atached to
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Jul 25, 2009 | Pyramid (PS36KX) 600-Watt Power Supply

1 Answer

Re: Pyramid PS-36kx power supply buzzer sounded,red light came on


Hi! I saw your question, and maybe this will help. I also have a Texas Star 100w amp, and this same power supply. Even though the nominal draw for your equipment is way below the rated amp flow of the power supply, when you key up, and the output on the amp is at max, you are drawing the limit of your power supply! Try running this setup at a lower linear output. You don't need the full 100 watts to get out! 60-80 watts is aplenty! You should start at a low output, and slowly increase the output(while keyed up), untill the power supply starts to complain.(buzzer/light). This is what your limit will be. The only other cure, is a MUCH bigger power supply. Unfortunately, I cannot afford a 60-90 amp supply, so this is what I am forced to do to use the one we have. Also,keep your cb's output very low when using the linear amp. These amps are supposed to get a low signal from your radio, or the linear amp is overdriven. (noisy and unstable. Hope this helps you! 73's to you! jimsjinx

Apr 30, 2009 | Pyramid (PS36KX) 600-Watt Power Supply

1 Answer

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Generally, the fuse only blows when the rectifiers fail. In other Pyramid supplies, they use a square, 4 terminal bridge rectifier. They probably use the same thing in your supply.

Let me know if you have any other questions.

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Use specified power supply by the computer.

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Most of Pyramid's supplies are based on the LM723 voltage regulator. The DATASHEET should tell you most of what you'll need to know to repair it. THIS is the schematic diagram.

If the output voltage drives the voltmeter to the end of the scale, it likely has one or more shorted power transistors.

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