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How to fix pyramid car amp model pb446 have no output sound

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Is my Pyramid 300 watt mosfet pb 772 compatible with a 10" kicker comp sub?


If the output impedance of your Pyramid amp is approximately the same as the input impedance of your Kicker, it should work.

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How do I hook up the two stereo output RCA wires ( 1 L & 1R ) to the EQ input wires that are green/green&white & grey/grey&white?


you will only be able to control 1 pair of speakers, you can try an inline converter. always buy a stereo with 3 preouts especially if you plan on using equalizers/amps ect

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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

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035132ed-916f-4d02-8e5e-9fa428212a36.jpgPyramid stereo graphic equalizer model 9700g - Page 6

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1 Answer

Amp over heating and cutting off


sounds like the Impedance of the speakers does not match that of the amp, therefore the output stage of the amp is trying to compensate, driving the amps too hard and eventually causing the thermal cut out to activate. Check the ratings on everything are compatible before you start sending it off to be fixed.

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1 Answer

PS36K power supply overload problem


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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1 Answer

Pyramid PB681X


You didn't say how long it ran before it quite and I assume the red light you are refering to is the protection circuit engaged light and not the power on light. But from the info you did provide, I'd say that it sounds like you may have blown some of the main output transistors/MOSFET's. If so, it's time for a trip to the repair shop. Sorry, for the bad news. If just turning your car on caused the outputs to fry, then I wouldn't be surprised to find that you have either bridged the speakers wrong or by some means you have put the wrong speaker load on the outputs. Ask someone who knows what they are doing, if you have your speaker loading correct. This person might not be a car stereo installer as sometimes they don't know how to load an amp correctly, especilly when it comes to bridging. Good luck.

Dec 30, 2006 | Pyramid PB681X Car Audio Amplifier

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