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Peavey KB 300 amp problems

Peavey KB 300 keyboard amp's 15" speaker stopped working. The horn speaker still works. The only fuse I found inside is still good. Any suggestions?

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Hi there.

You have have been unfortunate enough to experience an uncommon failure. The bass driver has failed. It is a Black Widow that can have the basket/cone/voice coil assembly replaced as a complete unit. The magnet unbolts from the basket and you bolt on a new one. Classic field service designed product. You will be able to get a new basket from a Peavey equipment stockist. Just ask for a 15' Black Widow replacement basket They cost about $180 here in Australia and you can easily change it yourself. Good Luck and happy jamming.

A FixYa rating would be great for my tech tip to you. Cheers

regards
Graeme

Posted on Mar 08, 2008

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I WANT TO SPLIT MY PEAVEY KB300 AMP FROM THE SPEAKER SECTION BUT I AM NOW GETTING A DISTORTED SIGNAL MAYE THE WIRING IS WRONG ANY CLUES

Posted on Apr 07, 2010

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Posted on Jan 02, 2017

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What output transistors are used in the peavey XR8600 AMP. IF ANY HAS A PICTURE OF THIS TRANSISTORS PLEASE


That sounds like great idea however without the ability to test and determine that it is actually wrong with them I would put up a big red flag that says stop. With out the proper knowledge, equipment and skills you have a very high percentage of destroying the amplifier. Do you know what configuration the output transistors are in and how to bias them? I do not have the circuit diagram but the outputs operate in Class D, that tells me it most like has MOSFETs instead of transistors in the output circuit.

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CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer servicing to qualified service personnel.

If you are using channels 1-8 be sure the mute button is not pressed. It is to the left of the effects selector. Is the LED illuminated for the DDT Speaker Protection system, if so that is shutting down the outputs.

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Phone output jack connector, this kind of connector acts as a switch that when you have your earpieces connected the speaker is automatically disconnected, and when you unplug your earpiece then the speaker activates, so there's your issue.

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Sounds like you need a new reverb spring set.

Peavey is very good for parts

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Have you tried Peaveys website? Usually you can find manuals there. I think you can print them for free ,but I'm not sure

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Yes a horn can get blown. This should be 2 pieces, the horn itself and a circular driver on the rear. The driver itself will have what is called a diaphragm that can be removed and replaced. That is the part you want. Open up the speaker and get the part number off of the back of the horn and order the diaphragm from Peavey.

Dan

Aug 27, 2008 | Audio Players & Recorders

1 Answer

Peavey xxx stopped working during a show


Hi lespaul 2001

Have you checked your HT fuse. If it fails it will have lights but no sound. Pays to check fuses with a multimeter, as they sometimes look good, but can be dud.

A faulty or intermittent lead speaker box lead will aldo make the head blow fusesCheck the lead to your speaker box also. Dont use a stomp box patch lead. be sure to use a decent speaker lead with quality jacks(switch craft) and at least 16 gauge cable. Ernie Ball make a decent speaker lead for guitar rigs.

If the head keeps blowing fuses, I would suggest that you change you output tubes(4 x 6L6GC). I recommend Electro Harmonix, by Sovtek as a budget conscious option. Get them as a gain matched quartet.

If it does not have a blown fuse at all... then get back to me here and we can do some more tests.


I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Jun 16, 2008 | Audio Players & Recorders

1 Answer

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check your cables,line source inputs, speakers button switches( A&B),maybe it's OFF,if it's ON, then you have a power amp. problem,see a doctor,you know what i mean.

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