Question about Peavey Audio Players & Recorders

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Have a VK100 head which lost 90% of the volume on the lead channel. Still works fine on the clean channel. Changed power and pre-amp tubes with no difference. All other functions of the amp work properly. Any suggestions would be appreciated.

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  • glp79fs01 Mar 27, 2011

    I have a Peavey VK100 guitar amplifier which has a low volume on the lead channel. The clean channel has normal volume and all other functions operate correctly. All of the power and pre-amp tubes have been replaced with new tubes. All cables and speaker connections are fine since it operates correctly on the clean channel.

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Do you feel confident with getting into the guts of the amp? If so you need to gain access to the circuit area. Look on the back of the input on the Lead jack circuit, follow the circuit, on the tip contact of the jack (if you plug in you jack cord the tip will contact one of the metal prongs) look for a resister on this circuit that will be soldered to the contact and then solder to the chassis as a ground. It should be a 1meg ohm resistor. If you use a good hot pedal and run it hi on the input this can cause the resistor to overload and break down. Look for a cold solder joint (failed solder joint) also on this input circuit. Hope this helps.

Posted on Mar 27, 2011

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  • Master
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Hi

First check to make sure the speaker cone or cones are properly connected and the connections are not loose. This is often the cause of intermittent sound in an amplifier. Check the speaker connections. Make sure the wiring connected to the speakers is firmly connected and is not loose. On some cases you may have to remove the chassis with a screwdriver to do this.

Use a continuity tester to check the continuity of the cabling that you are using to connect your guitar to your amplifier. While this is not a problem directly associated with the amplifier itself, it is a very common cause of intermittent sound. Make sure there is no oxidation on the input or output jacks of the amplifier. Replace any jacks with oxidation with new, clean jacks. Remove the chassis and cover with a screwdriver, unscrew the jack and put in the new one.

Swap your vacuum tubes one at a time if you are using a tube amp. While this is a somewhat long procedure, an overheating tube is a very common reason for a guitar amp to have no sound or intermittent sound. Turn off your amp to swap out tubes. Remove the tube and insert a new one. You may be able to tell if a tube is extremely hot by simply putting your hand near it and repeating the process with the rest of the tubes, although this is shoddy at best. Check for any loose solder joints on the inside of the amplifier. When an amplifier gets particularly hot after a long period of use, solder joints can start to open up and disconnect themselves. Check solders joints by removing the chassis while the amplifier is still warm.

Please get back to us if you have further query else please accept the suggestion.

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Posted on Mar 27, 2011

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