Question about Behringer ULTRAGAIN PRO MIC2200 2 Channel Tube Mic Preamp Microphone
At first, it works fine. Then suddenly the signal meter light climbs to full and then the clip indicator lights stay lit on both channels. At that point, there is total loss of any output signal?
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Posted on Jan 02, 2017
check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.
Posted on Aug 22, 2007
It sounds like the final amplification section is OK now. I'd be looking for a noisy transistor or transistor pair at the "front end" of the unit. There may also be a shorted coupling cap between the stages. If you can Email me the schematics, I can provide more details.
Posted on May 27, 2009
SOURCE: Low output on LH channel
This sounds like the output section has failed Open rather thans Shorted. You are essentially driving the speakers with the "driver" section rather than the final output stage. This unit will require benchtime to trace the problem and fix it. This is not a problem that can be completely diagnosed remotely. Where are you located?
Posted on Aug 20, 2010
There are several clipping indicators on this board. Do you mean that the small vertical display to the left of the FX selection window is maxed out from top to bottom? I will assume that you have ALL the FX inout knobs CCW for all channels AND the FX slider all the way down. Also does the FX selection knob work to change the effect number? Does the rest of the board work? WILL the effects pass sound when you send it through the effects? You say no sound, but was that just to say with no sound sent to it it still is clipping, or that it will not pass sound?
Posted on Oct 20, 2010
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CLIP: red, to the left of each Gain control.
Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.
During muting, the indicator fully illuminates. This occurs during normal "On-Off" muting.
•Bright red illumination while the amp is being used indicates either thermal muting or a shorted output.
•If the amplifier overheats, the fan will run at full speed, and operation should resume within one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.
•A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheating.
•If distortion is audible without a Clip indication, the problem is either before or after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to prevent input overload.
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