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Hartke b120 bass amp....not stable blows new output transistors and drivers ...what do you think ?

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5 Suggested Answers

SOURCE: amp blows fuses

The fuses are there to protect the internals of the AMP.....
Please check that the correct fuses are installed......
if the incorrect ones are installed then a fire may develope...

There should be a manufacturers lable on the external chassis that details the fuses to use....

Fuses now days can be slow blow or fast blow....so the correct fuses must be used.....dont increase the fuse rating past the chassis panel label...but make sure they are correct...if they are correct then the amp needs a service to determine where the peak loadings to the power supply are originating from...

Some one may have installed incorrect fuses in the past...

Cheers from YUBEUT


Posted on Nov 03, 2007

  • 2 Answers

SOURCE: amp : sansui au11000 blown transistors on driver board

Sometimes just replacing the outputs that have shorted are not enough to complete the repair of a main amp...this is because sometimes there is an intermittant or full failure in the bias circuit. Typically the Bias POT is the culpret.....when these pots get dirty or fail, the bias current ramps up way too high and then the Output transistors blow.......always replace the POT as part of the repair.....also check the bias varistor (Diode Stack) as these can open up after the first failure. Always pay attention to the bias circuit as this is critical to completing the repair properly....bias current adjustments can be made by measuring the voltage accross the Emitter Resitors connected to the Power Transistors...should read about 10 millivolts. The MJ15024 and MJ15025 Outputs are perfect replacements for Your Power Amp...I use them as well. Your tech probably just touched the bias pot, and that was all it took to make it fail (Open up)..If he was savvy, he would have replaced that POT before Touching it.

Hope this info helps....

Eric

Posted on Jan 16, 2009

  • 7 Answers

SOURCE: Studiomaster 900E power transitors

read through this thread and you should be able to get a schematic

http://www.diyaudio.com/forums/showthread.php?threadid=140776

Posted on Jun 17, 2009

  • 733 Answers

SOURCE: I need to find output transistors for a Rockford amp

Call rockfor fosgate and ask if they sell component parts to public, if not, ask who the their component manufacturer is, maybe you can get it directly from them.

Posted on Sep 03, 2009

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  • 1591 Answers

SOURCE: speaker blow out with 34vts

Well, this may take some work, but do you have a schematic for the unnamed mystery amplifier?
If so, trace the voltage back to the op-amp chip that's sitting with V+ on it's output with no input, and you`ve found the problem!
Otherwise, if you have an oscilloscope, with no speakers attached, trace the incoming signal until it turns to a DC voltage or til the signal starts riding on a high or low voltage.

Oh, another thing to check, there's usually a couple high wattage low impedance resistors between the power transistors (unless it's a hybrid chip). If one of those resistors opens up, you can have this issue.

Posted on Apr 27, 2011

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Well, hope this helps you.

Fuse Requirements:
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If the fuse is correct ( check manual) it shouldn't blow under normal operation. Once in while a fuse will break internally and thus blow the fuse. look close at the blown fuse If it is a "violent" blow (totally black inside) then you have an overload condition. I would use an ohm meter to check the connection to the speakers. Usually it should be between 8 ohms and 4 ohms if the number is lower than 4 ohms your speakers or wiring are putting to much of a load on the amp. If the fuse was not a "violent" blown fuse then replace with a new fuse of the exact proper value. many amps use an MDL fuse that is a slow blow fuse and has much different in circuit function than a ACG fuse so use only the exact proper furse that the manufacture recomends. If the load (speaker and wiring) is correct and the fuse is correct and still blows then you have a component problem and the amp will need repair

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I have a new ( 2 weeks old) Hartke 5210C combo bass amp. I plugged it in and turned it on, and after about three seconds, I heard a louder click than usual. I plugged my bass in and hit about three notes,...


There is an internal problem with the amplifier circuit. Since the unit is only 2 weeks old, it is clearly under a warranty. Return the unit and request a replacement. Given the short time, the store should not give you a hard time with your request. DO NOT under any circumstances open up the unit as that will void the warranty.

If the store is reluctant to exchange the unit, speak with a manager. Should that fail, contact Hartke directly.

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1 Answer

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2 Answers

My amp has output but no sound from the speaker.


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1 Answer

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I'm not sure what this will do, but electrically you can hook these up. Using the line output from the swx, connect it to the line level input. I think that that would be the active input. When you connect a guitar(without a battery powered pickup) to the hartke, it goes to the passive input right? If so, then connect the line out of the swx to the active input. Reverse if the behavior is opposite of what I described.

Realise that with these two connected to each other, you will be using both pre-amp sections and the amp section of the hartke.

Dan

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