Question about Audio Players & Recorders

Open Question

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

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


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 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....


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

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

Testimonial: "That's what I am doing right this second!"

  • 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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The amp cut off and is not coming back on

Sounds like you burned out the sub channel usually due to having a sub the draws more watts than the system can push, effectively blowing a capacitor or node within the internal motherboard of the AMP.

Oct 09, 2013 | Hartke Refurbished B Series B150 15 Watt...

1 Answer

Ha3500 hartke sound goes off with a click after 5 seconds .what is causing the problem

Sounds like the loudspeaker relay switch is disconnecting the spkr.
i) Check heat sensor on heatsink has good connection to PA board. Dust on h'sink/fan usually needs vacuuming off!
ii) Check voltage on the amplifier output resistor R334 is at 0v (referenced to chassis) - if this voltage is raised,the amp stage is faulty.
Otherwise the fault lies in the speaker protection stage (IC301).

Sep 24, 2013 | Hartke Ha2500 250watt Bass Amplifier Head

1 Answer

Trying to find the right fuse for a eden World Tour 800 bass amp

Well, hope this helps you.

Fuse Requirements:
USA @ 120 Volts /60 HZ - 10 Amps, 5 x 20 mm GMC/T/slow blow
Europe @ 240 Volts/50 Hz - 5 Amps, 5 x 20 mm GMC/T/slow blow
Japan @ 100 Volts/60 Hz - 12 Amps, 5 x 20 mm GMC/T/slow blow

Mar 10, 2013 | Hartke HyDrive HX410 4x10 Bass Cabinet...

1 Answer

Output transistor number for lpa1180

LPA1800 power amp uses 2 x MOSFET transistors on the output. IRFP9140 AND IRFP140. Also check T4 (MJE340) and T5 (MJE350).

Feb 05, 2013 | Behringer bxl1800 ultrabass 1x12 180w bass...

1 Answer

Have a hartke lh1000 head . played about 5 total hours then blew the fuse. is this something i shoud be worried about?

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

Jan 19, 2012 | Hartke Lh1000 Bass Amp Head 1100 Watts...

1 Answer

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.


Aug 24, 2011 | Hartke Audio Players & Recorders

1 Answer

Amp is LH500 set up in recording studio ran just fine for about 1hr then just died. Found blown l10at 250v (external fuse) replaced and instantly blows again. Used the amp for 2month US tour in support of...

The amp has likely got a shorted output section or a shorted component in the power supply. Unfrtunately the previous is the most likely AND EXPENSIVE to repair.

Apr 22, 2011 | Hartke Lh1000 Bass Amp Head 1100 Watts...

1 Answer

Looking to buy used bass 3500 hartke,the guy said he hooked up a cd player to it now it doesnt turn on???possibly a power transformer he said??any ideas??thank you

Connecting the CD player should NOT have caused any damage if they were power from the same receptacle and both had grounded plugs OR a walkman type was used which had no external power to it. Power transformers RARELY fail. Check if it has a fuse that has blown BUT do not replace the fuse until the cause of it blowing is found. Switches on a lot of these are POOR and they do fail.

Mar 12, 2011 | Hartke Vx3500 Combo Bass Amplifier * New *

2 Answers

My amp has output but no sound from the speaker.

If you have tested with other speakers, you may have blown the ones that are not working. Test the speaker(s) on another source. I am not sure how you have tested your amp that it "has output"... indicators mean NOTHING on the amps as far as actual power going out.

Jan 29, 2011 | Hartke Ha2500 250watt Bass Amplifier Head

1 Answer

Amps in a seires

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.


Mar 01, 2010 | Music

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

270 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts


Level 3 Expert

5390 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

The Knight
The Knight

Level 3 Expert

75283 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides