Question about Ashdown Klystron 500w Bass Amp Head

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Hi ther the fuse has blown on the speaker out circet on my new amp any ideas why this would happen?

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The fuse blew because of excess current. The cause of the excess current is either excess volume, a short in the speaker, OR the amp has failed and is shorted to one of the power rails internally and is driving DC current out.

Replace the fuse and use a meter to check the output voltage with NO speaker connected. It should be under 1/2 volt period. If it is, then check the resistance of the speaker. The DC resistance should be a little less than the rated impedance. Otherwise if the amp is kicking out a higher voltage or blows the fuse again, have the amp repaired.

Posted on Mar 28, 2011

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Posted on Jan 02, 2017

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Hi, your amp has a short if the fuse is blown - it needs to be repaired - we can fix it - look on ebay. Thanks.

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It sounds like you have a dead guitar cable or the preamp section of the amp is blown. It needs to go to the shop. It's way cheaper in the long run to just take an amp in. If you try poking around without knowing what you're doing you can fry something more expensive or worse yet yourself! There are leathal voltages in a guitar amp!

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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

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Hello, amplifier suddenly stops playing.The loudspeaker is very hot. I do not see the fuse.The control light is on, but the amp does not play.Please help me.This is the amp: Fender Frontman 65R. ...


There is something a bit more serious than the fuse. I would start by checking that the speaker itself is the correct type. This should be a 8 ohm speaker. Then I would play it and see if the output transformer is hot. This may be over driving the speaker. I would also look at the main power transformer. You might have one with the export transformer which can work with 110 or 220. I have no idea of your location so no idea which is your local level. Something is either over volt or over amps. Most of this amp runs at 15 volts and digital runs very cold compared to a tube amp.

I looked over the schematic and I just can't see anything else that would do that other than the things I have mentioned. A hot speaker is "very"unusual. If you can check the voltages with a meter this should be easy to point out the cause. It shouldn't take much for a amp tech to sort it out if you have to take it in. I wouldn't run it that much until fixed. When you see abnormal heat then something is being stressed. So you can cause more damage by using it. There may be a problem with the power transformer or votlage regulator stage but since the speaker is heating that could end up needing replacement if run too long.

Without having it in front of me I would sayy you may be looking at a new power transformer.or diodes and possibly caps. Any of those could cause the base issue. This is different enough with the hot speaker than I'm not that sure without seeing it.

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Hi I ve had the cd10 for a year and it's been used twice . The problem is the amp powers on with out the popping speaker sound the led is showing red which is the powers on but get no sound what so...


Hi there.You may have a blown fuse.Unplug the amp then undo the screws that hold it all together.Remove the wires off the speaker and put an AA battery across the speaker connections(of the speaker).You will hear a clicking sound if the speaker is ok.If not then the speaker is blown.This could also damage the circuitry.Check the fuse(s) and replace with exactly the same rating.Assemble and test if still no go then the circuitry is faulty.You could then take it to a repair shop and ask for a quote to repair it.
It might be cheaper to buy a new unit.

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The power amp section has blown parts. You will likely find they use a chip like the TDA7293 as the power amp output and it will be blown, shorted causing the fuse to blow. These cost $6 from Digikey.com. Find a competent tech to replace it and use heat sink compound. Verify the part before ordering one. They come with leads bent either way so make sure you get the one with a matching suffix letter. When firing up after repair, put a 60 watt light bulb in series with the hot power lead to act as a current limiter... saves blowing fuses if there is another problem.

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1 Answer

Is there a fuse in this amp? is it replaceable without soldering?


Hi, blowing a fuse in an amplifier is a problem that most guitarists face at one time or another. If an amp won't turn on, or it turns on for a second, then makes a popping sound and turns off, the problem is usually a blown fuse. Though a blown fuse can be a hassle, especially during a performance, it does not have to put a stop to your musical enjoyment. With a spare fuse you can be back jamming to your favorite tunes in no time flat.

Things You'll Need

Fuse.

Instructions

Turn off the amplifier and unplug it from the wall.

Locate the fuse, which is usually found at the back of the amp. The fuse will look like a small black wheel sticking out of the amp with a number and the letter V next to it. For example, 9V.

Gently turn the fuse counter-clockwise to remove it from the amp.

Discard the old fuse.

Insert the new fuse into the empty fuse slot and turn it clockwise until it is firmly in place.

Plug in the amplifier; make sure the power switch is in the off position.

Turn the amplifier on to make sure the new fuse is working properly.



Hope it helped..

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Another person posting on here I suggested opening his unit and he had blown speakers. I think these that are DOA after previous use may be blown during the previous shutdown of the amp driving them and those with built in amps are blown when mixer is powered down putting out a large pulse. Hopefull the amp is blown rather than the speakers... cheaper to repair. Open and check for a fuse, but dont' replace it until you find out the cause of it blowing as additional damage can occur.

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1 Answer

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Dan

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it could have blown the speaker, a regular guitar amp is not meant to handle a bass, you should be able to look into the back of the amp and see if any of the speaker is damaged, or there may be a blown fuse inside the amp, if you check for this please MAKE SURE TO UNPLUG THE AMP FROM THE POWER SOURCE FIRST, and if needed replace the fuse with the exact same type

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