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Hi i have a laney guitar amp which works perfect but cuts out the sound and comes back on when it feels like it , ive tried to find the cause but im left stumped all the components seem to work fine and i cant find any short circuits or other reason would it be a component cutting out after heating or is it somthing else ?

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Could be a dry solder joint, turn it off and then check all connections , use a magnifying glass, makes life easier.

Posted on Apr 30, 2008

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Hi, The sound cuts out frequently, is it blown?


Not if it comes back. Blown isn't a temporary self-healing condition.

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.


Check for loose speaker connections as a root cause for intermittent shutdown.

Feb 16, 2011 | Sony STR-DE675 Receiver

2 Answers

Kenwood krf-v5090d cuts out when its turned up loud


Check for loose speaker connections as a root cause for intermittent shutdown.


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Feb 11, 2011 | Kenwood KRF-V5090D-S

1 Answer

Hifi was pushed to its limits over new year and cut off which im guessing is some sort of limiter but now i have severe volume drop out, could this be a blown fus internally and is there a possibility that...


An amp cuttting off in response to being overdriven is a limiter along the lines of a heart attack. Usually, distorted sound is a clue it's getting ready to blow.


A precise make and model might yield more-specific answer.


Generally speaking, an amp protects itself from heat, shorts and overloads.


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Jan 21, 2011 | Audio & Video Receivers

1 Answer

Hi. i love my sansui. it worked yesterday but today it only comes on but no sound. the sound will kick in for a second at a very low volume but immediately will cut off. plz help thanks.


Generally speaking, an amp protects itself from heat, shorts and overloads.

Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not
blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or
cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose
which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Jan 16, 2011 | Audio & Video Receivers

1 Answer

Hi, i just bought a gnx-3 guitar processor and it hums loudly.


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Sounds like a bad cable or pickup. Set the volume to a level that you can tolerate. You may want to turn off the amp between each of these steps. Unplug the cable from the amp; if the hum does not go away you have problems with the amp. If it does then plug the cable into the amp and short the end that plugs into the instrument. If the hum goes away it is the pick system in the instrument, if not you have a bad cable.
Good Luck
Gilshultz

Mar 01, 2010 | Audio & Video Receivers

1 Answer

My Behringer gx212 ultratwin amplifier started to lose volume last night at band practice and then I smelled buring wiring. I think I lost or am in the process of losing the amp transformer. I think the...


Hi I just recently purchased a Behringer GMX 212 and had similar volume dropout on the clean channel only Channel 2 works better and has more punch in clean mode.I went to the shop where I purchased it with a 7 day warranty from some indian dude here in Nadi Fiji, and there was another GMX 212on the floor so I decided to try it out. This was a new amp. I plugged into the clean channel and turned it up full volume on guitar and amp adn heard the volume drop of in the amp in almost a curve and then the whole amp just cut out. We unplugged and waited, turned the amp off, and then on and stil no sound. We then tried the guitar and cord in another amp. The other amp was fine. Can you solve this problem.......my gut feeling is this happens a lot to Behringer amps.

May 08, 2009 | Audio & Video Receivers

1 Answer

My laney aor series amp has completely stoped working, the valves are still glowing but no sound is coming out


Hi.

Have you checked the HT fuse. the amp has 2 power supplies, one for the tube heaters, and another for the actual operation of the amp. Check that fuse, and replace with exactly the same type if blown. If it keeps blowing fuses, then you may well need to change your output tubes. They don't last forever, and you will get about 6 months out of them in normal gigging/rehearsal use, longer if you don't use the rig at high levels. Be sure also to use a proper speaker lead, not just an instrument patch lead, poor connectivity from anything that is not heavy duty can cause your amp to blow fuses, AND pop valves. I am happy to talk more to you about it, I have had a long love affair with valve amplifiers, both building and repairing them.

regards
robotek

Nov 08, 2008 | Audio & Video Receivers

1 Answer

Guitar amplifier cracks when turning off


So when you hit the power switch to turn it off you get a crackling sound? This is fairly common with many guitar amps as they don't have a relay which cuts the speaker output when the switch is turned off. What you are hearing is the capacitors draining down. If all else works ok with the amp then there's nothing to worry about.

Oct 06, 2008 | Audio & Video Receivers

1 Answer

I was playing guitar through my fender 85 amp and the volume suddenly cut out to almost nothing and I couldn't make it loud again?


The speaker could be blown. Try touching a 9volt battery to the terminals on the speaker. If the speaker makes a popping sound its not blown. The other culprit could be the input jack of the amp. If its soldered directly to the board. The retaining nut may have come loose and the jack wiggle around with the cord tension. resulting in a solder connection breaking at the board. But that usualy will give a ground hum or no sound at all. So im leaning towards a blown speaker. (providing its a solid state amp) If it's a tube amp. it could be that one or more of the power tubes are bad or have a vacuum leak and may need to be replaced. ( you have to replace all the power tubes at the same time and have the amp biased.

Aug 19, 2008 | Audio & Video Receivers

2 Answers

Distorted sound coming out of SW channel only


try turnind down the sub from the amp itself it might be putting out more volts than the subs input can handle check your standing wave feature to make sure the trim is not up too high

Jan 13, 2008 | Pioneer SX-315

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