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04-12-2010, 05:27 AM
| | Registered User | | Join Date: Jun 2009 Location: Orange County, CA | | | problem with class AB amp and class D amp
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How do i fix these? I understand there are some amp gurus out here on TB and i'd like to ask for your help.
the AB turns on but output is very low? theories?
the D does not power on yet the fuse is good. ideas?
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Christian Praise & Worship Member #704
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04-12-2010, 10:19 AM
|  | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | | Sorry, my ESP isn't working. I can't tell what brand and model they are, and can't see their symptoms. Maybe another amp guru has his or her psychic powers up and running. |
04-12-2010, 10:27 AM
|  | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | | Isn't it obvious? The AB one needs to have its caps rotated, and the class D one needs a new dilithium crystal. |
04-12-2010, 11:49 AM
|  | vintage bass nut
John K Custom Basses | | Join Date: Feb 2008 Location: Thousand Oaks, CA | | my ESP is working perfectly, but i still can't figure it out. 
BTW, does anyone know why my wife's car won't start? |
04-12-2010, 12:02 PM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | Quote:
Originally Posted by johnk_10  BTW, does anyone know why my wife's car won't start? | GAS?????
Paul |
04-12-2010, 12:05 PM
|  | Registered User | | Join Date: Aug 2006 Location: Coeur d'Alene | | | Your flux capacitor is not getting enough gigawatts.
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"Resentments are the rocket fuel that lives in the tip of my sabre." |
04-12-2010, 12:07 PM
| | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | Jimmy M suggested a broken framistat in the globulator in another thread.
Paul |
04-12-2010, 12:15 PM
| | vintage bass nut
John K Custom Basses | | Join Date: Feb 2008 Location: Thousand Oaks, CA | | Quote:
Originally Posted by BassmanPaul GAS?????
Paul | i had GAS but i took some beano for that.
thanks for the suggestion though. |
04-12-2010, 12:20 PM
| | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | Quote:
Originally Posted by BassmanPaul Jimmy M suggested a broken framistat in the globulator in another thread. | That's just a myth. Jimmy is so obsessed with his Ampegs that he thinks all amps have framistats.  |
04-12-2010, 12:31 PM
| | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | Well Bongo, as you know, the framistat controls the amount of power that the globulator can draw from the alternate reality at any moment in time. This power is measured in Frams. Obviously it has failed as the Class D amp is switching on but receiving no power. You can tell that the globulator is working otherwise the amp would have disappeared into a vortex connecting the various dimensions.
Paul |
04-12-2010, 12:33 PM
| | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | | And before anyone brings it up, the framistat in a class D amp is not necessarily digital! |
04-12-2010, 12:35 PM
|  | I Know Nothing | | Join Date: Dec 2003 Location: Columbia River Gorge, WA. | | Quote:
Originally Posted by Bob Lee (QSC) Sorry, my ESP isn't working. I can't tell what brand and model they are, and can't see their symptoms. Maybe another amp guru has his or her psychic powers up and running. | The hamsters need food Cap'n. I don't think they can take much more! |
04-12-2010, 12:35 PM
| | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | Quote:
Originally Posted by Bob Lee (QSC) Sorry, my ESP isn't working. | In this case Bob you should take the bass back to the manufacturer and have the wiring checked out!
Paul |
04-12-2010, 12:36 PM
|  | zulu as kono
Endorsing Artist: FEA Labs Effects | | Join Date: Jun 2004 Location: los angeles, CA | | | It's all ball bearings these days. I check that first. |
04-12-2010, 12:37 PM
| | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | Quote:
Originally Posted by Bob Lee (QSC) And before anyone brings it up, the framistat in a class D amp is not necessarily digital! | LOL great one Bob! 
Paul |
04-12-2010, 12:37 PM
| | In case you missed it, I work for QSC Audio!
Applications Engineer, QSC Audio | | Join Date: Jul 2001 Location: Costa Mesa, Calif. | | Quote:
Originally Posted by BassmanPaul In this case Bob you should take the bass back to the manufacturer and have the wiring checked out! | I was hoping someone here might tell me how to fix it. |
04-12-2010, 12:40 PM
|  | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | Quote:
Originally Posted by namuxtree How do i fix these? I understand there are some amp gurus out here on TB and i'd like to ask for your help.
the AB turns on but output is very low? theories?
the D does not power on yet the fuse is good. ideas? | Not enough information, but...
both need to be seen by a qualified tech. Probably looking at a bench fee of ~$65 each plus addt'l labor & parts (like a deflostigator, boards, MOSFET chips, dip, etc.)
What are the brands, models, approx. age?
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
04-12-2010, 12:42 PM
| | Registered User | | Join Date: Dec 2002 Location: Virginia Beach, VA | | Quote:
Originally Posted by BassmanPaul This power is measured in Frams. Obviously it has failed as the Class D amp is switching on but receiving no power...
Paul | I've seen this happen in dirty power situations. The OP could definitely use some Fram filters (available from AutoZone).
Riis
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"20% of the money will buy you 90% of the sound..another 30% of the money will buy you another 5% of the sound..you can't buy the remaining 5% of the sound because nobody can agree about what it is." |
04-12-2010, 12:59 PM
| | OVNIFX
EXAR pedals rep for North & Central America | | Join Date: Oct 2005 Location: PDX, OR | | Well played. |
04-12-2010, 01:20 PM
| | Registered User | | Join Date: Jun 2009 Location: Orange County, CA | | | if i didn't give enough information you guys should just say so and then stop. No need to veer off on senseless chatter....anyways...
I have an Eden WT-800 and a Markbass Little Mark Tube and my friend has the exact same setup. Both my amps are fully functional but my friends' amps are both not. We've opened up mine to check for any obvious flaws there may be that our untrained eyes can see. So far no luck. UPDATE* Am i to believe that the regular LMTube is an A/B?
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Christian Praise & Worship Member #704
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