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Old 28th July 2010, 07:17 PM   #1
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Default Dei 2101 amp

This amp has a blown power supply . The fets they are using are NDP508AEL.

Is there a good cross for theese??

They are using 100 ohm gate resistors.
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Old 28th July 2010, 07:43 PM   #2
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It's strange to see 80v FETs in the supply. Are they the original parts?

If the amp uses a typical drive circuit, the IRFZ44 should be a good sub.
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Old 29th July 2010, 02:38 AM   #3
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Thet appear to be orginal. I put the irfz44's in. Not sure whats up with it now but the amp is drawing around 20 amps of current at idle
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Old 29th July 2010, 02:41 AM   #4
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Have you checked the driver transistors?

Can you post a photo of the power supply area of the board?
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Old 30th July 2010, 12:37 AM   #5
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Heres some pics of the board.
Attached Images
File Type: jpg Picture 376.JPG (90.7 KB, 51 views)
File Type: jpg Picture 377.JPG (105.9 KB, 50 views)
File Type: jpg Picture 378.JPG (115.3 KB, 49 views)
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Old 30th July 2010, 08:26 PM   #6
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Have you checked the driver transistors?

Is that a bad capacitor near the power supply board?

While it's drawing excess current, what is the DC voltage across the emitter/source resistors?
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Old 2nd August 2010, 05:04 PM   #7
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The driver transistors are shorted in this amp.

They are marked 2L is there a goog sub for theese??
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Old 2nd August 2010, 05:21 PM   #8
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The 2L is a high voltage transistor. If this is for the power supply, the MMBTA56 will be a good sub. If this is for the audio section, you'll likely have to use the exact replacement (MMBT5401).
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Old 2nd August 2010, 06:08 PM   #9
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I have the following transistors on hand.

1A
2A
2T
2X

will any of thoose work cant remember what they are?

if not whats the mmbta56 markings?
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Old 2nd August 2010, 08:09 PM   #10
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Use the 2T.

The SMD Code Book
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