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Old 10th November 2010, 12:08 AM   #1
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Default MTX 2300 X

Im in the process of bringing this amp back to life. The modle i have is the 2300x Black heatsink with gold lettering.

I have a couple questions

Wondering what is a good power supply fet for this amp?? Since the fets are missing.

There is a resistor thats to burnt to tell the value wondering if anyone knows the value of R429 located in front of the rectifier.

And what transistor goes in Q220's spot since its missing
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Old 10th November 2010, 01:05 AM   #2
Dr Zeus is offline Dr Zeus  United States
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This is an image from an MTX Thunder 4320. Perhaps is close to what you are missing?

The resistor on mine is 2k ohms.

Click the image to open in full size.

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Old 10th November 2010, 06:41 AM   #3
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Does the amp have both rectifiers together or does it have one on each side?
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Old 10th November 2010, 02:28 PM   #4
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Amp has 1 on each side.
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Old 10th November 2010, 02:34 PM   #5
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The photo I have isn't too very good but it appears that Q220 is an MPSA42. Since the circuit board designations are under the components, I can't tell which is R429. Look at the photos.
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Old 10th November 2010, 03:12 PM   #6
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The resistor thats missing in mine is the 1 closet to the cap in the row with 4 resistors. It looks like a 22.1 ohm resistor from what i can see is this correct?

Also i have another 2300 amp but the board is totally different.

The one im repairing is the 2300x and the other one i have is a thunder 2300 is there a difference in output of theese amps or about the same?
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Last edited by mike49504; 10th November 2010 at 03:15 PM.
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Old 10th November 2010, 03:17 PM   #7
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The ones closest to the caps are 22.1 ohms.

The power output is essentially the same (as far as I know) but the one with the 6 power supply FETs is probably more reliable. Most have labels on the back of them that give the power ratings.
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Old 10th November 2010, 03:27 PM   #8
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I also noticed this amp has the same problems as the other 2300 i have,The 1N4148 diodes by the output transistors are shorted is this a common problem when the outputs go?


Also im gonna be fixing alot of problems in the output section since i found someone tryed repairing this amp themselfs and had 540's on 1 side for the outputs and irfz48's on the other side , Gotta love it
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Old 10th November 2010, 03:31 PM   #9
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Are you sure that they're 1N4148s?
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Old 10th November 2010, 03:40 PM   #10
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Ok maybe i was wrong . I cant make out 1 of the numbers on it .

It says 1N4150 or 1N4450 do either of thoose sound familar?
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