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Old 1st March 2012, 08:55 PM   #1
DREW028 is offline DREW028  United States
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Default autotek xs1500.1

Does anyone know the part number is for the power supply FET's?


Also Perry i seen in another one of your post you recommended changing the output FETS to the IRF3710Z?
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Old 1st March 2012, 10:22 PM   #2
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IRFP064N in the power supply.

Only use the IRF3710Z if the output transistors have failed and you need replacements.
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Old 2nd March 2012, 02:39 AM   #3
DREW028 is offline DREW028  United States
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2 failed so I guess ill have to replace them all.

Thank You!

This amp also had 2 more added resistors soldered in at locations r37 and r40. Do you know if this modifies the protection for the amp? Also r39 location is empty, should it be?
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Old 2nd March 2012, 10:20 AM   #4
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The parallel resistors are OK. R39 should be the same as R38.
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Old 4th March 2012, 03:11 AM   #5
DREW028 is offline DREW028  United States
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With the new output FETs would it be ok to run it with the protection modded?
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Old 4th March 2012, 05:09 AM   #6
DREW028 is offline DREW028  United States
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Have you ever used or heard about avnetexpress? They have the irf3710z for $.58 and a few other FETs i need for cheap.
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Old 4th March 2012, 07:02 PM   #7
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I don't know precisely how the protection circuit has been modified so I can't tell you it would be safe. I'd guess it would not since it failed to protect the outputs.

I don't buy from that distributor. I generally recommend Future, Arrow, Digi-key and Mouser.
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Old 9th March 2012, 01:41 AM   #8
DREW028 is offline DREW028  United States
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Output FETs are out as well as the rectifiers.


Just installed the power supply FEts and everything seems ok.

i see this amp doesn't have a negative rail on the power supply am i correct?

On the outside pins of the rectifiers im reading +32vAC (on both rectifiers). Center leg to the outside legs im reading +15vAC (both rectifiers). Does this sound right?

I haven't gotten the replacement output FETs yet. Hopefully soon, i am very excited to see this amp work. Thank you!

How do i check IC6 and IC5? I downloaded the datasheet but am not sure what reference to ground to use.
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Old 9th March 2012, 01:50 AM   #9
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The amp only has positive rail voltage for the output transistors. I've never needed to measure the voltage the way you did so I don't know if it's right.
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Old 9th March 2012, 03:11 AM   #10
DREW028 is offline DREW028  United States
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No outputs fets, rectifiers in 63.5vDC on center leg (both rectifiers) black probe on amp ground.
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