autotek xs1500.1

[DREW028]

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?

[Perry Babin]

IRFP064N in the power supply.

Only use the IRF3710Z if the output transistors have failed and you need replacements.

[DREW028]

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?

[Perry Babin]

The parallel resistors are OK. R39 should be the same as R38.

[DREW028]

With the new output FETs would it be ok to run it with the protection modded?

[DREW028]

Have you ever used or heard about avnetexpress? They have the irf3710z for $.58 and a few other FETs i need for cheap.

[Perry Babin]

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.

[DREW028]

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.

[Perry Babin]

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.

[DREW028]

No outputs fets, rectifiers in 63.5vDC on center leg (both rectifiers) black probe on amp ground.