Profile 400SX

[mike49504]

This amp is using P50n06's for the power supply fets, 47 ohm gate resistors

Would the IRFZ34's work?

[mike49504]

Or is there a good cross to thoose (p50n06)

[Perry Babin]

Z34s aren't rated for enough current. Z44s should work.

[mike49504]

Ok got this amp back after he blew the power supply due to clipping the amp..

I put new power supply fets in the amp and new drivers.

Amp will still not power up .

On 3 oftf the power supply fets i get

Leg 1:1.92
Leg 2:13.92
Leg 3:0.71


And on the other 3 i get

Leg 1:-13.91
Leg 2:13.92
Leg 3:-13.91


3 of them appear to be defective but they are brand new and so are the drivers..

Any ideas?

[Perry Babin]

You can't get -v on the power supply FETs. It appears that you had the black probe on the B+ terminal. Recheck the voltages.