brutus bxi 1200w

[timwebb]

i have this amp i rebuilt the powers supply.new gate resistors drive transistors.but every time i put a fet in the power supply it goes into protect. it has 3.40 on the gate and a good signal.what could i be missing?

 

[Perry Babin]

Does it go into protect if you remove the rectifiers?

 

[timwebb]

yes.

 

[timwebb]

ok now it does go into protect when i put the rectifiers in .

 

[Perry Babin]

To clarify... Does it always go into protect mode (with and without the rectifiers)?

Does it remain in protect mode if you leave the amp powered up?

 

[timwebb]

yes.it goes into protect with the rectifiers. with out them in it power up fine.

 

[Perry Babin]

Post a photo of the board so I can see exactly which amp this is.

 

[timwebb]

.

 

[Perry Babin]

I would suspect the two transistors in the rectangle in the attached photo. They are MMBTA42s.

I'm assuming that you've carefully checked all of the output transistors.