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-   -   Pyramid PB-777 (http://www.diyaudio.com/forums/car-audio/166506-pyramid-pb-777-a.html)

mike49504 7th May 2010 08:23 PM

Pyramid PB-777
 
I recieved this amp in for repair. It has a blown power supply. The are using IRFZ46's for the fets and 100 ohm gate resistors. Wondering if i can swap the fets for something different since i dont have any 46's in stock at the moment. Im ordering alot of parts next week sometime but wanna try to get as many amps done this weekend as i can before i place the order.

mike49504 8th May 2010 03:56 AM

Ok nevermind I found the last 4 that i had in stock

mike49504 2nd June 2010 12:56 AM

I got this amp back and the guy blew the power supply again by clipping the amp.

The fets are IFZZ46's with 100 ohm gates resistors.

Is there a lil bit better fet i can put in this amp?

1moreamp 2nd June 2010 01:32 AM

Irfz48 will work and 72 amps rated as i recall, but thats not likely going to stop the guy from killing the power supply.
I am thinking something else is wrong with his install like 16 gauge power wires and poor grounding and etc... the list is endless.. but it sounds like your repairing the symptom, not the problem, IMO......:)

mike49504 2nd June 2010 02:30 AM

I think you are right. When the amp came back in the gain was turned fully clockwise and the crossover setting was at 450 hz to run the subs.

Id hate to see his wiring job. I played the amp in my truck for 1 hr while driving around and i couldnt kill it he had it for 2 days and it went up in smoke.


Im also repairing another one of his amps and in his truck the amp makes a loud hissing noise something internal but when i hook it up in my truck and pound the heck out of it i get no noise and the amp plays fine.

So your probably 100% right on that one.

Thanks for the info on the fets I greatly appericate it.


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