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seankane 15th October 2012 06:50 PM

Hifonics Brutus BX 2005d
Hello I have not worked on a hifonics amp before, can someone tell me what this amp usaes for power supply fets and output fets? I have a broken one on the way and want to get a start on getting parts together.

Perry Babin 15th October 2012 06:57 PM

The BXi2006 used FQP85N06s but I'd likely use 3205s as subs. I don't have any photos of the 2005 so I'm not sure what they used.

The protection circuits in these amps are pretty good and I rarely see a blown power supply. Are you sure that this one has failed?

seankane 15th October 2012 07:02 PM

The guy said it is broken and something inside is clunking around, so I am assuming a capacitor has come desoldered from somewhere and is floating around in there. I didnt get many details. I just want to be prepared.

I only paid $55 for the amp so I figured I could give it a shot, seems to be a pretty powerful amp from looking at the specs.

I owned a brutus 1500 before and had it on 3 jl audio w3's and was very impressed.

I wonder what would be the difference in the BX2006 and BX2005 just different year models you think?

seankane 15th October 2012 07:04 PM

1 Attachment(s)
Here is a pic.

Perry Babin 15th October 2012 08:37 PM

I don't know if there will be a difference. For at least one model, there were two completely different boards so I don't know how consistent that they will be.

seankane 26th October 2012 07:39 PM

Well I recieved the amp today. All the power supply fets (FQP85N05) have been removed. Someone has attempted a repair on this unit. The gate resistors they installed are 22ohm but are to big and poorly installed.

Were the originals 22 ohm and if so were they 1/8 watt?

There are also some transistors poorly soldered on a driver board near the rail caps, dont know if there the right ones they are marked A1266 and there is only 3 of them or what they are suppose to be????

I will be replacing the power supply fets with IRF3205 and 47 ohm through hole resistors just need to know if they are suppose to 1/8 watt or what looks like they used 1/4 watt and they are to big for the spot on the board.

Any advice would be great and anything else I should be looking for asside blown outputs???

Perry Babin 26th October 2012 09:05 PM

1 Attachment(s)
I don't have anything on this amp but many of the amps that used 1/8w gate resistors used 22 ohm resistors. The ones with 1/4w resistors tended to use 47 ohm resistors.

If the layout is similar to the attached photo, there should be 4 1266s. There is one 1266 and one diode to drive each of the 4 banks of FETs.

seankane 26th October 2012 09:22 PM

2 Attachment(s)
This amp is different and I have not confirmed but dont think its a 4080 amp. The parts yours show are not in this amp and it has a driver card next to the rail caps.

Pic 1 of board

Pic 2 of driver card with 3 1266's soldered on and I dont know if they are original I would say not by looking what do you think???

Perry Babin 26th October 2012 10:55 PM

I've never seen that board with those transistors. This post shows the board with the original transistors.

bl4ckw1d0w 26th October 2012 11:25 PM

I have that same exact board, same driver card, everything internally. The only difference is mine came in a 2006 chassis. It has 1/4 Watt 47k ohm resistors. IC1 is a KA7500BD. If you need any references on the board I can be of some help.

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