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Old 15th October 2012, 05:50 PM   #1
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Default 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.
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Old 15th October 2012, 05:57 PM   #2
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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?
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Old 15th October 2012, 06:02 PM   #3
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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?
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Old 15th October 2012, 06:04 PM   #4
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Here is a pic.
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File Type: jpg brutus 2005d ebay.jpg (24.6 KB, 186 views)
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Old 15th October 2012, 07:37 PM   #5
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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.
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Old 26th October 2012, 06:39 PM   #6
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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???
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Old 26th October 2012, 08:05 PM   #7
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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.
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File Type: jpg IMG_0474x.jpg (129.4 KB, 158 views)
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Old 26th October 2012, 08:22 PM   #8
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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???
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File Type: jpg Hifonics Brutus 2005D 001.jpg (1,001.3 KB, 153 views)
File Type: jpg Hifonics Brutus 2005D 002.jpg (970.5 KB, 144 views)
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Old 26th October 2012, 09:55 PM   #9
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I've never seen that board with those transistors. This post shows the board with the original transistors.
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Old 26th October 2012, 10:25 PM   #10
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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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