soundstream TRX1000D need parts

morlac · 6th February 2011, 10:55 PM

Hi im a technician needing advice from a engineer I'm working on this amp which mosfet transistors are fried and can't get the original part and need a suitable replacement for it. The original part number is IRF746N and there isn't any available. I think IRF740 might work as a replacement but there is no data sheet on the original part.

Th3 uN1Qu3 · 11:40 PM

Remove all the original output mosfets from the board, apply power, and check the rail voltages. The IRF740 is a good mosfet but it may not be optimal for your amplifier. I see it's rated for 500W on 4 ohms and it appears to be a full bridge, at least that's what i can make out of the marketing blurb. In that case the rail voltage will be around 140 volts or +/-70v if it's a half bridge. It is also rated for 1 ohm operation which means you have a worst case current of 32 amps for the rated 1kW. That takes a lotta mosfets!

pergo · 7th February 2011, 09:13 PM

power supply mosfets are IRFZ46N

Maybe you read 7 instead of Z.

http://www.irf.com/product-info/data...ta/irfz46n.pdf

6th February 2011, 10:55 PM	#1
morlac diyAudio Member Join Date: Feb 2011	soundstream TRX1000D need parts Hi im a technician needing advice from a engineer I'm working on this amp which mosfet transistors are fried and can't get the original part and need a suitable replacement for it. The original part number is IRF746N and there isn't any available. I think IRF740 might work as a replacement but there is no data sheet on the original part.

6th February 2011, 11:33 PM	#2
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	Remove all the original output mosfets from the board, apply power, and check the rail voltages. The IRF740 is a good mosfet but it may not be optimal for your amplifier. I see it's rated for 500W on 4 ohms and it appears to be a full bridge, at least that's what i can make out of the marketing blurb. In that case the rail voltage will be around 140 volts or +/-70v if it's a half bridge. It is also rated for 1 ohm operation which means you have a worst case current of 32 amps for the rated 1kW. That takes a lotta mosfets! __________________ "Audio grade" components simply means that they failed at a more critical job. Last edited by Th3 uN1Qu3; 6th February 2011 at 11:40 PM.

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7th February 2011, 09:13 PM	#3
pergo diyAudio Member Join Date: Dec 2008	power supply mosfets are IRFZ46N Maybe you read 7 instead of Z. http://www.irf.com/product-info/data...ta/irfz46n.pdf

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