Replacing output transistors (mosfets)

chipper · 25th October 2012, 01:42 AM

I have a small punch 55 here and a good set of IRF540 and IRF9540 that I found in my box of parts. Could I use these in it would replacing the other channel?

Is it okay if use these in it? With out replacing the other channel it still works.

Here's what it says on the fets

IRF540
H6 27

IRF9540
H6 31
N

Perry Babin · 25th October 2012, 01:55 AM

If it's your amp, you can install used parts. If this is for a paying customer or you intend to sell the amp, order and install new parts.

chipper · 25th October 2012, 02:32 AM

Yes it just my amp for my personal collection, but would it be reliable if I wanted to run it my self?

Perry Babin · 25th October 2012, 03:00 AM

That's impossible to say without knowing what the replacement transistors had been subjected to or their age. The date code may be available in the datasheet but you still won't know how hard they've been driven.

If you don't abuse it, they will likely survive.

chipper · 25th October 2012, 03:45 AM

Those mosfets came from a punch 40.2 that I got a whole back it had a blown power supply but none of the outputs were damaged I had used one pair for testing a project amp and left the other two on the board. I wanted to use this punch 55.2 to run a 10" kicker comp single 4 ohm coil sub in a box I'm making. Or use it power speakers.

The parts are made by Harris semi because it has the 'H' printed on them.

Note: I installed them in and it so far it's playing ok I guess I have connected to some test speakers that are 6 ohms on each channel playing full blast. Reaches what I would consider normal operating temps? Hasn't shut off or anything.

seankane · 25th October 2012, 04:49 AM

Not gonna get much power out of that amp at 6 ohms stereo bro.

chipper · 25th October 2012, 04:52 AM

Quote:

Originally Posted by seankane

Not gonna get much power out of that amp at 6 ohms stereo bro.

But do you know if it will be okay for my personal use?

seankane · 25th October 2012, 05:48 PM

Well if it works it works. Like Perry said there is no telling how hard the used outputs you installed were driven. It may last a month it may last for years. Put it in your car and run it hard for a few weeks if it does not let you down I think it will be fine.

Perry Babin · 25th October 2012, 07:40 PM

If it's your amp and you know how to repair it, try them. If they fail, you'll simply have to repair it again.

25th October 2012, 01:42 AM	#1
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Replacing output transistors (mosfets) I have a small punch 55 here and a good set of IRF540 and IRF9540 that I found in my box of parts. Could I use these in it would replacing the other channel? Is it okay if use these in it? With out replacing the other channel it still works. Here's what it says on the fets IRF540 H6 27 IRF9540 H6 31 N __________________ Feel the PUNCH

25th October 2012, 01:55 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it's your amp, you can install used parts. If this is for a paying customer or you intend to sell the amp, order and install new parts. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

25th October 2012, 02:32 AM	#3
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Yes it just my amp for my personal collection, but would it be reliable if I wanted to run it my self? __________________ Feel the PUNCH

25th October 2012, 03:00 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That's impossible to say without knowing what the replacement transistors had been subjected to or their age. The date code may be available in the datasheet but you still won't know how hard they've been driven. If you don't abuse it, they will likely survive. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

25th October 2012, 03:45 AM	#5
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Those mosfets came from a punch 40.2 that I got a whole back it had a blown power supply but none of the outputs were damaged I had used one pair for testing a project amp and left the other two on the board. I wanted to use this punch 55.2 to run a 10" kicker comp single 4 ohm coil sub in a box I'm making. Or use it power speakers. The parts are made by Harris semi because it has the 'H' printed on them. Note: I installed them in and it so far it's playing ok I guess I have connected to some test speakers that are 6 ohms on each channel playing full blast. Reaches what I would consider normal operating temps? Hasn't shut off or anything. __________________ Feel the PUNCH


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25th October 2012, 04:49 AM	#6
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Not gonna get much power out of that amp at 6 ohms stereo bro. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

25th October 2012, 05:48 PM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Well if it works it works. Like Perry said there is no telling how hard the used outputs you installed were driven. It may last a month it may last for years. Put it in your car and run it hard for a few weeks if it does not let you down I think it will be fine. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

25th October 2012, 07:40 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it's your amp and you know how to repair it, try them. If they fail, you'll simply have to repair it again. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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