USAmps MD22...MOSFET replacement

[Trixter 10+ year member]

The MOSFETs on my MD22 are fried out and I can't find replacements. Can anyone help out? Also, what goes into making it an MD23?

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[Timmothy Web 10+ year member]

got a pic? or do u know what the gate resistors are?

 

[Trixter 10+ year member]

They are labeled as SFP50N06 but I can't find anywhere to purchase them. And I know you can mod this amp into an MD23...figured while I have it apart, and if it's not too much more, I might try that too.

I'll be the first to admit, I know little to nothing about how this all works...electronically speaking. But I can replace and solder in new stuff with no issues. So yeah...not even sure what a gate resistor is, lol.

 

[big bass joel 10+ year member]

try mouser electronics.

 

[hispls 5,000+ posts]

The real trick is making sure nothing else went out that caused or will cause all the MOSFETs to blow up again. Good luck.

 

[Trixter 10+ year member]

I have a feeling I just pushed it too hard. I was trying to substitute it for a 1200w amp that is in the shop. Going to replace the MOSFETs and the CAPs and see what happens.

Thanks for the Mouser hook up Joel!

 

[bubbagumper6 5,000+ posts]

They are labeled as SFP50N06 but I can't find anywhere to purchase them. And I know you can mod this amp into an MD23...figured while I have it apart, and if it's not too much more, I might try that too.
I'll be the first to admit, I know little to nothing about how this all works...electronically speaking. But I can replace and solder in new stuff with no issues. So yeah...not even sure what a gate resistor is, lol.

To be honest, I don't think you have the knowledge to repair an amp properly. You can try, and you may succeed, but don't be surprised if you don't. If it's an amp you don't really care about, go for it, if you really need to get it working again you should send it to a repair shop. When components burn up in a circuit it doesn't generally just fail and turn off, they end up sending enormous amounts of current to other components that may fail or get damaged without showing any signs (i.e. no charring or soot). So there's a very good possibility that you'll burn up all your newly soldered in fets the second you power that amp back up because something else in the circuit is damaged.

 

[Trixter 10+ year member]

Thanks for the concern and I am well aware of all this. I honestly don't expect it to work. I called USAmps/REaudio and they said anywhere between $100-$200 to fix it. So I figured I'd take a whack at it. If it doesn't work I'll try to find someone local.

 

[Spooney 10+ year member]

FQP50N06 would be a good sub if its in the power supply. It's not as simple as changing those fets though in most cases. If its the power supply that went out and it sounds like it based on the part number you gave then there is s good chance there is a failure in the output section too. The outputs will often fail without any visual damage and when they short the amp draws excessive current and kills the power supply fets before the fuses can react. No point in wasting your money if you don't have a decent handle on things to start with.

 

[bubbagumper6 5,000+ posts]

Thanks for the concern and I am well aware of all this. I honestly don't expect it to work. I called USAmps/REaudio and they said anywhere between $100-$200 to fix it. So I figured I'd take a whack at it. If it doesn't work I'll try to find someone local.

Save your money and just take it to someone now. Not only will you waste money on parts, you run the risk of damaging the amplifier further yourself.

 

[Trixter 10+ year member]

All right all right...I call around and see what happens...thansk guys.