Hi guys was wondering if someone could help me here does anyone know if the 65n06's were the original fets in this MTX Thunder 5400X or what would be a good replacement?
also this amp has irf540 for outputs from what I can see they look original
also this amp has irf540 for outputs from what I can see they look original
Thanks Perry after looking things over I discovered there was also 2 shorted ssp45n20A in this amp so I assume someone was previously in this would irf9640s work for the outputs in place of the 540's to match the 3205's similar to a Memphis amp I assume there would be some modifications required
The 9640 is a P-channel. You cannot replace an N-channel with a P-channel transistor.
The SSP FETs are used in the class D amp channel. The IRF540s would be used in the class AB amp channels.
You should know that the class D amps in these amplifiers can be difficult to repair because there are several components that leak (electrically). The board can even become conductive. Add to that that the original FETs are no longer available and substitutes may be difficult to find. If the rail voltage is less than ±70v in the class D amp, the IRF3415 may be a good sub (maybe).
The SSP FETs are used in the class D amp channel. The IRF540s would be used in the class AB amp channels.
You should know that the class D amps in these amplifiers can be difficult to repair because there are several components that leak (electrically). The board can even become conductive. Add to that that the original FETs are no longer available and substitutes may be difficult to find. If the rail voltage is less than ±70v in the class D amp, the IRF3415 may be a good sub (maybe).
I see i guess you pretty much answered that one Perry when the sub section of the amp is running the irf3250's it appears there causing the amp to slightly pulse the power led not much but it pulses just a hair doesn't completely dim out the light think i might beable to use some of those ssp's out of a mtx 81000D i have laying around i am pretty sure there the same numbers i know there ssp's
After messing with the controls the amp runs the 4 channels awesome and theres no pulsing I am wondering if maybe the sub drivers are blown that's why I have no sound with the subwoofer just the slightest buzzing sound when messing with the sub gain
Looking at the board for a similar amp, the original FETs in the power supply were the STP60NE06-16.
Unless you're going to scrap the 81000, I'd suggest trying the IRF3415s in the class D section of the amp. Any drivers that have solder connections that appear to have heated up will likely have to be replaced.
Unless you're going to scrap the 81000, I'd suggest trying the IRF3415s in the class D section of the amp. Any drivers that have solder connections that appear to have heated up will likely have to be replaced.
big thanks Perry
you wouldnt by anychance know the location mtx put the drivers in these amps or similar amps to these would you ?
also what part # they original used in these for drivers ? theres tons the same is why i ask
you wouldnt by anychance know the location mtx put the drivers in these amps or similar amps to these would you ?
also what part # they original used in these for drivers ? theres tons the same is why i ask
i am wondering if they would be the bjt right next to the irf540 on both sides of the fets on the heatsink would you think the drivers should be PNP?
yes thats correct Perry i was just hoping to get the 5th channel working or at least try the amps in good shape so would be nice to have the 5th channel working
Why were you asking about the drivers for the 540s? They have nothing to do with the class D amp?
looks about right perry if not exact thanks a bunch now i know what location too look into if they are pnp bjt do you think the bjt bd140 would work ok if i install the 3415 fets
The BD140s may not be able to handle the voltage for every transistor in that group. It's possible (but unlikely) that the only problem is shorted output transistors (if you found that any were shorted).
There isn't a 1-size-fits-all driver. You need to determine if there is a bad transistor. If there is, try to find an exact replacement. If none is available, you then look up the datasheet and try to find a suitable replacement.
I am really not as good as you Perry i don't really have a catalog in my head of possible choices my choices are limited considering i am still learning and limited knowledge of different brands of amps out there but hopefully they will be available
Also special thanks to you Perry if it wasn't for you with all my Memphis amp repairs i wouldn't have 3 working Memphis 4KW mojo amps all your help is very appreciated
Also special thanks to you Perry if it wasn't for you with all my Memphis amp repairs i wouldn't have 3 working Memphis 4KW mojo amps all your help is very appreciated
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