MTX TA7801 repair

[intensem1rider]

I just replaced it. Same scenario, it heats up to 105 degrees F.

[Perry Babin]

I don't know what else you can do. The 5532s run hot but they shouldn't run that hot. It may survive as it is.

[intensem1rider]

Ok, well i'll run it hard and see what happens. Im crossing my fingers that either it will be fine, or if there is something else wrong that's causing the current draw/opamp temps, then then I hope that part will blow so I can find it

Thanks for your help!

[kennyycc]

Im having problem on my MTX TA7801 which the amp has no problem hitting the bass out but once I turn off the REM, it start to discharge and making some noise to my woofer.
I've been troubleshooting it for couple of month but still can solve it.
Anyone here can help?

[Perry Babin]

If you disconnect the RCA cables from the amp, does it make the same noise?

[kennyycc]

Yup. Disconnected the RCA also produce some noice when turnning off. I have try to change the processor board from other TA amp. The result also the same.

Currently, im trying to check is there a discharge circuit for this amp.
Will there be possible also the JFET controlled the Optocouple failed?

Ahhh...so many possiblity which I don't know where to start.

[Perry Babin]

The JFET isn't likely defective.

Does LED400 go off immediately when the remote voltage is removed?

[kennyycc]

Yes. LED400 light when normal operation....and imeadiate OFF when remote turn ON is removed.

[barddas1]

I have a MTX TA7801 that doesn't work have fets 104,106,108,110,112 all burned beyond idenification as well as FETS 103,105,107,109, and 111 broken in half but appear to be a marked n520ak. Does anyone know what these fets are and where I could purchase them?

[Perry Babin]

There should be other numbers on the FETs. Start a new thread and post the other numbers on the FET.

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