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Replies

  • dario

    Member • Dec 31, 2013

    Hi, I've got the same problem with ah500-7 head. 2SK3590 n-channel mosfets are shorted and when I tried to replace them, they blow up immediately. I suspect the cause is TND 501, but I can't get datasheet or find an alternative. I'm looking for schematic of the amp too, but until now nobody has it! Please if you solve this problem, help me!!!
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  • Jeffrey Arulraj

    Member • Jan 10, 2014

    Can you post a little more like the current readings around the Mosfet?

    Is there any readings of voltage and some circuits that you tried out? If so pls post them as only then we can see and find the cause of failure
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  • dario

    Member • Jan 11, 2014

    Since I found schematic, I've done some measures on circuit. The supply circuit is made in this way: 230Vac -> transformer -> rectifier -> filter caps (Vcaps 110Vdc) -> switching stabilization (half bridge configuration) with setpoint 85-90Vdc. The trouble is in the switching stabilization or in its analog control. I don't know the exact sequence of events that destroy this circuit. A simple solution is: bypass the switching stage, so Vcaps will supply directly the power amp ( a voltage ripple can be tolerated in my opinion ). Obviously mosfets and all part that supply driver have to be removed. This is the faster way since hb driver replacement can't be found!
    Thanks Jeffrey for your interest!
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  • Jeffrey Arulraj

    Member • Jan 11, 2014

    That was great that you solved the issue I think the current input to the driver is beyond critical, But with out the circuit diagram I am helpless in checking that out

    But its a pleaure to hear that you have solved the issue on your own
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  • Wiggyjnr

    Member • Nov 16, 2015

    Hello, I have the same issue with the TND-501 in a Trace Elliot 1215 500w combo. I've managed to fond a circuit diagram (attached as a .pdf). How exactly can I get around this problem without throwing the amplifier away? Jeffrey, your advice would be much appreciated here!
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  • Wiggyjnr

    Member • Dec 1, 2015

    Hello again, is anybody able to help with this or should I give up and sell it for spares?
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  • Radan Malbašić

    Member • Dec 25, 2015

    I could be wrong but I'll try TND501 replaced with IR2110S, I have nothing to lose, amplifier is certainly incorrect, and of course I will never buy a Trace Elliot amp.
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  • Wiggyjnr

    Member • Jan 19, 2016

    Hi Radan

    How did you get on with the ir2110s?

    Did it work?

    Kind regards

    Dave
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  • Richard Vroman

    Member • Dec 13, 2024

    Hi, I have the same problem now, Did some one have succes repairing this amp? Did it work to replace the tnd501 with the IR2110S ?

    regards, Richard

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