Question about NAD T973 Amplifier

3 Answers

Nad t973 Help! My nad t973 blew one of its 22000uf electrolytic capacitors the other week. I am having a lot of trouble locating a replacement. Can anyone please advise me on where i may find the replacement. I notice one of the 15000uf capacitors is showing signs of failure so would like to replace all of the filter capacitors. There are two of each of 22,000 and 15,000 both 80 volt and rated at 105 degrees. They are also both 35mm diameter.

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  • sparklessd May 26, 2008

    Thanks for your advice but the capacitance values are correct. They are the ripple filter capacitors used on the power supply directly after the full-wave bridge rectifier. The 22,000uf capacitor actually exploded and the 15,000uf capacitor is swollen- a clascis sympton of a failing electrolytic.



    I will try the supplier you suggested and again thanks for trying...

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3 Answers

I have finally repaired the NAD T973 by a fair modification. Both 22,000uf electrolytic capacitors have been replaced by Mundorf Mlytic HC high current electrolytic. This involved relocating the relay power supply board to the side of the Torrid transformer. Then relocating the Torrid transformer slightly to the left of it's original position. The existing 15,000uf capacitor relocated to the RHS of the lower 15,000uf Capacitor. This gives sufficent room for the very large Mundorf capacitors to be mounted into the amp. One is mounted onto RHS of transformer enclosure and the other to the front panel. The caps are then cabled to the associated copper bus pads.

The result is an awsome improvement to the lower frequencies and mids. The highs seem unchanged. The quality of the Mundorf caps exceeds the original NAD caps and are rated at 100volt.
They are expensive, however, at $ 100 Australian each.

With an amplifier of this quality it worked out cheaper than the $670.00 Aus. quoted by an authorised NAD dealer.

Posted on Jun 19, 2008

  • Tony Numan Aug 07, 2013

    Hello there! I am having the same problem with capacitor 22,000uf, 80v. I would like to ask you why you had to replace four of them instead 2 of 22,000uf, 100v only. Thanks! Tony

  • Donal Kavanagh Sep 19, 2013

    Hi Tony. I didn't have to replace all four capacitors but did as noticed the 15,000uf capacitors were swollen and showing signs of failure. I didn't want to risk futher damage to other components. It is now 5 years since I did this repair and the amp hasn't missed a beat. It is also used daily too, so I am a very happy chappy....

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I done a lot of electronic repairs over the past 30 years or so. This is something I haven't seen very much of. I wonder if
it might have been run on too high a mains voltage or something. You should check other parts like rectifiers and
output transistors also. There is Mouser, another one is
MCMElectronics, Digikey perhaps. Mouser offered free shipping
and good prices along with most things in stock the last time
I used them. I have no affiliation, just a customer. That's a good
amp, it should be worth fixing. Good luck with it.

Posted on May 26, 2008

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Well, the values are much more likely, 2200 and 1500 microfarad, you might check on how many zeros there really are. Also, how do you know they are failing?

It is likely they are not failing unless
they are much older than 30 years. Sources of parts include
Mouser Electronics (www.mouser.com). There are many
sources. Knowing the correct value of the part, of course,
helps significantly. I think you might be off by a zero.

Transistors and diodes are a more likely suspect of failure. Even
these parts are quite reliable unless overloaded, then they tend to short circuit.

Posted on May 26, 2008

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