Question about NAD T973 Amplifier
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 Both 22,000uf electrolytic capacitors have been replaced by Mundorf Mlytic HC high current electrolytic.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
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
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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