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Old 5th April 2005, 06:12 PM   #21
ash_dac is offline ash_dac  United Kingdom
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Hi,

Just turned amp on. It did the popping thing but it also did a new thing!

(distorted sound for about 20 secs)

Sounds ok now


Regards,


Ashley.
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Old 5th April 2005, 06:21 PM   #22
Giaime is offline Giaime  Italy
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Strange things goin' in those NADs, ain't them?

Also mine does the popping. The original owner said it has always done that. Mine is a 3020 "Series 20", 1983 I think.

I bet both of us have offset problems, and luckily I have found on the service manual that the offset is adjustable.

That distorted sound could be due to a misfunctioning transistor, but I now believe more in cracked solder joints than before.
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Old 5th April 2005, 06:30 PM   #23
djk is offline djk
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"I bet both of us have offset problems, and luckily I have found on the service manual that the offset is adjustable. "

Ever heard of 'barking up the wrong tree'?

NAD uses single ended stages.

Even if both V supplies came up and down together (wishful thinking) there will be a point at which things power up and down that are not symetrical.

If you want it quiet, buy a DIY add-on relay kit.
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Old 5th April 2005, 09:15 PM   #24
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I have an NAD T761 receiver that was popping on turn-on. Fortunately it was under warranty, so I sent it back to the manufacturer. He said it was a faulty cap in the turn-on delay cct.

I've used NAD amps for many years, at first in my main system and now in a secondary system. They sound more powerful than their power rating, and they are very musical. Worth keeping if you can get it fixed for a reasonable price.
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Old 5th April 2005, 11:18 PM   #25
anatech is offline anatech  Canada
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I wouldn't go hunting for one. There is better product out there.

Before you comment - fixed them for years & still run into them.

-Chris
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Old 6th April 2005, 12:43 PM   #26
Giaime is offline Giaime  Italy
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Quote:
Originally posted by djk
[B]Ever heard of 'barking up the wrong tree'?

NAD uses single ended stages.
No. If I understand you well, you're wrong, since my NAD uses a complementary output stage, based on 2N3055 and MJ2955. I'm quite sure about this
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Old 6th April 2005, 03:45 PM   #27
Bull is offline Bull  United Kingdom
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Marantz are nice amps!!!!

PM17MK11 is a very nice Marantz amp.

Would certainly beat the NAD by far.
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Old 6th April 2005, 11:28 PM   #28
djk is offline djk
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"No. If I understand you well, you're wrong, since my NAD uses a complementary output stage, based on 2N3055 and MJ2955. I'm quite sure about this "

The outputs are are not the issue, the front end design is.

I would define 'single ended' to be like the ESP 3A, and 'complimentary' to be like a Leach.
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Old 6th April 2005, 11:34 PM   #29
anatech is offline anatech  Canada
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Yup, NAD has a single ended input stage. This is inherently going to give a DC offset that will drift more than a standard diff. pair.

-Chris
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Old 7th April 2005, 01:26 PM   #30
Giaime is offline Giaime  Italy
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Ah. Didn't understand that you were referring to the input stage. Of the poweramp?

Can someone enlighten me about the difference between SE and a differential pair in the input stage? I'm not an expert in SS amps...
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