Question about NAD C370 2-Channel Amplifier

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Output on one speaker goes on and off

My Nad C370 sometimes drops out on one of the speakers. It can then come back on again after a while. It happens on both A+B speakers. I have tried turning the speakers around (left into right) (right into left) but it is still the same? Happens with all inputs Any help would be appeciated, Otherwise information on someone around the Blackburn area who could fix it?

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 4234 Answers

SOURCE: Nad C370

Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

Posted on Nov 05, 2008

Grubhead
  • 5020 Answers

SOURCE: NAD C370 Right channel distortion

Sounds like you have lost the power amp transistor(s) or IC for this channel.

Posted on Feb 16, 2009

smarthome2
  • 1114 Answers

SOURCE: NAD 302 PHONO STAGE

Reverse your RCA input around and see if the problem follows, this will determine if the problem is in the turntable output signal or the preampsection of your amp. If it stays on the same channel, slightly move the RCA that's dropping out signal around. If the signal cuts in and out, you know it's just a weak solder joint on the input rca of the amp. If it does not change, your problem is deeper. Chances are it's a "cold solder joint" on the input section of the amp and would only be a labor type repair and no parts involved. That can be a double edged sword as well depending on how long it takes to find it. If you have to have it serviced, find a local shop that's been around a while, they are likely to be a little more insightful as to the exact problem quicker. Hope this helps

Posted on Jun 26, 2009

Ganx
  • 113 Answers

SOURCE: nad c372 problem with left speaker output

Hiya, did you try to swop the inputs as well and see if the problem swops. Try that as the input could also be low. If so try change the cable.

If not there try cleaning out the balance pot with switch cleaner (have to open to that and only you are comfortable).

If thats not there then likely an internal problem and will have to send it in.
Best of luck

Posted on Jul 14, 2009

  • 7 Answers

SOURCE: myc370amp turns its self about 15seconds after turn on

Replace 3 capacitors on the protect printboard. (located near the outpt terminals) 50V electrolyt: 4,7uF, 47uf and 10uF. And move the big diode to the back of the printboard (the heat from the diode dries out the capacitors)

Work in 9/10 times ;)

Posted on Aug 17, 2009

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Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

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regards
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