Question about NAD C370 2-Channel Amplifier

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No problema

Posted on May 26, 2008

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NAD C370 distortion

Check first if you got +68/-68V on amp module left and right on contact CZ302 and CZ402 pin 2 & 7. Often the -68V is missing. This is caused by faulty transistor Q713 in +68/-68V power supply. It's a 2SA872.

Oct 31, 2013 | NAD C370 2-Channel Amplifier

3 Answers

NAD C370 distortion.

It looks like you may shorted some part of the audio circuitry, Most likely you will have to replace the entire board (easier option).

If you can find a replacement board, it shouldn't be too hard to replace, if you have had prior experience with electronics. However,i think it is best you let an experienced electronics repair guy do this for you.

hope that helps..

May 25, 2008 | NAD C370 2-Channel Amplifier

2 Answers

Nad c370 keeps switching off

Check the speaker wiring for shorts, a common problem. If everything checks out there may be bad solder joints on the main board especially in the output stage, or there is a fault in one or more driver transistors.

Jun 02, 2012 | NAD C370 2-Channel Amplifier

2 Answers

My NAD C350 do start when turned on but 2 seconds then it turns red. Doesn't help to disconnect the speakers or turning off soft clipping. What to do?

C350 i have today fixed one a 49 capacitors replaced because the blue JH capacitors are most of them bad (if you have a no-lie capacitor meter) you can measure the difference .
the most blue 10 uf 25 volt replace for new and also the 47 uf and 25 volt ones there are also some modifications to do there is one place with a small black ic there are 2 capacitors on and one of them is 33 uf 50v change to a radial elco 47 uf 100v position is C146 and the other capacitor is 4.7 uf 50 v to replace for the same or higher voltage , in this days the c350 is an older amplifier and knowing that the most capacitors are have most 63 v as the littlest to get in shops so its always to have enough voltage tolerance on the capacitors and the format size is the same as the old 25 volt ones of the used capacitors from the early years 2000 . special the Korean made ones have had much problems.

Replace all old blue old JH capacitors they are deformed and are not self-healing anymore. to wait sometimes one hour to get from the protection mode is not the way for the Amplifier.
Also the gread purple NAD capacitors those can internal rattle like a baby rattle old and dried as the ones you see on the picture . the only 2 jh capacitors that are good on the amp i repaired where on the volumepotentiometer .
The other brands little elco's 50V can maybe have a longer health but this on the picture are all the JH ones and are replaced that i today have repaired that amplifier is now in good condition again. i have token simply philips 2200uf 63 volt to get that amp first working again , and that was what it does now later maybe F&T capacitor 2200uf 63 v after a while for little better sound.
But a good capacity meter is necessary with no lie detection because a simple meter will not have a secure range, there is also a 560 ohm resistor that must changed for 560 ohm but a 2 watt type (fusable) position R227
On the bridge cells there are ceramic capacitors used c511 until c513 that 3 must be replaced by polyester film capacitors 100nf /100 volt i have used 3 axial ones
Change D309 and D310 from 1N4148 to 10M Ohm 1/6W 5% Metal Film Resistor to get a better balans on low volume .
Maybe you will find the next modification already or not
Change R401 and R402 from 2.2 Ohm/2W to a jumper wire
Then beware to do a very secure soldering of every component because a soldering failure with adjacent components is easily made. and sometimes difficult to find it back.


Oct 03, 2010 | NAD C350 2-Channel Amplifier

2 Answers

Knob for NAD amp?

try your "local" NAD seller and ask them?
Contact NAD by email.

100's of users someone there should be able to help.

Jan 11, 2009 | NAD C370 2-Channel Amplifier

1 Answer

No power at all on NAD C370

User manual here

Read page nine for some simple troubleshooting tips and see if that helps.

It *could* be a fuse but given you've owned it for a while and NAD amps often have capacitor issues in the power supply, chances are it needs some serious work by a good tech. Contact NAD directly and see what they recommend.

Dec 29, 2008 | NAD C370 2-Channel Amplifier

1 Answer

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.

Nov 04, 2008 | NAD C370 2-Channel Amplifier

2 Answers


This could be as simple as a bad connection at the voltage regulator IC or blown output transistors. If you have a multimeter and some experience with electronics repair, this should be fairly straightforward.

Let me know and I'll try to walk you throught the repair.

Sep 07, 2008 | NAD C370 2-Channel Amplifier

1 Answer

NAD C370 Right channel distortion

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

Aug 29, 2008 | NAD C370 2-Channel Amplifier

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