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Old 8th August 2003, 05:41 PM   #1
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Question Nad 310 Amp

I have just gotten a Broken NAD 310 AMP From a friend
When I opened it I found that the BUZ555-60B
are Missing

So I went on to Check the rest of the Transistors (with a Multimeter) to find that all of them look fine

The PROBLEM is I can't find the BUZ555-60B anywhere if South Africa.
So is there onother component I can Substitute for the BUZ555-60B

or is there a way to tweaking the circuit to work with anothe Component?

I have never seen a Bipolar & FET output stage!

Pleeeese HELP!
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Old 8th August 2003, 05:48 PM   #2
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Post NAD 310Amp

Here the Amps Shcemetic!

http://steve.sky.net.ua/Audio/semi/A...p.gif:bigeyes:
Need Replacement of the BUZ555-60A

or Tweak to make amp work!
http://steve.sky.net.ua/Audio/semi/Amp/NAD/310amp.gif
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Old 8th August 2003, 09:12 PM   #3
UrSv is offline UrSv  Sweden
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You can substitute it with an ST type STP30NE06L according to:

http://www.repartout.com/Datasheets/...enceMOSFET.pdf
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Old 9th August 2003, 08:19 PM   #4
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Thanks Help Much Apreciated!!!

Will Keep U Posted On Progress!!!
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Old 9th August 2003, 08:30 PM   #5
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Opps I forgot here is the link to the Schemetic

http://steve.sky.net.ua/Audio/semi/Amp/NAD/310amp.gif

Plese help!
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Old 11th August 2003, 10:12 AM   #6
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STP30NE06L Can't Find That One Either!
Is There Any More You Guys Can Suggest
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Old 13th August 2003, 09:00 AM   #7
rmgvs is offline rmgvs  Netherlands
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Default hoe does it work?

About 5 years back I owned a NAD 310. When I took the lid of the amp I was really surprised by what I saw. To begin with it is a amp with a asymmetrical power supply and a output-capacitor in the signal path. This was common practice in the sixties but never seen again since then (the Audio Innovations Alto is the only exception that I know of). Was this done deliberately?

Further I only saw one big transistor per channel upon the heat-sink, alongside a much smaller one. Could this be a single-ended transistor amplifier? No, because it is not working in class-A at all. And the brochure says the amp gives 80 Watts per channel at 2 Ohms: this would mean a massive standing current. But a push-pull amplifier with one big and one small transistor in the output stage?

I gave up understanding it because I had no schematics. Now I have the link for the schematics and will have a look at it (did not yet study it).

Has anyone looked at the schematics and formed an idea what the philosophy of this amp is?

Strange also the the brochure or any test that I read at the time do not mention the characteristics of the design.

Rudy

By the way: the amp did not sound very special to me. The old NAD 3020 (same price and still in my possession) was a better performer in my opinion. After listening to it for several weeks, I upgraded the power supply (bigger rectifier and caps) and gave the amp a higer bias current. It sounded better after that time.
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Old 13th August 2003, 11:06 AM   #8
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Thanks UrSv & rmgvs for your help
Really Apreciate It!

I now think the Amp is not worth the Wake Up!

I have already built the P3A from Elliot Sound Products
and it Sounds Great! so I can use it to amplify!

Question! again
Is there a way I can use the Pre-Amp of this Amp


where can I steel the Audio before it is fed into
the Power Amp Stage?

here the link to the pre Amp
http://steve.sky.net.ua/Audio/semi/Amp/NAD/310pre.gif

I was thinking just before R201 &202
Will This Work?
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Old 13th August 2003, 12:59 PM   #9
rmgvs is offline rmgvs  Netherlands
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Default pre out

About using the preamp seperately:

If you unsolder the resistor R 201 from the circuit and take the signal from the wiper of the volume pot (where it is connected to the R201 resistor) you have your preamp.

In effect the output signal from the preamp is blocked by a electrolytic cap (47 mF) and goes straight to the volume pot.

Is not often seen that the pot is at the output of the preamp.

Now the output impedance is not a constant but depends on the position of the volume pot. Besides that the pot is of value 20k which is rather low for some applications. As long if you use very short cables (1 meter typically) between pre- and main-amp it looks that you got yourself a nice and cheap preamp.

Rudy
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Old 14th August 2003, 07:17 AM   #10
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Default Re: pre out

Quote:
Originally posted by rmgvs
About using the preamp seperately:

In effect the output signal from the preamp is blocked by a electrolytic cap (47 mF) and goes straight to the volume pot.

Is not often seen that the pot is at the output of the preamp.

Now the output impedance is not a constant but depends on the position of the volume pot. Besides that the pot is of value 20k which is rather low for some applications.
Rudy
Should I then Replace the POT(20K) to higher value?
it is going to be used as part of a Hifi system wich I'm Still building
what value should it Be?

when you say the output signal is blocked by a electrolytic cap
does that mean I have to bypass it?
If so which one is it (can you give me its number accoding to the schemetic)

Thanks for helping me out
Still Learning
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