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Old 3rd March 2010, 06:45 PM   #1
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Default Fun Project Suggestion for a busted NAD2100?

I have a NAD 2100 Monitor Series amplifier that is now dead. Transistors are obsolete and I can't find replacements for a reasonable price.

The transformer and the case are good. Does anybody have any suggestions for a fun project? I'd love to turn this into a tube amplifier but I haven't a clue where to start.
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Old 3rd March 2010, 07:22 PM   #2
paulb is offline paulb  Canada
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If you want to re-use the transformer, check its voltage and go from there.

I used this amp to replace the internals of a high-end Technics Power Amp, and am very happy with it:
Project 101 - High Power, High Fidelity MOSFET power amplifier

Is this what your amp looks like?
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Old 3rd March 2010, 09:10 PM   #3
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Quote:
Originally Posted by paulb View Post
If you want to re-use the transformer, check its voltage and go from there.

I used this amp to replace the internals of a high-end Technics Power Amp, and am very happy with it:
Project 101 - High Power, High Fidelity MOSFET power amplifier

Is this what your amp looks like?
Yup, that's the Amp, I've got!
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Old 4th March 2010, 03:35 AM   #4
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Quote:
Originally Posted by paulb View Post
If you want to re-use the transformer, check its voltage and go from there.
I've got 3 pairs of wires coming from the transformer to the main board.

Impedence Switch Position___4Ohms___8Ohms
----------------------------------------------
Purple_____________________55V_____55V
Blue_______________________85V_____109V
Red_______________________58V_____72V

From that, can you tell if Project 101 would be feasible?

Last edited by seabass23; 4th March 2010 at 03:40 AM.
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Old 25th March 2010, 12:03 AM   #5
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Default any progress on this project?

I have a semi working NAD 2100. I would be interested in knowing what I could throw in there to replace the existing circuitry.

-Charlie
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Old 25th March 2010, 01:58 AM   #6
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I followed paulb's advice and went with a pair of ESP Project 101 amps. The link is above.

I salvaged the case, heat sinks, transformer, input and speaker connectors. The P101 project fits nicely in the NAD box.

I just got all the pieces in the box and did the first stereo test last night. Performance is fantastic so far.

Cost will be somewhere in the range of $200. I would estimate that it took me 20-30 hours (this was my first amp project). I have some electronics knowledge.

Last edited by seabass23; 25th March 2010 at 02:05 AM.
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