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Old 6th September 2005, 01:02 PM   #1
bra is offline bra
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Default Nak PA7 clone

I think it is time to start new thread.
Maybe someone want to clone great Nakamichi PA7?
I do. I have service manual but I have to scan.
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Old 6th September 2005, 01:26 PM   #2
Cobra2 is offline Cobra2  Norway
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Default interesting

I always wanted this amp...!

Arne K
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Old 6th September 2005, 01:39 PM   #3
jmateus is offline jmateus  United States
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Default New amp

Bra
Bring it on, scan it and publish it, we are all anxious to see new amplifiers, enough of those beaten ones in other threads.
Thanks
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Old 6th September 2005, 03:39 PM   #4
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Interested
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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
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Old 6th September 2005, 06:03 PM   #5
bra is offline bra
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Guys scan will be tomorrow!
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Old 7th September 2005, 12:10 AM   #6
oPossum is offline oPossum  United States
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Cool Schematics

Amplifier (one channel) 362k TIFF

Power Supply 156k TIFF

Unfortunately I only have a rather poor quality copy of the service manual, so some of the text is not readable.
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Old 7th September 2005, 12:50 AM   #7
anatech is offline anatech  Canada
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Thanks oPossum,
That's the beast. There is still the mod PCB for the current limiter we need to find.
If the text were more clear .... Can you scan the main PCB to give others an idea of the size? 14 outputs per channel doesn't seem to convey the idea like a picture.

-Chris
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Old 7th September 2005, 12:55 AM   #8
anatech is offline anatech  Canada
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You know, I'd like to have some input from N P on this. Maybe not his design, but it's his concept. Nelson may have some cool ideas.

-Chris
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Old 7th September 2005, 01:20 AM   #9
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This design has a characteristically poor HF PSRR so you will be listening to PS artefacts so best to eliminate those half wave Class AB ones in the most inelegant way possible - by wasting power running such a monster in Class A.

This type of dinosaur will be the first to go in the dawning of the new era of energy efficiency. RIP.

Cheers,
greg
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Old 7th September 2005, 01:36 AM   #10
anatech is offline anatech  Canada
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Hi Greg,
Have you had a chance to hear or test these amps? Just curious.

What you say might be true, but they sound very smooth. The front end looks well isolated from the supplies. No worse than many others and better than some.

The outputs were run warm because they are not in the feedback loop and needed to be run in a more linear part of their curves - Stassis you know. I can think of a few other amps that ran at least as warm as a normal A/B with everything in the feedback loop.

True, they are not as efficient as most other amps, I'll give you that.

-Chris
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