Nakamichi PA-7 and PA-5 amps - diyAudio
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Old 24th April 2010, 02:13 AM   #1
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Default Nakamichi PA-7 and PA-5 amps

Hello all,

New to DIY audio.

I just picked up a pair of PA-7's and a PA-5 for use with the music and HT rig. I recently picked up a pair of Legacy Signature III's for the front, and a Legacy Silver Screen for the center channel. Will be using Polk LSI 15's for the rear speakers.

I am really impressed with the sound of the Nak amps. I've been told that they are basically the same as Threshold amps.

Can someone provide some more background? Thanks!
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Old 24th April 2010, 02:24 AM   #2
john65b is offline john65b  United States
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They are both Stasis amps designed by Nelson Pass...while not class A, still very good amps...

I made three attempts to purchase, but just never could get my hands on one. The PA7 MKII is the one to get...
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Old 24th April 2010, 02:27 AM   #3
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What is the difference between the orignal and the Mark II? Is that something that could be done as a DIY effort?
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Old 24th April 2010, 04:31 AM   #4
jam is online now jam  United States
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I would go with the Mk1. I believe that Nakamichi scewed with Mr.Pass's original design in the Mk2 and it does not sound as good despite better distortion numbers.

Jam
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Old 24th April 2010, 04:38 AM   #5
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Quote:
Originally Posted by jam View Post
I would go with the Mk1. I believe that Nakamichi scewed with Mr.Pass's original design in the Mk2 and it does not sound as good despite better distortion numbers.

Jam
Thanks, Jam.

As it turns out, I have obtaind 2 PA-7's and 1 PA-5 (MK1).

I did see a thread where Mr. Pass had designed an updated driver board for the PA-7. I might look at that to see just what the update does.

So far, I really like the PA-5. It's a great amp, with lots of reserve power and excellent control of the bass drivers. I can't wait for the PA-7's to arrive next week.
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Old 25th April 2010, 03:12 PM   #6
jam is online now jam  United States
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Default All things must Pass

Redwingnine,

Send me an e-mail. I think I have a copy of the service manual if you want.
I believe that Mr.Pass scored a winner with the Stasis output stage which in my humble opinion is far better than most traditonal topologies. I used to have a PA-7 which still rivals most contemporary designs. I am sure a few mods would turn it into a giant killer..........bummer, I should have kept my PA-7.....like all Mr.Pass's designs it stands the test of time.

Regards,
Jam
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Old 28th April 2010, 10:52 PM   #7
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Thanks, Jam

ROGER WILCO
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Old 29th April 2010, 05:03 PM   #8
jam is online now jam  United States
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You should post pictures.

Jam
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Old 29th April 2010, 06:20 PM   #9
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Quote:
Originally Posted by Redwingnine View Post
I did see a thread where Mr. Pass had designed an updated driver board for the PA-7.
I don't recall doing such a design.

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Old 29th April 2010, 11:20 PM   #10
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Quote:
Originally Posted by Nelson Pass View Post
I don't recall doing such a design.

Oops!

Here is the thread has has a drawing of it:

What speakers to pair with Nakamichi PA 7 - AudioKarma.org Home Audio Stereo Discussion Forums
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