How different is the Nakamichi PA-7 from a Threshold Stasis? - diyAudio
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Old 5th May 2010, 09:59 PM   #1
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Default How different is the Nakamichi PA-7 from a Threshold Stasis?

I recently picked up a pair of Nakamichi PA-7's. I'm very impressed with the performance from these units, and plan to keep them for quite a long time.

A couple of questions:

1) How similar is the PA-7 compared to the Threshold Stasis amps of that vintage?

2) What restoration steps should be undertaken to the PA-7 to ensure long trouble free life?
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Old 5th May 2010, 10:04 PM   #2
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1) It was largely a copy using their own part #'s.

2) New electrolytic caps.

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Old 5th May 2010, 10:15 PM   #3
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Quote:
Originally Posted by Nelson Pass View Post
1) It was largely a copy using their own part #'s.

2) New electrolytic caps.


New caps it is. Thank you sir.

Since the original power supply caps are no longer available, I take it values that are close would work?
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Old 5th May 2010, 10:57 PM   #4
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Correction to my last (D'oh!)

I found the power supply caps online. They are still available.
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Old 8th May 2010, 07:51 PM   #5
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Quote:
Originally Posted by Redwingnine View Post
What restoration steps should be undertaken to the PA-7 to ensure long trouble free life?
In addition to the caps, while you are at it, you might consider replacing the rectifiers and the bias controls.
This is what Jon Soderberg did on mine a couple of months ago, and I am very pleased with the results. I imagine most of the improvement came from the caps however.
Just a suggestion from a non-professional.
And thanks to NP for everything.
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Old 8th May 2010, 08:58 PM   #6
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Quote:
Originally Posted by kzim229 View Post
In addition to the caps, while you are at it, you might consider replacing the rectifiers and the bias controls.
This is what Jon Soderberg did on mine a couple of months ago, and I am very pleased with the results. I imagine most of the improvement came from the caps however.
Just a suggestion from a non-professional.
And thanks to NP for everything.

Yes indeed, thanks to NP is in order.

Thanks for the feedback. My buddy (who is very accomplished at restoration work) and I will get together to sort out what the best way forward. I think in general, the rectifier setup will be updated with HEXFRDs. Most, if not all, of the caps will be replaced as well.
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