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Pioneer SPEC-1 Restoration

xoaphexox said:
Ahh that is what I was afraid of. Would there be any sonic benefit to recapping the ones I can find and leaving the rest alone or is that just a pointless exercise?

Luckily I was able to find all the values I needed for the Sansui CA-3000. I really like the way that turned out so I was thinking I would do it to the SPEC-1 but I can live with it the way it is.

Thanks, Mark - always a lifesaver with Pioneer!
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I thought you were spending the time because you knew something I didn't...

about the only factors I can think of for these caps is dielectric adsorption, and for that I don't think there's a lot of difference between mylar and the polys, while the other factor is construction - i.e. stacked film versus rolled construction with a small amount of parasitic inductance affecting the impedance - but my "kneejerk" on that is that it is at a significantly higher frequency than the audio range and will not affect it.
 
xoaphexox said:
Continuing the restoration of several Pioneer pieces. Tonight I finished the SPEC-1.

1. Replaced electrolytic capacitors >3.3uF with Elna Silmic II / Nichicon Muse FG/KZ / Panasonic FC depending on where they are used
2. Replaced caps <=3.3uF with WIMA MKP polypropylene caps
3. Replaced stock diodes with Fairchild Stealth super fast soft recovery diodes
4. Replaced every fuse
5. Reflowed every solder joint
6. Stripped and cleaned chassis with ammonia free windex and Mother's chrome polish
7. Replaced MY4 relay and reed relay with new units
8. Deoxited controls
9. Replaced 8v incandescent power lights

It went really smoothly - only the SPEC-4 unit to restore before my entire rack is complete (see thread http://audiokarma.org/forums/showthread.php?t=263724).

I have been at this for two months - I have never heard SPEC gear before - I am excited to see how it compares to a restored Sansui CA/BA-3000 rack and a Kenwood 700M/700C rack!

:music:
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What Reed relay you use to replace the asr-005 (75-10)
 
AK search Spec II by “mattsd”. It’s in that thread.
I have a Spec II thread too with it in there.
Same, similar mod and reed relay.
 
Liubovjean said:
No. The original it’s a dual Chanel 24v
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I had an SX-1050 that uses the same relay and mine was bad too. Was lucky enough to find a couple of them back then.

What I used was an Electrol reed relay that are impossible to find. Had to modify it to make it fit.

I don't know what Zeb used but will look some more.

IMG_20210309_093452874.jpg

IMG_20210309_100130832.jpg
 
kwayde said:
I had an SX-1050 that uses the same relay and mine was bad too. Was lucky enough to find a couple of them back then.

What I used was an Electrol reed relay that are impossible to find. Had to modify it to make it fit.

I don't know what Zeb used but will look some more.

View attachment 3587171

View attachment 3587176
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I round this on eBay. I thing î’ve got it….
 

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