Jump to content

Sign in to follow this  
HiFi-Man

Pioneer SX1250 Restoration

Recommended Posts

Posted (edited)

Was lucky to find this unit locally in Melbourne few months back. Tested all functions and found everything working good.  Inspected the unit inside by removing the covers to see in what condition the components inside. I can see few leaky caps..power filter capacitors are leaking badly. Almost all light globes needs to be replaced. Got amazed :o to see the huge 1.2 KW toroidal transformer and four 22000uf 80v power filter capacitors. Wooden cover came with all scratches. But it came really well after giving a light sanding and applying bee wax. 

 

Checked the DC offset and found to be low which is safe. Hooked them to my Tannoy Ardens. This is a unit which really surprised me with its wide ..deep sound stage and sweetness in sound. 

I'm slowly moving to valve and selling all my solid state units ... but decided to restore this unit to experience the full potential of the unit.

 

Anyway the restoration work started two weeks back.... Pictures attached here are before taking it for the full restoration... 

Will update more details, progress and pictures here...  any suggestions, advice from pioneer experts most welcome.

 

20190816_103621.thumb.jpg.fa99d663b4cada4a4295aa8e46abad64.jpg

20190816_103546.thumb.jpg.726753c78b541e60533ed9026976d35b.jpg

20190816_103627.thumb.jpg.83561af45351f19cd987cf04463d7b86.jpg

20190816_103644.thumb.jpg.1b9260be54e04add1854076a300933f8.jpg

 

 

Edited by HiFi-Man

Share this post


Link to post
Share on other sites
Posted (edited)

All covers,  power filter capacitors,  toroidal transformer,  circuit boards are taken out. The chaisis needs a good clean.

 

All metal parts in first photo will get copper plated. :)

 

IMG-20190816-WA0018.thumb.jpg.0a187802e902cc26f373b23f08842483.jpg

IMG-20190816-WA0015.thumb.jpg.8de37a81286d69bf2c693049df28693c.jpg

IMG-20190816-WA0016.thumb.jpg.d9aa10867a0c5194e8af257c4bc22494.jpg

IMG-20190816-WA0014.thumb.jpg.38e13b9c9f1d57c8c8605463ffd839a1.jpg

 

 

Edited by HiFi-Man

Share this post


Link to post
Share on other sites
Posted (edited)

The base of the big power filter capacitors is cut and open. Got them empty to use them as a cap for the new caps. They are aluminum and will get copper plated. 

 

Cleaned the capacitor covers nicely. It takes approx one hour plus to cut,  open,  empty and clean one capacitor can nicely. It needs further sanding using ultra fine paper and probably buffing before electroplating copper.

 

 

20190827_114648.thumb.jpg.1fccd807ec29e60838d96b58a45076bf.jpg

Edited by HiFi-Man

Share this post


Link to post
Share on other sites


What a nice rebuild. I've never seen anyone go to the trouble of electroplating the metal components before. Do you work in the electroplating business?

Should look fantastic with all that shiny copper everywhere. Some nichicon fine gold caps would look nice in there with the copper parts as well.

Share this post


Link to post
Share on other sites
Posted (edited)
4 hours ago, lemarquis said:

Interesting read here on this model. 160 W RMS! 

 

http://thevintagehifishack.com/197677-pioneer-sx-1250/

 

Good luck with the work and interested in the outcome. :popcorn:

 

Thanks. Yes, It believed to be one of the best unit ever made and preferred by many over other exotic models/brands. Both SX1980 & SX1250 share the same power transformer of 1.2 KW. I think SX 1980 was made to compete in the power race during those days where as SX1250 is built for music :) .

 

4 hours ago, niss_man said:

What a nice rebuild. I've never seen anyone go to the trouble of electroplating the metal components before. Do you work in the electroplating business?

Should look fantastic with all that shiny copper everywhere. Some nichicon fine gold caps would look nice in there with the copper parts as well.

 Thanks :) ... Same, I have never seen a restoration with electroplating metal parts. When I did restoration of my Marantz 2325 this was the only thing which I didn't do. This idea came into mind only after finishing restoring it, still that restoration drained my pocket.

 

No, I'm not working in the electroplating business :)  hehe. But a good friend of mine who is familiar with electroplating is happy to help me with it.

There are two reasons why I have gone for electroplating copper (especially tuner board covers) .

i) This unit deserves a better look together with its sweet sound.

ii) Electromagnetic shielding,  will be amazing if it helps to improve the sound anymore on this unit. ( here is an interesting read https://en.wikipedia.org/wiki/Electromagnetic_shielding )

     

Edited by HiFi-Man

Share this post


Link to post
Share on other sites
Posted (edited)

Few of the copper plated metal parts are ready. Need to give them good clean. Considering some coating on top of this to prevent oxidation and it should maintain the same look. (There is some light reflections in the photos)

 

20190829_180706.thumb.jpg.168c9c0c6f241866faec3101584453cb.jpg

 

20190829_180728.thumb.jpg.75031596d8d553264cf09fca1026be7e.jpg

 

Edited by HiFi-Man

Share this post


Link to post
Share on other sites


Finally almost everything got finished on this SX1250. Got busy with work and this restoration job, so could'nt update the progress here for last few days .

All the electronic work is done by Adrian at Analog Audio Solutions, Melbourne. Gone for Elna Silmic ii in 95% of the places to replace electrolytic caps. 

Power filter capacitors used are from Nippon Chemi-Con 22,000uf / 80v x 4. Will post photos here..

 

Next thing pending is the Speaker connection binding post upgrade on the unit and a huge round sticker on top of the toroidal transformer with Pioneer logo.

Edited by HiFi-Man

Share this post


Link to post
Share on other sites


20190908_065454.thumb.jpg.b46d50b865548b7ecf82a4b9dad193de.jpg

20190907_072635.thumb.jpg.953e92217d5493b4c58669a839550eac.jpg

 

 

The wedge shapped big LEDs are Amber colour which I found that is giving yellowish colour tone like incandescent globes in room light.  But its a bit orangish colour in dark room.  

 

 

In room light

20190908_201802.thumb.jpg.b32af45f0c7f75c74d6ea9d1117baa30.jpg

 

 

Without light in room.

20190908_200756.thumb.jpg.91c27de3d43f080717b51eca746f5df9.jpg

 

Share this post


Link to post
Share on other sites


Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By jmone
      Item:  Pioneer Kuro LX-608a
      Location: Sydney (Near Chatswood)
      Price: $400
      Item Condition: Good Working Order - Purchased as part of the Original Group Buy.
      Reason for selling: Moved to 4K equipment
      Payment Method: Pickup Only - Cash, Paypal, COD Only
      Extra Info:  Includes the Stand, Remote, and Speakers (Never Used, still in box).  I've not used it in about 6mths thinking I could deploy it elsewhere, but turns out it is just gathering dust.  It has been working without issue for it's entire life, and if anyone is keen I'll power it up and take some more photos or you are welcome to inspect.
       
      Photos: Advertisements without photos of the actual item will not be approved.

    • By Jasperthecat
      Item: Pioneer TV SPEAKERS PDP-S60
      Location: Mount Colah Sydney NSW 2079
      Price: $40.00
      Item Condition: Brand New in box - never used
      Reason for selling: not needed
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info:
       
      Photos: Advertisements without photos of the actual item will not be approved.



    • By afireinside
      Item: Monitor Audio Bronze 2 and Pioneer SX10AE
      Location: Diggers Rest, VIC 3427
      Price: $450
      Item Condition: Used - Excellent
      Reason for selling: downgrading
      Payment Method: Pickup - Cash, Paypal, COD Only
      Extra Info: Prefer to sell together but will seperate only if both are sold ($300 speakers, $150 Amp), price is firm.
      Come with all pictured accessories, no boxes so cannot ship. Can include some 12g speaker wire if sold together.
       
      Photos: 


    • By zakblue
      Item: Pioneer S424X Speakers
      Location: Balwyn, Vic
      Price: $50 
      Item Condition: Good, used
      Reason for selling: NLR
      Payment Method: Pickup - Cash, Paypal, 
      Extra Info:
       
      A little bit dusty. Need some TLC. 
      Stands not included.
       

       
×
×
  • Create New...