Jump to content

Pioneer SX1250 Restoration


Recommended Posts

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 Guest
Link to post
Share on other sites

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 Guest
Link to post
Share on other sites

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 Guest
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.

Link to post
Share on other sites
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 Guest
Link to post
Share on other sites

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 Guest
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 .

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 Guest
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

 

Link to post
Share on other sites


Here is a video of SX1250 in action. No dedicated DAC is used in this video as I have sold my Chord 2Qute and looking for something different to try.

 

 

Edited by Guest
Link to post
Share on other sites

Thought of creating a video of this restoration. Couldn't cover all the process in the video. Was able to shoot some clips with the technician to make it different. Check it . .  

 

 

 

 

Link to post
Share on other sites
  • 2 months later...

Update: 

This unit has gone into some trouble. Latter I inspected each board and found extremely poor soldering work and wrong voltages set inside the unit (biasing & voltage stablizer board) by Adrian at Analog Audio Solutions,  Cranbourne North. Also, it looks like wrong replacement transistors he put into the unit. Sourcing the replacement components and soldering work was given to Adrian and he did it in the worst way. It was a waste of time and money.

 

I'm a bit disappointed as it was my favorite solid state unit and wanted to keep it life long. Told him to take care of it like a baby. But it ended up in the worst. All the cosmetic work and cleaning was done by myself except electroplating. When trying to fix,  he made scratches on the copper plated areas also :( .  This is what happens when the unit goes to someone who don't understand the value of vintage gears and how much we love them.

 

Anyway I will get it all fixed properly as I love this unit like anything. Now the unit unit is with someone else to get it checked overall and fix it properly to bring it back to life.

 

Alert : Stay away from Analog Audio Solutions if you love your units.  He has gifted troubles to the units of a few people I know also.

Edited by Guest
Link to post
Share on other sites

Sorry to hear you have trouble finding a Tech that shows respect and care for these vintage rarities. I thought Melb was the vintage capital for caring Tech's. Thanks for the thread and the heads-up...

Finding a tech you can trust in SYD is impossible...to get my SX sorted!

Link to post
Share on other sites
22 hours ago, EDGEAUDIO said:

Sorry to hear you have trouble finding a Tech that shows respect and care for these vintage rarities. I thought Melb was the vintage capital for caring Tech's. Thanks for the thread and the heads-up...

Finding a tech you can trust in SYD is impossible...to get my SX sorted!

Melbourne has got some really good techs. But this person was very near to me and all the good techs whom I already know where too far in the other end of the city. 

 

This person setup his business few months back only, said he was working with another firm in Pakenham before and decided to start his own business. Sure, I was one of his first very few customers. Initially I gave him some small jobs and small units. There were some signs of poor knowledge about vintage units...the whole electronics itself. But its my bad, I failed to analyse him well from those incidents, lesson learned. Also I referred few of my friends also to this person and now most of their units are also in trouble, few of them got lucky.

 

Anyway, this unit is in safe hands now and I will get it done properly.

Link to post
Share on other sites
  • 8 months later...
  • 4 months later...
On 15/08/2020 at 2:32 AM, Ulysses59 said:

No mention of the transformer being electroplated. How did you manage to do it?

What a beautiful  piece of legend you own. Congratulations. 

Sorry for the late reply. The transformer and old capacitor cans are not electroplated, it is just copper finish paint.  All other metal parts in copper colour are copper plated. 

Link to post
Share on other sites

Received my SX1250 back after fixing the issue. While replacing the transistors in power stabilizer board the previous tech put low voltage wrong ones and it kept blowing.  

Anyway the second tech did an amazing job even though it was a long wait for me.  He has gone through all the work done by previous tech again, fixed bad soldering done by him and also cleaned the switches by dismantling them.  

 

Here is videos of the unit singing today... :) ... Now its in better than brand new condition....

 

 

 

 

Edited by Guest
Link to post
Share on other sites
  • 4 weeks later...
On 04/01/2021 at 12:05 AM, hkc said:

Absolutely stunning rebuild mate! Just beautiful 

 

Thankyou 🙏

Now its a keeper... It sounds stunning and in perfect condition, will keep going for another 30 - 35 years.. :)

 

Link to post
Share on other sites
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By barryj46
      Item Condition: Used Shipping Options: Pickup available but audition is not available. Suburb or Town: BIBRA LAKE State: WA Payment Method: Cash, EFT, Paypal Reason for selling: Upgraded Further information:  Classic Japanese made 7.1 Channel AVR.  120 Watts per channel in surround mode and 160 watts per channel in stereo mode.  Has been used regularly in stereo mode as it sounds very musical in Pure Direct mode.
       
      Comes with paper manual, two remote controls and set up microphone.
       
      Photos:
       
      PLEASE READ
      If you include any reference to pricing whatsoever in this section (excluding RRP), your ad will not be approved If you are advertising multiple items, you must post one bulk price only, or post seperate ads for each item If you don't include photographs of the actual item being sold, your ad will not be approved You understand that a reasonable donation for selling fees is expected upon successful sale of your item
      - if you have previously sold items and not made a donation, your advertisement may not be approved.



    • By Vintage_Hi_Fi
      Item Condition: Used Shipping Options: Pickup available and you can audition. Suburb or Town: Melbourne State: VIC Payment Method: Cash, eft, PayPal Reason for selling: No longer required I’m selling a lovely vintage Pioneer SA-8500 MK-II Stereo Amplifier.

      Made in Japan

      240v model

      Dual transformer design - The sound signature is typical Pioneer of the period sporting a wonderful analogue experience 

      Specifications below thanks to www.hifiengine.com

      Power output: 60 watts per channel into 8Ω (stereo)

      Dimensions: 420 x 150 x 376mm

      Weight: 13.9kg

      The amplifier works as it should on both channels and on all inputs - bias is set to factory spec and the amp has had all its electrolytic capacitors replaced excluding the original power supply capacitors. All controls have been cleaned for smooth and quiet operation. Original NEC output transistors in place.

      Presented in very good cosmetic condition with minor imperfections in line with its age - the lid has some surface rust and serial number engraved I was going to get this powder coated but opted to keep original to let the new owner decide to leave it or have it repainted to their desired colour.

      Overall presents very nice but most importantly sounds wonderful.

      Melbourne pick up only due to the size and weight of this amp

      A donation will made to stereo net post the sale





    • By patjoy
      Item Condition: Very Good Shipping Options: Pickup available but audition is not available. Suburb or Town: Melbourne (Northern Suburbs) State: VIC Payment Method: Cash on Pickup/EFT Reason for selling: NLR Further information:
       
      This vintage Pioneer SX-750 receiver is from the iconic period of silver faced receivers of the 70s. I am the original owner from 1976.
       
      When released it was an upper mid range receiver putting out a solid 50 watts per channel at 0.1% total harmonic distortion. Heaps of features including a nice phono. The performance of the SX-750 is not that far off from the flagship SX-1250 with the exception of power output.
       
      It is in very good condition for its age with a just a few very minor marks and tiny lifting of veneer. The casing appears to be a couple of mm off which I’m sure can be adjusted. The photos clearly show the receiver is in very good condition.
       
      Specifications:
      Power Output: 50 wats per channel into 8ohms
      Two tape inputs/outputs
      Duplicate switch
      Phono input
      Aux/mic inputs
      Tone & High filter switches
      FM muting
      Tuning & Signal meters
      Bass & Treble controls
      Dimensions: 480x149x371mm
      Weight: 13.7kg
       
      As I don’t have the box this Receiver is Pickup Only, sorry.
       
      Photos:

    • By Yobots
      Item Condition: Used but mint Shipping Options: Pickup available but audition is not available.,Shipping is available at agreed cost. Suburb or Town: Bulimba State: QLD Payment Method: PayPal cash on pickup Reason for selling: Down sizing house Further information:
        The Pioneer Kuro PDP-LX508a needs no introduction. Downgraded house since moving and don’t have big enough room for this. Picture is still perfect and rivals the latest OLED TVs without the price tag!  Comes with original packaging for the tv, pedestal and speakers.  Including original manuals etc. 
       
      more info on request but a quick google search will show you what you need to know on detailed specs. 

      Photos:
       
      PLEASE READ
      If you are advertising multiple items, you must post one bulk price only, or post seperate ads for each item If you include any reference to pricing whatsoever in this section (excluding RRP), your ad will not be approved If you don't include photographs of the actual item being sold, your ad will not be approved








    • By 943
      Item Condition: Used, very good Shipping Options: Pickup available and you can audition. Suburb or Town: Canberra State: ACT Payment Method: Any Reason for selling: No longer required. Only use 2 channel now. Further information:
       
      https://www.trustedreviews.com/reviews/pioneer-sc-2022
       
      7.2 Class D amplification
      7 x HDMI in
      1 x HDMI out
      Apple AirPlay
      App control
       
      I have all accessories, manual and remote. Also have the original box which is in poor condition (the kids got to it) but no internal packing. 
       
      AVR has been lightly used and in storage for the past 18 months and works perfectly. 
       
      Pickup or I could deliver in ACT. 
      Photos:
       













×
×
  • Create New...