SX1980 Power supply board ...... OH NOOOOOOOO!!!!

Discussion in 'Pioneer Audio' started by kevzep, May 14, 2017.

  1. kevzep

    kevzep Its all about the Music Subscriber

    Yeah, I think it would have been a bad move to slap the front back on and hope the switches would be all good.
    We all know by this time (some 40 years after birth) these switches need the full dismantle service, and I am so glad I did it.....
    It really is running well, we had Dire Straits Love over Gold cranking today, punching up around 200watts plus in the peaks in Private Investigations.....
    The sound was really really impressive......

    I taped my temp probe onto the bottom of the unit, where the vent is right below the AWR-154, and the hottest it got under there today was 22.1˚C......So I am pretty happy with that...

    QRX was easy, dodgy LED (front illumination), and the rotary source selector switch, the shaft has no glue holding it from sliding out (maybe too much deoxit)....So I engineered a bracket to prevent the shaft from being able to slide out.... Yeah, there are a lot of wires, pass-throughs, and boards everywhere.....I'm glad I didn't have to pull the board the switches are mounted on, worse than any Pioneer I've seen.....

    Lamps still haven't turned up, oh what a shame, I'll have to spend all day listening to the SX-1980 again!!.:yikes:
     
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  2. Aaron99

    Aaron99 AK Subscriber Subscriber

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    What else can you tell me about your test load. Is it home built? Is it wirewound resisters in water?
     
  3. kevzep

    kevzep Its all about the Music Subscriber

    The jugs are full of water, the jug elements are wired in parallel which makes 7.9Ω. Job done.....I do have another 480watt load which is 8 x 60watt 4Ω resistors in series parallel (out of a very old computer mainframe power supply of all things), I run guitar amps and the likes into that one simply because it has a 1/4" Jack cable on it.....The electric jugs have a banana plug.....
     
  4. kevzep

    kevzep Its all about the Music Subscriber

    The Lamps turned up, Warm white LED. So this brings me to the end of the job on this wonderful SX-1980, I was really pleased with the way it came out and it was nice to spend some time this last week listening to it, I have always wanted to hear one, and now I have, and extensively.
    Here's some shots of the lighting from the LED's, I really like it, makes the unit look very sharp. I was always an advocate for keeping things as original as possible and using incandescent bulbs, I didn't like LED lighting to start with, but now the LED technology has really come along and LED's are excellent now...
    IMG_4657.JPG IMG_4658.JPG IMG_4659.JPG
     
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  5. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    Damn it!... Now I want a SX-XX80... Agreed on LED:thumbsup:
     
  6. kevzep

    kevzep Its all about the Music Subscriber

    It's too late for me.....I'm a gonna!! Hahaha.......There's a SX-1980 on my horizon I can see it now.....
     
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  7. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    Bunch of enablers! :rflmao:
    Come little XX80:naughty:.... Come!:naughty:
     
  8. kevzep

    kevzep Its all about the Music Subscriber

    Yeah thats pretty much it......There's a SX-1980 on the bay for restore, unfortunately its a domestic USA model so no good to me down here where we are 230V.....
    I need to get an export model.....Booooooo....
     
  9. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    that's too bad
     
  10. kevzep

    kevzep Its all about the Music Subscriber

    There will be one out there somewhere, definitely consider a SX-1280 too......
    Enablers is right!!
     
  11. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    A SX1080 or 1280, will do it for me, but I haven't seen one local.:smoke:
     
  12. petehall347

    petehall347 the brandy coffee man

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    fix the 110v and do a swap for a 230v one. :D
     
  13. kevzep

    kevzep Its all about the Music Subscriber

    Ditto, either way I'll be having to acquire one from the USA and have it shipped here.....I might put a WTB in Bartertown, see if that brings me anything....
     
  14. kevzep

    kevzep Its all about the Music Subscriber

    Actually thats not a bad idea Pete....
     
  15. petehall347

    petehall347 the brandy coffee man

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    at least our variacs will go to 110v no problem . are you on 50 or 60hz ? just thinking about transformer heat .
     
  16. kevzep

    kevzep Its all about the Music Subscriber

    we are 230VAC 50hz +/- 6%...
    I could use a step down, I own other 120V gear...but they are pre-amps so not really an issue, I don't really want to run such a powerful amplifier on a stepdown if I can avoid it...
     
  17. kevzep

    kevzep Its all about the Music Subscriber

    and just to remind us......:yikes: Oh noooooo.........
    IMG_4657.JPG
     
  18. petehall347

    petehall347 the brandy coffee man

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    made me think because i have had for many years a very large american rv 12v power supply unit . i have never bothered trying it as i know it will run too hot .. shame really as good do with using it .
     
  19. kevzep

    kevzep Its all about the Music Subscriber

    I think for small appliances you can get away with it no problems. Once you're into much bigger power transformers I think thats when you'll have issues...
     
  20. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    ohhh1.jpg
     

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