Pioneer SX-780

Discussion in 'Dollars and Sense' started by WhatsAAudio, Apr 16, 2018.

  1. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    Theres a person in my area selling a Pioneer SX-780 (I'm not affiliated with the seller in any way) on craigslist and I love how the classic Pioneers look but, sadly, I have never listened to one. He says that he'd sell it to me for $120, is that a good price for this receiver?
     

     

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  2. ivandezande

    ivandezande Super Member

    Messages:
    1,439
    Location:
    Twin Cities
    eBay says yes, keep in mind the broken power arm that you'll have to replace, among probably some other restoration.
     
  3. rkgren1

    rkgren1 Well-Known Member

    Messages:
    958
    Location:
    Yorktown, VA
    Ebay 'Completed Sales' is your friend for this type of inquiry.
    It is truly current.
    Markets go up and down.
     
  4. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    That's true, what other restoration should I take into account? (Minus the cleaning and such)

    Good point, I was just seeing if other people enjoyed how it sounds/thought it was worth it.
     
  5. ivandezande

    ivandezande Super Member

    Messages:
    1,439
    Location:
    Twin Cities
    Power supplies on Pioneers are known for getting much too hot, I think this is an affected unit. Someone correct me if I'm wrong.
     
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  6. Pioneered

    Pioneered Well-Known Member

    Messages:
    719
    Location:
    Hurricane, UT.
    I don't claim to know everything and I could very well be wrong but, if he were close to me I'd go pick it up.
    For a well working model I think that's about 1/2 price or less not counting the speakers with the deal.
     

     

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  7. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    I'll just liquid cool it (joking of course), is there any way to remedy it or is it a, replace ASAP kind of thing?

    I appreciate your humbleness and are the speakers worth picking up too? Since I know much less about the speakers listed.
     
  8. Pioneered

    Pioneered Well-Known Member

    Messages:
    719
    Location:
    Hurricane, UT.
    I don't know much about the speakers either, I just thought it was a package deal.
     
  9. ivandezande

    ivandezande Super Member

    Messages:
    1,439
    Location:
    Twin Cities
    Rebuild the power supply. In visibly hot areas, replace resistors to a higher wattage, and replace the transistors with new and bigger heatsinks. Recap with 105 rated caps, Nichicon PW/VZ or Panasonic FC/FM would all work great.

    Speakers are all crap or eh except the KEF's.
     
  10. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    Ah, so do that right when I get it? Or wait until I see how it performs. Also, thank you all for answering my questions, a nice welcome to the community.
     
  11. ivandezande

    ivandezande Super Member

    Messages:
    1,439
    Location:
    Twin Cities
    Would be best to do ASAP, before more damage is done. No problem, happy to give advice. Hope you buy it and enjoy it.
     

     

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  12. EastPoint

    EastPoint Factory Code No. 4200 Subscriber

    Messages:
    4,413
    Location:
    Milwaukee, WI
    The 780 specifically suffers more than average.
     
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  13. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    Gotcha, I'll pick it up then and do the power supply rebuild! I also saw some people recommend reflowing the solder on some of the joints?
     
  14. ivandezande

    ivandezande Super Member

    Messages:
    1,439
    Location:
    Twin Cities
    Yup, the power transistors get so hot the joints can form cracks.
     
  15. EastPoint

    EastPoint Factory Code No. 4200 Subscriber

    Messages:
    4,413
    Location:
    Milwaukee, WI
  16. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL

     

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  17. Lavane

    Lavane AK Subscriber Subscriber

    Messages:
    6,937
    Location:
    northern cal.
    Nice sounding, good looking. I found a very clean one for $13. It works fine, but I also know I will need to replace some parts in the power supply and add at leased one heat sink on a regulator along with reflowing some solder joints. But for $13 I was all in. I just passed on one for $30 with bad solder joints. I did post it here for others to see. That being said mine is working fine after all these years as is so far.
     
  18. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    Gosh what a steal, and placing heatsinks on the regulator is a normal thing I'm assuming?
     
  19. rkgren1

    rkgren1 Well-Known Member

    Messages:
    958
    Location:
    Yorktown, VA
    Of the 10 vintage receivers that I have bought, I sold one, gave another way, continue to use one as-is, have another two in the queue for eventual repair, and I refurbished the other five.
    All five needed the work, and sounded much better after getting it.
    That receiver does not look like some pampered cream puff.
    I would expect it to need extensive work, and then hope for a pleasant surprise.

    Having someone do the work for you is not a viable option if you weigh repair costs against post-rebuild resale value.
    The 780 (and most of the x80-series) has integrated power amplifiers that must be replaced as units, and are difficult to find.

    I would not buy this receiver without carrying a set of small speakers / headphones with me to assure myself that both power amps are working properly.
    Without clean sound on both channels I would walk away and find another, nicer unit in excellent condition.

    1970s Pioneer receivers are not hard to find.
    I bet a WTB post to Barter Town will turn one up very quickly.

    Earlier Pioneers did not rely on the integrated power amps.
    The SX-x50 series look very similar, but without the black power meters.

    HiFi engine has docs: https://www.hifiengine.com/manual_library/pioneer/sx-780.shtml
     
  20. WhatsAAudio

    WhatsAAudio New Member

    Messages:
    10
    Location:
    St. Petersburg, FL
    Good point, I've been contemplating subscribing for the Barter Town, and maybe I will, since you're bringing up a lot of good points, especially with the state that it's in.
     
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