sx 1500 td

Discussion in 'Pioneer Audio' started by john stumpf, Mar 17, 2017 at 5:15 AM.

  1. john stumpf

    john stumpf AK Subscriber Subscriber

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    im getting one of these. ive looked but ive not so far been able to find a recap or recommended replacement parts list for this set. anyone here can point me in the right direction?
     
  2. Awesomeaudio

    Awesomeaudio AK Subscriber Subscriber

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  3. blhagstrom

    blhagstrom Mad Scientist, fixer. Subscriber

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    They don't show up much so not a lot of documented restoration info is available.
    1971-1973 puts it in the "old" school vintage pioneer class.
     
  4. john stumpf

    john stumpf AK Subscriber Subscriber

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    very in formative and i do thank you. my problem is im an electrician with an ancient board repair degree from AMRIP. looking for a list if possible as im not sure whats in the signal path and whats ideal for those locations. im smart enough for the power supply and proficient in deoxit and thats as far as it goes although i do know how to test a transistor and use a quality fluke meter.
     
  5. zebulon1

    zebulon1 Into Phase Linear's lately Subscriber

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    Is the receiver working?
     
  6. Awesomeaudio

    Awesomeaudio AK Subscriber Subscriber

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    The link I provided. There is a member by the name HVHIFI (Mike is his name). Contact him as he has restored one and may still have a cap list.
    Otherwise if the unit is ok then don't worry about a resto if it doesn't need it.
    If and when you get it, power it up on a DBT first so things don't go snap, crackle and pop then go from there.
     
  7. Awesomeaudio

    Awesomeaudio AK Subscriber Subscriber

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  8. john stumpf

    john stumpf AK Subscriber Subscriber

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    dont have it yet its arrival should be in 2 wks. i cant access those links altho i do have a scematic and service manual at this time. i was trying to get information before its arrival and collated. not sure at all how to get a PM to HVHIFI. i do thank you all for your replies.
     
  9. blhagstrom

    blhagstrom Mad Scientist, fixer. Subscriber

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    99% of the time I make a list by eyeball.
    I do have my own stock so I can usually do 90% of a recap before ordering.

    Using Mouse.com, search capacitors, pick electrolytic and choose the uf and V and way over on the right set the filter to audio grade. Click the "stocked" box and apply filter. It will bring up all audio grade and just use those outside the power supply. They should be mostly Elna and Nichicon in the available stock.

    I buy what's in stock since backorder takes forever.

    FWIW, any new cap from a place like Mouser or Digikey of the correct uf and V is worlds better than the tired old Stone Age caps that are in there.

    You may need to drop the audio grade setting for axial caps. For those, I like Sprague.

    Hand picking the bestest cap to fine tune gear that old is an art and that gear was mass produced at lowest cost so I really wonder about trying to perfect it. All the parts in it are a little worn.
     
  10. john stumpf

    john stumpf AK Subscriber Subscriber

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    i also have a lot of caps and transistors from past projects and probably have most of what i need. as i perused the component lists i noticed a lot of mylar caps whats "word" on those?
     
  11. john stumpf

    john stumpf AK Subscriber Subscriber

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    to answer zeb's query,no sound left channel.low sound right channel so it does do something
     
  12. petehall347

    petehall347 the brandy coffee man Subscriber

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    check the fuses . each main amp channel has its own fuse .
    then check centre voltages .
     
  13. john stumpf

    john stumpf AK Subscriber Subscriber

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    be glad to pete,when it gets here.what are centre voltages?
     
  14. blhagstrom

    blhagstrom Mad Scientist, fixer. Subscriber

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    Mylars are stable. Rarely ever replaced and only after a lot of trouble shooting to find a mystery problem.
    99.99% safe to ignore them.
     
  15. john stumpf

    john stumpf AK Subscriber Subscriber

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    i forgot to mention "styrol" are they in the same league as mylar's?
     
  16. petehall347

    petehall347 the brandy coffee man Subscriber

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    centre voltages are the voltages at the collectors on one of the output transistors for each channel . the other output transistors are at rail voltage . centre voltages are roughly half of the rail voltages .
     
  17. john stumpf

    john stumpf AK Subscriber Subscriber

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    thanks pete we will be talking in a couple of weeks
     

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