Need help with vintage receiver

Discussion in 'Bad Dog Cafe' started by Gardo, Mar 28, 2020.

  1. Gardo

    Gardo Tele-Holic

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    15D93740-EA2C-4057-B88F-A533C68D2A22.jpeg My favorite receiver died suddenly. It’s a late 70’s era Pioneer SX-1050 . It’s worth fixing but now is not the time to take it somewhere with the county on lockdown. It was on fm and sounded fine then just died so I turned it off. Came back to it later and tried it again and it sounded good for a little while then nothing. I opened it up and didn’t see anything obvious .
    It seems to power up but no sound.
    I plugged in headphones a could faintly hear music but didn’t leave it on very long.
    I don’t really know where to look, any ideas?
     
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  2. Buckocaster51

    Buckocaster51 Super Moderator Staff Member Ad Free Member

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    Get your nose in there and sniff.

    Smell anything?
     
  3. Muinarc

    Muinarc Tele-Meister

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    With the age of these things the first culprit is often a capacitor somewhere. The hobbyists tend to take these completely apart and replace all the capacitors.

    Depending on the type, sometimes the transistors will die as well due to age and stress and such.
     
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  4. Gardo

    Gardo Tele-Holic

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    That’s good advice but not noticing any burnt or hot smell
    I do however like the smell of vintage electronics
     
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  5. David Barnett

    David Barnett Doctor of Teleocity

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    Both channels affected equally?

    If so, you're looking for something that could take down the whole amp. I'd look first for a relay or switch contact. Maybe the speaker selector switch or the headphone jack...
     
  6. Gardo

    Gardo Tele-Holic

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    I don’t really want to tear it down more than is necessary and especially don’t want to start replacing random parts
    I may have to wait and take it somewhere when life returns to normal
     
  7. Gardo

    Gardo Tele-Holic

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    A6C3A1AF-3A87-4564-9378-89786E8169ED.jpeg
    Yes ,both channels
    I use 2 sets of 8 ohm speakers and they all quit
    Headphone jack is a good idea
    It does use a couple of these old school relays
     
  8. RLM69

    RLM69 TDPRI Member

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    There are some YT videos on this specific receiver where they discuss restoring it to new specs. Check there.
     
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  9. Gardo

    Gardo Tele-Holic

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    Oh yeah
    YT is a good resource too
     
  10. chet again

    chet again Tele-Afflicted

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    I'd get a can of De-Oxit and spray all the controls. That might help. If not...then a cap job.
     
  11. Gardo

    Gardo Tele-Holic

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    I went to a backup receiver for now.
    The De-Oxit is always worth a try sometimes it works
    I have to get some help with this one
     
  12. chet again

    chet again Tele-Afflicted

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    I said what I did because I don't see any leaking caps in the pics.
     
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  13. Gardo

    Gardo Tele-Holic

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    That’s always one of my go to’s
    I hear the relay click as it powers up.
    There’s a video on YT that clearly shows some voltage checks, that will likely be my next step when I get another chance to work on it
     
  14. tubelectron

    tubelectron Tele-Afflicted

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    I have several Marantz receivers of the same era :

    [​IMG]

    [​IMG]

    Most of them having a loudspeaker relay like your Pioneer, @Gardo. Sometimes this relay becomes defective : you hear it click but there's no more contact. You can open the relay and gently clean the contacts (it's doable on Marantz), but on the 2250B above, I finally replaced the relay by a NOS one found via a Marantz Service Station on the web.

    You can also try to search on the web the service documentation of your Pioneer receiver, if it's not done : it will help you greatly.

    Note : all the caps are original in my Marantz 2015, 2250B, 2270 and 4240, and all these receivers works flawlessly.

    -tbln
     
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  15. Sounds Good

    Sounds Good Tele-Holic

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    I did that with mine sprayed in some wd 40 after not using it much, it is a sansui qrx 9001 quad with the matrix to convert stuff to quad, and i have a sansui 7001 pre amp which i think was the best ever made it really adds some body and volume, also i have one on my modern Arcam 600 surround as well, and it makes that sound twice as good to my mind as well with the lock down i have been playing music alot on them just using with my ipod and a dexim stand.

    Hope you get it sorted i know my quad plays up abit but when is tuned right it is like heaven with the Sansui pre amp which has eq/reverb/ and a multi spread adjuster and with analogue to me sounds just fine.

    I like the old gear alot personally and stay safe everyone also.
     
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  16. Kirchensfan

    Kirchensfan Telefied Ad Free Member

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    I had a 1050 as well...Great receiver...SAVE IT IF YOU CAN! Had it matched with Kenwood 555's, Dual turntable and a Sony 10" reel to reel. Later a Sony cassette dual recorder.
     
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  17. 2HBStrat

    2HBStrat Tele-Holic

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    Good idea!
     
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  18. Gardo

    Gardo Tele-Holic

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    You may have given me what I was looking for . I’ll do some careful investigation
     
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  19. Gardo

    Gardo Tele-Holic

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    WTH a pair of HPM 100 speakers it rocks the house
     
  20. schmee

    schmee Doctor of Teleocity Silver Supporter

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    I love the old Marantz's. Man they are superb. Sold my last one a couple years ago. Still have a 70's Marantz turntable. If they could make a SS guitar amp that sounds as good as those Marantz stereo amps I'd have one.

    So if the Pioneer completely quit, I was thinking it's one of the big output transistors. These are a bit easier usually to get at on these stereo amps as they are on the back for cooling. But, if both channels are gone ....you're likely not be that lucky. Most of these are a nightmare to disassemble to work on.
    My advice is find someone who specializes in those and ship it. ($$) I know there are people who rebuild and sell the Marantz all the time. Check Ebay for "refurbished Pioneer" then ask those guys maybe.
     
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