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sx780

  1. B

    SX-780 High Voltage on STK-0050 Inputs

    Schematic: hfe_pioneer_sx-780_ku_kc_schematic_en.jpg Service Manual with Board Layout: http://akdatabase.com/AKview/albums/userpics/10007/Pioneer%20SX780%20Service%20Manual.pdf As a foreword, I'm not very advanced at troubleshooting electronics, but I gave it my go and would appreciate if...
  2. C

    Intermittent Phono?

    This is related to another thread I posted about some issues I was originally having with my turntable. I've been trying to weed out this problem on and off for a while but have recently really started to get work done to solve it. The problem I'm facing is that the left channel (always left) on...
    • Colin M.
    • Thread
    • audio issue interimttent pioneer sl1700 sx780 technics
    • Replies: 15
    • Forum: Pioneer Audio
  3. T

    Pioneer SX 780 Power Transformer voltages

    Trying to troubleshoot a sx780. Lights up but stays in protection. Trying to swim upstream. No voltage readings on schematics for secondary side of transformer. 30v from red wires but 0v from white and brown outputs. White goes to capacitor assembly, brown to pin 21. Can anyone tell me what...
  4. B

    Pioneer SX-780 restoration

    Hello, I have a question about an sx-780 I want to fix up. A little background on me, I've done some tube radios, both AM and one AM/FM. I'm familiar with basic soldering/desoldering, recapping, and limited troubleshooting. Use (in series) an isolation transformer, variac, and dim bulb tester...
    • breadtimesam
    • Thread
    • pioneer receiver solid state stereo sx 780 sx-780 sx780 tuner
    • Replies: 1
    • Forum: Pioneer Audio
  5. Z

    SX-780 issues fixed now distorted sound

    Title says it all. I had an issue with the Darlington packs one of them blew out because of my stupidity one of the wires touched for a speaker connection. Lesson learned... After reading several threads on this site about replacing them, testing for resistance, so on and so forth, I decided to...
  6. S

    Vintage Speakers - and Pioneer SX780

    Hello all, First post - patience. I've been running a Pioneer SX780 for some time now, love Pioneer SX series. However, my speaker knowledge base often gets overrun with too many options. I want to run an A/B setup to play both, or just A depending on situation. Budget isn't a huge issue...
    • scutland
    • Thread
    • ads ar speakers klh 17 klipsc klipsch pioneer sound system speakers sx780
    • Replies: 13
    • Forum: Speakers
  7. guille go

    Pioneer sx780 noisy right channel

    Hi, this is my first post I will try to be clear with what I am going to write, there are people who know a lot here. I have a pioneer sx780 that I think was never repaired, the capacitors are original elna(all). the right channel started to make random distortions, when it starts to "heat up"...
  8. DiegoV

    Attempting to resurrect my old Pioneer SX-780

    Newb here. I’ve had an SX-780 since 1985 that I purchased from the original owner. I had it serviced twice to replace STKs. I believe the right channel was replaced both times because the left channel STK looks original. Regardless, any replacements were done in 1990 or before. It has not been...
  9. SicMan

    Pioneer fans STK0050

    I found these replacement bds searching the Bay for those parts. I have no affiliation to this. PS: did anybody try these yet...
  10. Spotopolis

    Looking to possibly Frankenstein 2 pairs of bookshelfs into a single pair

    I have a pair of Aiwa SX-780's and a pair of MCS 683-8224-20 (2-way) speakers. They have been sitting in the garage for about 2 years or so. I picked them up on CL a while back for cheap. The foam and speakers are good, but I believe the crossovers need some work. I hooked them up when I first...
    • Spotopolis
    • Thread
    • 8224 aiwa diy frankenstein mcs rebuild sx-780 sx780
    • Replies: 6
    • Forum: DIY
  11. Markansas

    SX780 Receiver purchase advice

    Hi, Markansas here, new to AK. I still have the PL400 TT I bought new in 1980, but my SX780 receiver is long departed. I have seen them on eBay for around $200, which I think is a fair price (about what I paid for my SX780 new), but have some trepidation about spending that kind of cash on an...
  12. Rebel

    Is there any suitable replacement for STK0050's

    I have read many threads concerning this but I have yet to find a straight answer. I have had mine replaced professionally and they last 6 months. I am a novice and can do the work but I need a recommendation of a GOOD part. Can someone tell me what is a solid suitable replacement for these?
  13. T

    SX 780 Repair help.

    So I have had a good clean sx780 for months now and I love it. I moved recently and set it up and it worked fine. I noticed awhile ago that the stk 0050 was going for the right channel but it was still working at the time. After a few days, it made a pop and shut off. I took it apart and noticed...
  14. Thisiscobras

    Pioneer SX 50 series vs SX 80 series vs SA series

    I realize a similar question was posted a few years ago I just wanted to try and get some refreshed opinions. I recently made the "upgrade" from an SX 780 to an SX 850 and I find myself actually missing the sound of my old 780. Of course I like the apparent build upgrade of the 50 series and...
  15. Germ_nation

    SX-780 losing left channel

    I acquired this receiver about a month ago and immediately opened it up and did a deoxit cleaning. The past couple days I have started to lose the left channel. At first I thought it was just happening through the phono but now it's starting to happen on the aux also. It sounds like static or a...
    • Germ_nation
    • Thread
    • pioneer sx-780 sx780
    • Replies: 6
    • Forum: DIY
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