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pioneer sx-780

  1. axxman

    Picked up an SX-780

    I bought this one from the original owner. Sounds wonderful, looks wonderful, just needs a good cleaning. Owner said he bought it new when he was 16, has never been opened up or serviced.
  2. Brivan

    Pioneer SX-790 with DC Voltage in Left Channel Preamp Audio

    Good morning, fellow AKers. I've got a never-before-seen, unusual problem with about 13vdc in the left channel of the preamp section. This problem started out with a recently as-is purchased Pioneer SX-790 that would trip the protection relay whenever the volume control was moved up (or down)...
    • Brivan
    • Thread
    • pioneer sx-780 pioneer sx-790 sx-780 sx-790
    • Replies: 35
    • Forum: Pioneer Audio
  3. cohwy9

    SX-780 unfound question

    There is a wealth of knowledge here that is incredible! I have searched this form for a specific problem I am having with a Pioneer SX-780 I have recently acquired, but have not quit found a similar scenario to what I am having. I will try to keep this short and concise. If you need...
  4. Oleg LED

    STK-0050 in Pioneer SX-780

    Just bought this Pioneer SX-780 and wondering if those STK-0050 modules are original or not? Is it possible to identify?
  5. cruppr

    Pioneer SX-780 in 1975 Druckers Electronics Commercial

    Old 1970's commercial for Druckers Electronics with a Pioneer SX-780 for $169. Interesting to see how they were discounting them back then.
  6. Bradley J

    Pioneer SX-780 Problems

    Hi all, I was able to pick up a Pioneer SX-780 for $50 today. It does have some issues. It powers on and all the lights come on. The relay doesn’t click on nor does the FM meter move. All the fuses seem to be intact. Any ideas on what and where to start troubleshooting? Thanks so much!
  7. jd2005

    Pioneer SX-780 without a fuse board ??

    Hi, I came across a faulty SX-780. When opening it and looking for the problem, I went straight to check the fuses. - Hey... !!! . Where are the fuses ? Surprise ! - No fuses ?! To my surprise ... there is no fuse board in that unit ! (Fuse Assembly Circuit Board AWR-169 or AWR-171)...
    • jd2005
    • Thread
    • awr-169 awr-171 pioneer sx-780 sx-780
    • Replies: 1
    • Forum: Pioneer Audio
  8. JohnKellysVo

    Advice on testing a classic receiver before purchase?

    Hey gang. I'm a noobie interested in upgrading my stereo rig. I just bought a Pro-Ject Debut Carbon turntable and want to hook it up to something nicer than my ratty JVC RX-2220 "digital receiver." I want to relive the days of my youth, when my father had a Pioneer receiver, with big volume and...
  9. TomTom4049

    STK0050II replacement for STK0050

    This is for those out there who have a sidelined Pioneer SX-780, Kenwood KR-5010, or other nice receiver that incorporates the STK0050 and needs one or two. Yes many STK0050's are Chinese knock-offs of questionable quality so I urge you to simply forget about them. I just replaced both STK0050...
    • TomTom4049
    • Thread
    • kenwood kr-5010 pioneer sx-780 stk0050 stk0050ii
    • Replies: 6
    • Forum: Solid State
  10. grantly

    And...yet another sx-780 restoration thread

    Hi all, I went to an estate sale yesterday on a whim, and I was one of the first few people in the house. There was an incredible Barzilay cabinet with KLH 6s in custom cabinets. Way too much $$$ for me, so I decided to go to the basement. Right at the front was a cosmetically pristine sx-780...
    • grantly
    • Thread
    • pioneer pioneer sx-780 stk 0050 stk amplifier module
    • Replies: 13
    • Forum: Pioneer Audio
  11. Kingbleu

    Pioneer SX-780 need help signal tracing. Powers on no sound. Darlington packs are good.

    I have a Pioneer SX-780 that powers up but produces no sound and no relay click. The STK's (Darlington power packs) are good. I would like some help tracing the signal. I have test equipment that I have picked up over the years. Mostly at garage sales or Craigslist. I have two SX-780's one...
    • Kingbleu
    • Thread
    • no power pioneer sx-780 signal trace stk-0050 sx-780
    • Replies: 78
    • Forum: Pioneer Audio
  12. D

    SX-780 back from the dead!

    In high school I bought a new at the time Pioneer SX-780 receiver with turntable, speakers and cassette tape deck. Halfway through college the receiver began to act up, worked intermittently for a couple years, then quit altogether. After college I bought a Harman Kardon 495i (I'd wanted an...
  13. C

    SX-780 - Counterfeit Darlingtons?

    I have a Pioneer SX-780 that was blowing a main fuse (#4 - 4A I believe). I removed the power wires going to the Darlington outputs, replaced the fuse and the unit powered on and lit up AND the speaker relay clicks. Great, right? So, I went to eBay and bought some replacement STK-0050's ($15...
  14. L

    SX 780 connections broken - help me find out where they go

    Hello, I stupidly removed my rear panel from my SX780 the other day in an effort to open it. I unscrewed two screws right under the phono input and the rec input. These screws had black wire soldered to them and broke off. Now i'm wondering where to re-solder the wires -- I know that one end...
  15. E

    Pioneer SX-780 - Strange Things Happening! (First Post)

    New to site..first post..bear with me. Ok, so a good friend of mine upgraded his receiver so I upgraded my NAD to a Pioneer SX-780. Now this is probably my best friend, and for him money is not an issue, and he's one of those guys with probably $8K invested in his audio set up, with about...
    • ETEXJNB
    • Thread
    • darlington modules equalizer circuit board internal wiring pioneer pioneer sx-780 pre amp riaa
    • Replies: 3
    • Forum: Pioneer Audio
  16. S

    SX-780 Resistors

    I have a project of restoring my SX-780 in which I am in no hurry to complete, just having fun doing so. I am concentrating on my Tuner assembly board first. I got this receiver from someone in Texas, I took a photo of it, notice how dirty the board is, at first I thought that was dust, but it...
    • SargentRicko
    • Thread
    • pioneer pioneer resistors pioneer sx-780 sx-780 sx-780 resistors
    • Replies: 10
    • Forum: Pioneer Audio
  17. Franco989

    Pioneer SX-780 no sound, no second click

    Hi Everyone, I'm having a problem with my pioneer receiver suddenly giving out and not producing any sound. Was working fine yesterday, I did some research on this forum and seams sometimes the cause of the problem is the Darlington Power Packs. I have read the values (see below) but they seam...
  18. T

    Lights up, but no sound from Pioneer SX-780

    when i got home earlier today i went to listen to a record i got in. the receiver was working fine, besides the right speaker was only making a distorted static noise. i then turned the receiver off and checked the wires on both sides. when i turned it back on there was no sound at all. i don't...
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