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sx-737

  1. YoSeth

    I'm a noob - SX-737 Rebuild (follow along?)

    Ok, so not a total noob. A few years ago I successfully replaced all the 2SA725s and 2SC1313s. Decided to carry on and do a full recap since nothing else has ever been touched. I purchased the recap kit from eBay and opened her up today, starting with testing the output transistors per the kit's...
  2. spctrlhrmny

    SX737 Control Amp capacitor discrepancy

    Hey there. Attempting my first receiver rebuild on a Pioneer SX-737, and I am preliminarily checking components on the boards to the specs in the manual before I start testing, purchasing, and repalcing. Ran into an issue on the control amplifier assembly board. Specifically, C1 + C2 and C23 +...
  3. spctrlhrmny

    Pioneer SX-737 project...capacitor ID needed on control amp

    Hey there. Attempting my first receiver rebuild on a Pioneer SX-737, and I am preliminarily checking components on the boards to the specs in the manual before I start testing, purchasing, and repalcing. Ran into an issue on the control amplifier assembly board. Specifically, C1 + C2 and C23 +...
  4. bzenic

    Dull Sound From Pioneer SX-737

    I recapped my Pioneer SX-737 a while ago and apparently it works okay, all switches function. The problem I have is a very dull sound, without brightness and transients when playing FM. It is connected to SONY ss-cs5 speakers with upgraded 1 mH coils in the CO. I can tell the difference when...
  5. R

    SX-737 lost 90% output after toggling tape monitor

    Hey everyone! Long time reader, first time poster. Let me start by saying I have only a very little experience in audio repair. However, I’m typically a pretty capable and handy guy. I recently picked up a new to me pioneer tape deck and wanted to try it out so I hooked it up to my SX – 737 and...
  6. zeferinoj

    SX-737, AWR-058, correct caps?

    Hello! I'm working on an SX-737's AWR-058 power supply assembly. Apparently it had some repairs done in the past as some electrolytic caps have different voltage and capacitance values. The service manual does detail an "AWR-058-0" and it follows closely this thread. According to those, C11...
  7. P

    SX-737 tuner AWE-043 with noise in STEREO

    One of my SX-737 still makes a permanent static noise as soon as the stereo light comes on. The noise stops as soon as the Tuning needle leaves the center marking, or if I switch to MONO. The board has already got to light blue Sanyos together with some other caps and 2SA726 replaced. I...
  8. P

    Basic Question about DC OFFSET and BIAS for the SX-737

    This subject has been discussed so many times, but there is one information missing I like to find the answer. Every reply covering DC Offset and BIAS points to a millivoltage range with 20mVDC for Bias and DC Offset close to 0 mVDC. BUT sometimes it’s very hard to get the DC Offset close to 0...
  9. Super Noob

    Project: SX-7730 (SX-737)

    As the saga continues, I had an opportunity to pick up a couple of vintage Pioneers locally. As you know my flavor is Pioneer, and here is what landed in the garage. A euro 737 and SA-8800. The 7730 had two noticeable issues.... glass was replaced with Lexan & tuning needle was not...
  10. P

    SX-737 AWG-030 Control Amp recommended replacement parts

    I pulled all caps and transistor on the AWG-030 board and that’s what I found. C1 and 2 are special marked tantalum caps instead of the expected sky blue Sanyo 1µf 25V. The other caps like in the SM. The transistor Q1+ Q2 are 2SA763, Q – Q6 are 2SC1312. The 2SC1312 are on the bad transistor...
    • pa_200
    • Thread
    • 2sa763 2sc1312 awg-030 control amp sx-737
    • Replies: 4
    • Forum: Pioneer Audio
  11. P

    SX-737 Problem with short circuit, help needed

    Started on Sunday my planed SX-737 recap project, hoped everything will go well, but it didn’t! Now I need some ideas and help. Let’s start step by step. It’s a 220V GN Modell with an AWR-057 power supply. First test on DBT went well, bulb dimmed an it played music with tuner selected, nobody...
  12. P

    SX-737 tuner AWE-043

    Hi Pioneer Friends, I got a working SX-737 still with original parts. It’s still running with the old parts and I plan a major recap and transistor replacement on all boards, except the tuner board AWE-043. That board seems a bit tricky according to Larrys post here...
  13. zeferinoj

    SX-737, no audio on left channel after a while

    Hello. I'm starting to work on an SX-737 that has never been serviced before. It sounds great for about 5 minutes and then the left channel turns off. I'm just reading posts and looking at threads such as this one for now, together with the service manual, but I thought I'd ask for some...
  14. bzenic

    Bad relay, protection board or something else?

    Thank you for your fast response, starting a new thread as advised. My issue with SX-737 is that the with relay is switching randomly cutting the sound on and off . According to some advices found here I measured the voltages on the protection board WM 025: Pin 1: 6 mV Pin 2: -13.3 V Pin 3: 13...
  15. V

    Pioneer SX-737 Dial Pointer Lamp Troubleshooting

    Hello All! First time poster, but I am at my wits end for this part. I was taking off the glued dial scale to access my SX-737's burnt-out lamps (with help from one of the lovely guides provided to this forum, of course), and my hand slipped and broke the plastic needle off the Dial Pointer. It...
  16. Quaranta

    SX-737 Repair

    Hey all, I have an SX-737 that I agreed to repair for a friend who says the sound, "goes in and out and fuzzy" after a while. I work in commercial audio video so thought it wouldn't be too tough of a challenge.... but after reading up on this forum I am a little overwhelmed. Where do I even...
  17. Quaranta

    New with an SX-737

    Hey All! I work in commercial audio video for a living, so when a friend asked if I could fix the audio "coming in and out and getting fuzzy" in her SX-737 I thought "Sure, how hard can it be?" After searching around on google and AK to see what the problem might be I realized I have a lot of...
  18. rkeller

    Pioneer SX 737 Rebuild with pictures

    Had tons of fun restoring an SX-780 and two 636s (one for my son and another for my daughter, who’s starting to spin vinyl). My friends and family had either forgotten or never knew, just how good music can sound. I was able to pick up an SX 737 from a local Salvation Army store. FYI they are...
  19. Knotty

    BOM Help

    Hello audio brains, ***Please repost to proper section if needed*** I am taking my first dive into a recap or rebuild with a SX-737. I found a BOM that lists capacitors, transistors and a few parts I'm still working to identify. My main question is should I replace all of these or just some...
  20. P

    SX-737 Filter caps and Bleeder resistor

    Yes I know there is a lot of information around and more than 50% who make a recap on the SX-737 are going to change the filter caps as well. BUT is it really necessary and if YES, will you have a really audible difference to the original filter caps? My filter caps 6.800µf/ 50V look still good...
    • pa_200
    • Thread
    • bleeder resistor filter capacitors sx-737
    • Replies: 23
    • Forum: Pioneer Audio
  21. P

    SX-737 power amp AWH-033 issue, blown transistors

    I need some help on the power amp on my SX-737 after an unsuccessful renewal attempt. What was done before! I changed caps and transistors on the power supply, protection circuit, equalizer assembly and as last one the power amp. All DC voltages have been good at the power supply and were even...
    • pa_200
    • Thread
    • 2sb530 2sd370 awm-025 protection sx-737 • awh-033
    • Replies: 148
    • Forum: Pioneer Audio
  22. P

    Mounting new transistors with heat sink on the SX-737 Main Amp

    I have the power amp AWH-033 in front of me and want to change all the transistors Q1 until Q10. The 4 Output Q11 – Q14 shall stay at this stage. I use the BOM list for the SX-737 and everything was fine until I came to the Q7 - Q10. Original installed are 2sd357 and 2sb527 and I have ordered...
    • pa_200
    • Thread
    • awh-033 heat sink sa1220 sc260 sx-737
    • Replies: 17
    • Forum: Pioneer Audio
  23. JayPare

    Pioneer SX-737 clipping with KEF Reference Series 101/2

    My amp is cutting on high volume! Let's say we watch a movie, when the sound goes higher, it cuts out. Can these be paired together? Are those speakers too demanding for my amp? Or maybe my amp needs to be serviced or cleaned?
    • JayPare
    • Thread
    • clipping cutting out kef kef 101 pairing pioneer sx-737
    • Replies: 32
    • Forum: Solid State
  24. R

    SX-737 trying to bring back to life.

    Hello you guys, I just signed up on here yesterday because Google brought me here from looking up a SX-737 my friend gave me. He bought it new when he graduated high school around 1974. So far all I have done is replaced a chewed up power cord and done some vacuum cleaning of inside. I'm not new...
  25. BigD264

    Pioneer SX-737 audio output just stopped

    Hello, I was listening to music on my SX-737 about an hour ago and the sound just stopped. I turned off the receiver and turned it back on and... no click from the receiver at. I'm getting absolutely no audio output. I had an issue previously on the B-Channel where my right speaker would start...
    • BigD264
    • Thread
    • broken no output pioneer pioneer sx pioneer sx-737 reciever sx-737
    • Replies: 23
    • Forum: Pioneer Audio
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