• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

sx-850

  1. M

    Pioneer SX-850 Speaker Relay Mounting Board

    My SX-850 has the ASR-019-0 speaker protect relay which is a 4pdt 24VDC with the bottom mounting flange: I found this mounting adapter board on the bay that works with the current model Omron MY4-GS-R (Digi-Key # 236-MY4-GS-RDC24-ND) relay: I have ordered one and will report back how it...
  2. vwong688

    SX 850 Relay Clicks On then Off

    Hi I put a new Power Supply board in my unit about a month ago and everything has been great, barring an issue with the left channel being slightly weaker than the right. I did perform a DC offset when I had the cover off and thought I did everything correctly. I had also done a rebuild of the...
  3. Brivan

    Pioneer SX-850 with High DC Offset

    Hi, everyone I have a Pioneer SX-850 that's exhibiting high DC offset in both channels (well, maybe). The receiver was service previously and Q5 had been replaced by soldering a replacement transistor to the remainder of the legs of the old transistor (sheesh). It was the correct type (exact...
    • Brivan
    • Thread
    • pioneer sx-850 sx-850 sx-850 dc offset sx-850 offset sx-850 protection
    • Replies: 9
    • Forum: Pioneer Audio
  4. T

    Sx-850 transistor components shortage options?...

    Hello to all AK members! I am a big fan but have never posted. I am a reader of old threads and try to educate myself the best I can...I have the ambition of tackling a restoration project for different reasons, first and foremost, diving in is I think the best way to focus on learning, second...
  5. V

    SX-850 Lamp Issue

    I am having an issue where only one light in the panel is lighting up. I am referring to the main dial and meter lights, of which there are four. Only the bulb in the furthest left position (when facing the receiver) is lighting up. I verified all three other bulbs are working by plugging them...
  6. Rob357

    Rebuilding another Pioneer SX-850 Hum issue

    Hello folks! My SX-850 is on the bench for some new shiny parts. I had enough for the power supply board and ordered kits for the flat amp/tone board and the amp drivers and adjusters. After the power supply was done, I powered it up and success! Speaker relay clicked in. Great, I thought. Not...
    • Rob357
    • Thread
    • awr-101c power supply board sx-850
    • Replies: 4
    • Forum: Pioneer Audio
  7. W

    SX-850 Speaker relay keeps tripping

    I have few old receiver I have collected over the years, basically we have always used them for our sound systems, as one would be going out I would some how get another one. But as good old equipment is get hard to find (and I finally have a work bench again) I am going through these old...
  8. ukfan4sure!

    SX-850 vs SX-950 Differences

    I have both an SX-850 and an SX-950. In casual observation, I can find little physical differences in the two units, other than 15KuF vs 22KuF power capacitors, and 2 vs 3 speaker hookups. Is it the ratings on the output transisitors that make the difference between 65 and 85 WPC? I have a...
  9. Super Noob

    Project: Pioneer SX-850

    Another project hits the bench. Pretty busy summer, but somehow was able to secure an unloved SX-850. If you have read any of my threads, you probably know that I am an absolute sucker for the Pioneer SX-xx50 line. Anyone that has worked on this set, knows it is very well built and easy to...
    • Super Noob
    • Thread
    • pioneer pioneer sx-850 pioneer sx850 rebuild restore sx-850 sx850
    • Replies: 79
    • Forum: Pioneer Audio
  10. mstewart

    SX-850 low voltage on dial lights

    Just did a full recap on my SX-850. I replaced several transistors throughout. Voltages all check out on the power supply board but the voltage on the light panel is low. I'm getting about 6.7-7.2 vac. The manual states it should be 8 v. Bias and offset have been set. From what I can tell this...
  11. mstewart

    Different SX-850 Dial Scales?

    Hello, a while ago I purchased a SX-850 that had a scratched up dial scale. Luckily I was able to find a replacement in great condition. One of the things I noticed when Installing the replacement dial scale is the bottom area where the dial pointer sits is shorter. So instead of the whole...
  12. D

    U-Turn Turntable & SX-850, what speakers?

    Boss-lady got me a a nice turntable to play my ancient Beatles/Janis/Airplane/Zeppelin records on, which i hadn't listened to since I was a kid, its a U-Turn with the walnut base, acrylic platter, Ortofon 2m red cartridge (https://uturnaudio.com/products/orbit-special-turntable), when she got it...
    • Daniyal
    • Thread
    • classic rock newbie speakers sx-850 u-turn
    • Replies: 2
    • Forum: Speakers
  13. B

    SX-850 restore/repair near southern Indiana?

    Greetings! Long time lurker in need of some help. I have an incredibly nice condition SX-850 that's been out of service for about a year. I'd like to get it repaired, and if it needs it, a complete restoration. The receiver turns on and I can output via tape to another receiver, but the relay...
  14. V

    SX-850 very low level hum, right channel only

    This is my first post as I haven't been able to find any clues on this excellent forum but somebody may have had this problem before, which is a hum in right channel only with or without the pre-power jumpers fitted so it is the power amp only at fault, not the power supply as only one channel...
  15. G

    SX-850 failing DBT and no relay click after work on Power Amp

    Hello Everyone, continuing work on the SX-850. I rebuilt the power supply and updated caps and transistors on Protection circuit and EQ board, was working fine after that. I then swapped out the electrolytics and transistors (other than the output transistors attached to heatsink) on the power...
  16. G

    SX-850, UF4004 rectifiers for Power Amp, NTE decent "enough"?

    Hello Everyone, I'm chugging along on my SX-850 restorationhttps://www.audiokarma.org/forums/index.php?threads/850-woes-following-ps-rebuild-some-voltages-off-then-fuse-blew.867032/#post-12671411 I've already done the power supply, protection circuit and EQ board. I was working on the Power Amp...
  17. G

    850 woes following PS rebuild: some voltages off, then fuse blew!

    Hello Everyone, after completing my SA-7100 last month, I started repairing a beat up sx-850 that I'd had in storage for awhile. After replacing some horrific wire splices from Aux and Phonos to selector board...
  18. grey_beard

    Opinions On Teak for SX-850

    I have an SX-850 with damage to the wood veneer on one side. There is about a two inch strip from top to bottom on the right hand side at the back of the case. It's unsightly. Currently the unit has the original walnut veneer which I like, but I am afraid that repairing and matching the 40...
  19. Mitchellk

    Pioneer Sx-850 amplifier board issues

    Hello, I am having an issue with a Pioneer sx-850. R38 and Q6 on the power amplifier assembly is running very hot. So hot you can't touch either within a couple of seconds of turning on the power to the unit. The radio was playing fine when I smelled smoke and found that VR3 had a burn spot on...
  20. Mitchellk

    Pioneer sx-850 power amplifier board heat issue

    Hello, I am having an issue with a Pioneer sx-850. R38 and Q6 on the power amplifier assembly is running very hot. So hot you can't touch either within a couple of seconds of turning on the power to the unit. The radio was playing fine when I smelled smoke and found that VR3 had a burn spot...
  21. Analog-Steve

    Pioneer SX-850 help (newbie)

    I just picked up a Pioneer SX-850 receiver to go with my PL 530 turn-table. I'm having some problems with the 850 and am hoping for some help. It sounds fine when I play music without much bass. However, when there is some heavy bass, my subwoofer rattles like it's blown (it is not) or cuts...
  22. Super Noob

    SX-850

    Just picked up this receiver... and was cleaning (dexoit) the pots and selector switches. Everything going well, then I decided to do the A-B switch the same way. Pulled the (top) cover and now the switch is clunky and not working (engaging) properly. Just wanted to know possibly what I...
  23. pioneerhip

    Is the Pioneer SX-1250 warmer than the SX-850

    Hey Hey Hey! I currently own an SX-850 and like it. I notice the SX-1250 giver a few more options on the tone controls. I do not need the power for my current listening set up, and i'm aware the purist leave their tone controls set at flat. My room needs more than flat controls. Can anyone...
  24. Sensel

    Magic marker station mark removal?

    SX-850 that is pretty clean except… You've seen it before. It is on the grey bar under the channels in front of the glass. 3 or so black Sharpie marks to tell the owner where to tune for those stations. :( Anyone get them off cleanly? The trick I know of is to write/mark with an erasable marker...
    • Sensel
    • Thread
    • exterior cleaning magic marker sx-850
    • Replies: 18
    • Forum: Pioneer Audio
  25. lt.slothr0p

    KEF 104-2 match?

    hi guys, i have a line on a pair of KEF 104-2s that look like they're in good shape for a good price. my question is whether my pioneer sx-850 is a good match for them. i've read that they're not the easiest speaker to drive, but i won't be trying to fill an arena with sound either, so i'm just...
Back
Top Bottom