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sx-1280

  1. Ricktptman

    New to me SX-1280 symptom question

    I just ran across a local SX-1280 that somebody had done a middling decent job of cleaning the exterior. I tested for functionality (within the challenged environment) and it worked, but the relay cut out periodically when the volume was turned up to about 10 o'clock. The speakers were 90s...
  2. X

    SUPER HIGH dc offset SX-1280. Full restoration - final straw !

    This has been a wild restoration. From no power at all to a full blown restoration. Original output were blown, PS resistors and thermal fuse blown. It’s all been recapped, cleaned, most known faulty transistors replaced… I’m on the final straw of setting the DC offset and it seems to be...
  3. J

    SX-1250 Bass & Treble Control Switches Question.

    The 50Hz Bass control switch (ACV-165) shaft is broken on my SX-1250. I'm am having trouble finding another one, but have found a 20Hz Treble control switch (ACV-168). My question is can these be substituted for one another? It appears the pin spacing is the same, they are both 102K, both are...
    • Jada95
    • Thread
    • acv-165 acv-168 bass control control switches pioneer sx-1050 sx-1080 sx-1250 sx-1280 sx1980
    • Replies: 3
    • Forum: Pioneer Audio
  4. Brivan

    AWE-092 & AWE-094 Swap?

    I have a Pioneer SX-1280 with a tuner board that was accidently crippled by me while working on the power supply board. I forgot to put an insulator between the power supply board (while it was pulled out for service) and protection board adjacent to it. The 13v regulator heat sink on the...
    • Brivan
    • Thread
    • awe-092 awe-094 sx-1080 sx-1080 tuner sx-1280 sx-1280 tuner sx-980 sx-980 tuner
    • Replies: 0
    • Forum: Pioneer Audio
  5. Will Gregory

    SX-1280 Tone control variable resistors

    Hi folks, I am a brand new member and have just acquired an SX-1280. The unit works ok but has a couple broken tone control shafts an I am hoping someone can help point me in the right direction to get them replaced. Do any of you have the Bass 50hz ACW-101(ACV-165) and the Treble 10khz...
  6. Brivan

    Pioneer SX-1280 with Hum in the Audio

    Hello, everyone I've been trying to diagnose a low-level audio hum in a Pioneer SX-1280 but, so far, have come up with nothing. I've read other threads in the Pioneer forum that have dealt with the same hum issue, but my situation appears to be a bit different from the others. The receiver...
    • Brivan
    • Thread
    • hum pioneer pioneer sx-1280 sx-1280
    • Replies: 41
    • Forum: Pioneer Audio
  7. goldswimmerb

    Sx-1280 power supply issues

    Working on an SX-1280 and I am suspicious I may have an issue in my PS, both my + and - 33v rails are about +-36v, everything seems to work except the DC offset is slow to settle (around 100mv and falling when the relay closes), max volume on phono causes a pop that causes the relay to close...
  8. Super Noob

    Project: Pioneer SX-1280

    Time for me to share another build. Keep in mind that this 1280 was picked up with some issues. Fired it up on the dim bulb = passed. Seemed to work somewhat... bias was off in one channel and offset was off. I dialed DC offset to a more acceptable level and tweaked bias as close as...
    • Super Noob
    • Thread
    • pioneer sx-1280 rebuild restoration sx-1280 sx1280
    • Replies: 36
    • Forum: Pioneer Audio
  9. B

    Pionner Sx-1280 DC Offset / Pre-amp question

    Hello Pioneer Guru's! I am seeking some advice on my Sx-1280. One of my pre-amp boards will not adjust into spec for the DC offset. The "lowest" I can get it is -1.1V. That is with the VR turned all the way clockwise. The other pre-amp board will adjust no problem. I have replaced all the...
  10. hertzdonut

    Anyone have/heard the monitor line of Tekton?

    Sadly, I have come to the conclusion I am not going to get around to giving proper space for my ADS L1290/2's. (They are currently in a room only 10' x 15', with a corner closet taking up 3' x 5' of that space!)(And the speakers have to unfortunately point across the shortest distance. Add in...
  11. Mike Schmitt

    SX-1280 Transformer

    SX-1280 Transformer open primary? Ideas
  12. mattsd

    Pioneer SX-1280 recap and restoration thread

    Here is the 1280 restore thread I promised! Also, here is the current Pioneer SX-1280 recap list I am using right now. Note in this restoration I am using some different parts compared to the list. Function Switch Board (GWS-173) GWS-173: C9: 10uF 16v CEA: 667-EEA-FC1E100 10uF 25v GWS-173...
    • mattsd
    • Thread
    • list pioneer recap restoration sx-1280
    • Replies: 23
    • Forum: Pioneer Audio
  13. cbusuttil

    Pioneer SX-1280 restoration

    Recently acquired this marvelous receiver. I already own an SX 980, which I restored around 6 years ago. Now I am restoring this SX-1280. Full recap, new output transistors and some other troublesome transistors, full re-soldering of all joints etc. Hope you will enjoy some pictures of my...
  14. hertzdonut

    SX-1280, weak left channel, some troubleshooting done

    I have recapped my 1280 for longevity purposes (there weren't any issues with it). I left the tuner board alone for another time, but replaced appropriate caps and transistors on everything else. I blew a fuse upon startup (note to self: always always always use the DBT) and thanks to some help...
  15. hertzdonut

    SX-1280...and the woman of the year award goes to...

    ..my wife! Talk about stunning me speechless. On Christmas, one of the packages I open has a picture of a Pioneer SX-1280, with a note: "This beast is upstairs in my closet." I look at her, suddenly wondering a hundred different things..is she kidding?..how did she know...how did she find...
  16. Pioneer SX-1280

    Pioneer SX-1280

    • Retro Stereo
    • Media item
    • pioneer sx-1280
    • Comments: 0
    • Category: Pioneer Gallery
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