Recent content by Dahond

  1. Dahond

    Trying to bring Sansui AU-517 back to life

    Looks amazing @Leestereo Why did you increase capacitance in the AU 717?
  2. Dahond

    Trying to bring Sansui AU-517 back to life

    Leestereo's work looks very nice. I will certainly check his threads. Here's the assembled 517 with his partners. Thank you very much again.
  3. Dahond

    Trying to bring Sansui AU-517 back to life

    I'm going to reassemble it for now and enjoy for a while. I've recapped the powerboard with some cheap caps at first to try and figure out the problem. I'll be ordering some decent replacement caps, new zeners,1N4148's, maybe recap the preamp and EQ too in the near future. This whole adventure...
  4. Dahond

    Trying to bring Sansui AU-517 back to life

    Zener voltages: Right: ZD01 22.55 ZD02 -23.11 Left ZD01 21.93 ZD02 -23.30 Seems like they are only off by 0.6v max -> 0.8v on the left ZD02
  5. Dahond

    Trying to bring Sansui AU-517 back to life

    IT'S ALIVE Oh man this is great! No more protection problems. Thank you this is really amazing. SO stupid I didn't check the resistors well enough @kevzep Thank you so much @Hyperion for taking a look. I'm quite happy right now :) My wife's going to be disappointed the big sansui SP3500...
  6. Dahond

    Trying to bring Sansui AU-517 back to life

    Haha this is stupid. You're right. they are 330 ohm. I'm quite ashamed not seeing this. Not sure about the R47. I didn't change them and the schematic says 2.2 ohm. I wil solder them out and check again.
  7. Dahond

    Trying to bring Sansui AU-517 back to life

    So. I've measured the voltages again this morning after the last reply. + and - 50,8v supply Zenerdiodes Left channel ZD01 21,82v ZD02 -23,16v Right channel ZD01 22,45v ZD02 -23,09v They changed a little. Didn't do anything to it :-/ Right and left:
  8. Dahond

    Trying to bring Sansui AU-517 back to life

    I used the diode test on my multimeter for the VD1212. As I said I'm not a skilled technician so everytime I suspect a component I search the web how to check it. Before I started ressurecting this amp I hardly knew anything about transistors and diodes. I only knew how to follow schematics...
  9. Dahond

    Trying to bring Sansui AU-517 back to life

    Yes. Output resistors R44 and R45 have been replaced together wit the output transistors. I've checked every resistor on the boards (maybe even four times :)) and replaced everything that seemed dodgy. Do you think the difference in voltage at the zenerdiodes could activate protection circuit?
  10. Dahond

    Trying to bring Sansui AU-517 back to life

    I really would like to get this fixed. I really like the sound through the sansui SP3500 speakers. Don't know how to quote so I'll @ for reply :) @slimecity : the problem occurs in both channels @Hyperion : The fuse resistors seem to be changed already, they look like ordinary brown colored...
  11. Dahond

    Trying to bring Sansui AU-517 back to life

    Thanks for the reply. I bridged the switch and even tried the poweramp with a different preamp. It still goes in protection with speakers. I can't find the cause of why it works with headphones but not with speakers. 64 ohm <-> 8 ohm.
  12. Dahond

    Trying to bring Sansui AU-517 back to life

    Hi, I'm from Belgium. I've been reading through this forum for a while trying to revive my sansui AU-517. I've already found some great tips here but now it seems I'm stuck. The amp was given to me a few years ago, including a sansui turntable and sansui speakers. I worked great for a few...
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