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dc offest

  1. R

    Sansui 317 High Volume, Dancing DC Offset after click, A bit not centered.

    Hello guys, i've been infected by Sansui virus. Now i buy another Sansui 317 after long waiting because its getting harder to find. Plan to buy 5900 but its far more worst, mostly many rust on the back panel.. Then suddenly Sansui 317 show up, then i gofor it. As usual when it arrived, check dc...
  2. Z

    Pioneer SX-980 DC Offset fluctuation

    Hello! Been a long time lurker on here but finally encountered a problem I cannot seem to fix! Lets start at the basics: When I first bought this amp one channel was out. Fixed the channel but noticed that the DC Offset would not stabilize but the Idle current for both channels is a steady...
    • Ziconceo
    • Thread
    • cracking popping crackles dc adjustment dc offest pioneer problem problems rebuild sx 980 sx-980
    • Replies: 4
    • Forum: Solid State
  3. G-901

    Sansui G-9000 in protection dc offset

    The receiver is in protection, speaker relays do not click on. Was testing DC offset at terminal 27 and 28 and am getting -2.5vdc tried to adjust it on driver boards but would only get down to -2.2 Vdc I’m at a loss as to what it could be. Any help would be much appreciated
    • G-901
    • Thread
    • bias dc offest g-9000 g-901 protection mode protection problem
    • Replies: 6
    • Forum: Exclusively Sansui
  4. H

    DC on a preamp rising and falling.

    DC offsrt on a preamp ranges from approx 10mV to 350mV, climbs and drops in a cycle that takes a minute or two to complete. (SM says it should be between 0 and 200mV.) How should I go about finding the cause of this? Freeze spray? Trimpots have just been replaced by Bourns, so it's not them...
  5. M

    Balance between DC offset and input voltage levels on replacement STK-0050s

    So, I have an SX-780, which sounded terrific until the left side speaker bank developed distortion. Traced it to a failed STK, and decided to replace both STK in the short term with a replacements bought online. I WILL be purchasing, assembling and installing the much-better replacement...
  6. 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...
  7. Mightyhal

    Can't balance DC on SX-880 after repairs

    Following up on https://audiokarma.org/forums/index.php?threads/sx-880-output-transistor-replacements-b705a-2sa1075.961503 -- I've had some ups and downs repairing the SX-880 (I'd shorted part of the power supply with a probe slip, and one of the output chips had shorted--one which had been...
    • Mightyhal
    • Thread
    • 880 bias circuit dc balance dc offest sx-880 transistor equivalent transistor replacement transistor substitute
    • Replies: 6
    • Forum: Pioneer Audio
  8. klamsoss

    Technics SA-203 with DC offset

    A friend of mine brought me the above mentioned receiver hoping I could fix it up for an office system for him. It's a compact little unit with decent specs and some trick looking panel functions for the tuner section. The original issue was that it wouldn't turn on. I figured it might be a dead...
  9. twelvety

    Harman Kardon PA2200 unstable DC offset and mysterious rails voltages

    I've scoured these forums for years and now I have a problem to ask you all about. I've learned so much already from @ConradH 's amazing Troubleshooting Audio Electronics Without Tears. It has reinforced the belief that I can figure this out if I understand the circuits well enough and test...
    • twelvety
    • Thread
    • dc offest harman kardon power supply voltage
    • Replies: 3
    • Forum: Solid State
  10. P

    Some questions for the power supply on a SX-750

    I got an untouched SX750 a few days ago and started already to work on the different boards. Before disassembling I took the AC and DC voltages at the Power Supply Assy AWR-099 and AWR-100. Pin 12 and 16 should be +/-48 vdc but pin 12 hat +53.9 vdc and pin 16 -55.5 vdc. The only thing I changed...
    • pa_200
    • Thread
    • awr-099 awr-100 bias dc offest power supply sx-750
    • Replies: 13
    • Forum: Pioneer Audio
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