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offset

  1. Schmurpy

    Manual for Project One Mark 1500, or Telefunken TR-1500 DC.

    Hello, does anyone have the manual for either the Project One Mark 1500, or Telefunken TR-1500 DC?
    • Schmurpy
    • Thread
    • bias documentation information offset pacific stereo rare receiver repair restore service
    • Replies: 0
    • Forum: General Audio Discussion
  2. Brivan

    Pioneer SX-880 DC Offset High

    Hello, all I have a Pioneer SX-880 on the bench that is exhibiting high negative DC offset. The receiver originally had two blown 1-amp fuses: FU2 & FU3 (I chuckle whenever I see FU2). I found D26 shorted, as well as Q29 & Q30 with shorted junctions. All were replaced with correct modern...
    • Brivan
    • Thread
    • offset pioneer sx-880 pioneer sx-880 dc offset sx-880 sx-880 dc sx-880 dc offset sx-880 offset
    • Replies: 2
    • Forum: Pioneer Audio
  3. ocdecio

    170DC offset odd behavior

    I have a 170DC with a very strange quirk in one of the channels - the DC offset starts off at about +4V, goes down enough to click the relay and starts going in the other direction and when it reaches -2V the relay of course goes in protection. I read here that it could be an open trace...
  4. T

    6060 running hot

    It's been a long journey with this 6060, mostly centered around the 2647 Driver board. After replacing the 2SA726 Transistors and a recap of that board, I get clear sound on all inputs from both channels and the bias on both sides adjusts to in spec per the service manual. I'm not sure if the...
  5. Stereoboy70

    Sansui 350 Bias and offset

    Does anybody have the adjustment procedure for this receiver ?? I have a service manual but it doesn’t show how to set the offset or bias current. Any help would be appreciated. I just got this receiver and fixed a couple of issues. The headphone jack was giving me issues with the L...
  6. THD

    L-09M test points?

    So...I have my 2 L-09Ms that are recapped and refurbed and ready to be used, but all the shitty service manuals online show a horrible rediculous picture of where the bias & offset test points are on the back of the circuit board. A dot matrix of bullshit. What? Is it some kind of secret puzzle...
  7. T

    Marantz PM550DC DC Offset voltage fluctutuation

    Hi all I have a Marantz pm520dc and when I check the dc offset from power on its around 28mV for both channels but after 30 mins it slowly fluctuates down to -7mV is this normal for the voltage to fluctuate?
  8. S

    AUX Splitter Volume Offset

    Hello, I am using a 3.5mm AUX splitter in my car for two devices into my speakers. The splitter automatically offsets the volume to its own percentages, that being said, how can I control the volume offset when one device feeds audio at the same time as the other device?
  9. crkeith65

    Kenwood KR4010 I killed it and need help

    A friend asked me to service his Kenwood KR4010. It played but was real noisy so I knew it needed the usual De-Oxit treatment. I recapped the Power Supply section and had it sounding pretty good with one small problem. Sometimes the left channel sounded like a broken speaker. A little freeze...
  10. crkeith65

    Kenwood KR4010 I killed it and need help

    A friend asked me to service his Kenwood KR4010. It played but was real noisy so I knew it needed the usual De-Oxit treatment. I recapped the Power Supply section and had it sounding pretty good with one small problem. Sometimes the left channel sounded like a broken speaker. A little freeze...
    • crkeith65
    • Thread
    • kenwood kr 4010 kr4010 no power offset power supply sansui voltage
    • Replies: 2
    • Forum: Solid State
  11. Jeff Howard

    Sansui AU-717 DC Offset & Bias Help

    Hey Audio Karma. I am new to the Hi-Fi Audio world and am in need of some of your knowledge. I am almost through re-capping a Sansui AU-717, and am curious about adjusting the DC Offset and Bias of this amplifier. Does anyone have experience in this or know a thread with good info? Much obliged!
  12. Shrugg

    Yamaha R-9 - Strange bias and offset issue

    Hello all, I am getting some very strange voltages on my Yamaha R-9. After testing it both on headphones and speakers and verifying that it sounded ok, I measured the offset and bias. For the offset, the left channel was a solid 18 mv, but I was getting a strange fluctuating voltage on the right...
  13. Isaac C.

    Help Wanted Biasing a Lafayette LR-3500

    Hello everyone, I am new to the AudioKarma forum, however, I have been viewing the site for a few months now. I am also new to vintage audio equipment, having just gotten into the hobby last fall. Anyway, I acquired a Lafayette LR-3500 a few weeks ago on eBay for $70 in working condition. Since...
    • Isaac C.
    • Thread
    • biasing lafayette lafayette lr-3500 offset
    • Replies: 14
    • Forum: Solid State
  14. Halisson

    Help Repair Marantz 2285B - Bias Adjust

    Hello friends, greetings from Brazil. I'm doing the repair on a Marantz 2285b and I'm having a hard time getting the BIAS adjustment. DC OFFSET + - = 0vdc. Reading based on q710 ranges from 0.7vdc to 2.1vdc, stirring in the BIAS trimpot Base of q709 does not vary anything, staying at -0,800vdc...
    • Halisson
    • Thread
    • 2285 2285b adjustment bias adjustment bias settings marantz offset
    • Replies: 2
    • Forum: Marantz Audio
  15. Kahoona

    Mitsubishi DA-A7DC help needed

    Hi I am hoping that some kind soul can offer some help. I have a DA-A7DC that I picked up recently. I wanted to set the bias and DC offset.I found this thread and I have set DC on many amps. http://www.audiokarma.org/forums/index.php?threads/mitsubishi-da-a7dc-bias-and-dc-questions.441384/ I...
    • Kahoona
    • Thread
    • bias da-a7dc mitsubishi offset parts
    • Replies: 28
    • Forum: DIY
  16. QSilver

    QM-800 Help

    I got this today to add to my quadraphonic collection and to maybe try bi-amping some speakers. Everything looks reasonable inside although someone has sabotaged the front speaker outputs. I powered it up and I've been trying to set the offset and idle current but I'm have problems.... I cant...
    • QSilver
    • Thread
    • idle current offset pioneer power amp qm-800 quadraphonic quadrophonic vintage
    • Replies: 46
    • Forum: Pioneer Audio
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