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bias adjustement

  1. Ray122

    Pioneer SX-950 HELP!!!

    Hey everyone! In desperate need of some help here. I'm working on an SX950 for a friend, and for the life of me, I can't seem to keep the output transistors on the right channel from frying. I've gone through this a few times now and it's getting very frustrating. I had everything working just...
    • Ray122
    • Thread
    • amp bias bias adjustement counterfeit diy help idle current output transistors pioneeer repair sx950
    • Replies: 17
    • Forum: Pioneer Audio
  2. MattiaM

    Sony TA-8650 bias adjustment

    Since there is no unique source of information on the bias for the Sony TA-8650, with no mention of changes from the 125mV in the original Sony Service manual in any service bulletin, and rumors from a Japanese forum of a required new value of 30/40mV, I decided to do a quick and by no means...
    • MattiaM
    • Thread
    • bias adjustement distortion sony vfets ta-8650 vfet vfets
    • Replies: 8
    • Forum: Solid State
  3. Kingsin7

    Mcintosh MA230 Bias Voltage

    I've begun to notice a slightly louder than usual hum coming from my Mac MA230 that I use daily in my office setup. It has been about a year since I last reset the bias, so I decided to take it out of it's wood case today to make adjustments. After reviewing the manual, a voltage of 0.7v is...
    • Kingsin7
    • Thread
    • bias bias adjustement mcintosh tubes
    • Replies: 20
    • Forum: Tube Audio
  4. ekimezeerf

    CA-800 Bias Problems After DOA Rebuild

    Hey everyone, long time lurker, first time posting. A friend brought me a dead CA-800, would not power on and many signs of heat stress on main amp and power boards. Our thought was the PO has dumped a bottle of cologne on it due to it's aroma and the goop present everywhere inside. I've...
    • ekimezeerf
    • Thread
    • bias bias adjustement ca-800 rebuild yamaha
    • Replies: 23
    • Forum: Yamaha
  5. dlucy

    How to adjust the current bias in Kenwood KR-6160 receiver

    In a current thread, some of our resident Kenwood experts chime in on where to measure the voltage across emitter resistors in order to calculate the current bias... so you can then adjust a trimpot to bring the current bias up or down to factory spec. I have the "Kenwood Audio Adjustment" PDF...
  6. genlabs

    Cannot bias SAE A202

    Hi all: Full disclosure: I am no expert at this stuff. I have repaired my fair share of equipment but most of those repairs were straight forward, easy to find parts repairs. I am trying to learn at least one thing everyday. I am working on a SAE A202. I cannot bias this thing at all. The...
  7. L

    Marantz 140 - BIAS not stable

    Hello ! My Marantz 140 seems having issue regarding the BIAS adjustement on the left channel. It lose his adjustement every 2 or 3 months (goes to +50mv). Yesterday, I was worried of the temperature because the left side was hotter than the right side. After adjustement, the left side BIAS goes...
  8. M

    Fisher 500 mono tube bias

    I have a Fisher 500 mono receiver. The chassis is marked "EL37" for the output tubes. The EL37's were replaced by 6L6GB's by a previous owner. EL37's are scarce and way out of my budget, and new KT66 won't fit (glass diameter is too large). The only Sam's schematic I can find is very close, but...
    • mmblh
    • Thread
    • bias adjustement ta-500
    • Replies: 10
    • Forum: Fisher
  9. bberkom

    Setting Voltages on Sony TA-1120A

    I am in the process of restoring a very nice Sony TA-1120A integrated amp, and I have questions about the procedure for setting the AC bias current. I'm comfortable setting bias on amps where values and test points are clearly stated. However, the instructions in the service manual require the...
    • bberkom
    • Thread
    • bias adjustement sony ta-1120a
    • Replies: 39
    • Forum: Solid State
  10. bibota

    Readjusting bias current and DC offset - Marantz 2230

    I'm currently in the midst of my first project, recapping a Marantz 2230 and meeting quite a few difficulties along the way. All of them feeding into the learning curve, to put a positive spin on it. I keep reading that after recapping the tuner boards, a "readjusting of the bias current in the...
    • bibota
    • Thread
    • am rf board bias adjustement dc offset marantz 2230 p150 recapping sound after recapping
    • Replies: 21
    • Forum: Marantz Audio
  11. S

    sansui 881 bias adjustment issue

    so I've recapped my Sansui 881. I did one board at a time and always checked her on a dim bulb tester and did a basic function test between each board. I am now setting the final DC offset and Bias adjustments before buttoning her up and putting her back into services. I have the DC offset...
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