• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

bias settings

  1. 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
  2. dlucy

    Which (of these three) resistors to measure for bias adjustment?

    I've just finished recapping a fine little Kenwood KA-4002 integrated amp and I'd like to adjust the bias. There are two trimpots on the main amp portion of the one an only board in this unit and the generic Kenwood bias adjustment guide link indeed listed the KA-4002 and a bias to shoot for...
    • dlucy
    • Thread
    • bias adjustment bias settings ka-4002 kenwood
    • Replies: 12
    • Forum: Solid State
  3. M

    Spec 2 bias (again??)

    Greetings! I think I've read all the relevant posts and still have a question. I am working on a Spec 2 that someone else has worked on. I upgraded all the TO-220's, electrolytics, and bias relays on the amp channels. I had an open R61 (thermal sense supply) and protection lamp on the meter...
  4. D

    Help with DC offset on NAD 7125.

    Hi guys, posted before about DC offset on my NAD 7125 receiver. Please bear with me because I am new to this and love to learn. Recently I noticed my right speaker was lacing some bass/mid. And my left speaker was sounding a bit to loud. I trouble shot the speakers and it's not them. Read the...
  5. E

    EL34B bias issue on Grant Fidelity W30 GT

    I've changed the KT88 on the Grant Fidelity W30 GT for EL34Bs. Before I swapped the valves I dialed down the bias to .35v as recommend . The newly installed EL34Bs bias readings are less that .03 volts DC which is ten times less the .35 to .40 volts range indicated in the manual . Has...
    • Edzacc
    • Thread
    • bias settings el34b grant fidelity w30 gt
    • Replies: 0
    • Forum: Grant Fidelity
Back
Top Bottom