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bias

  1. ssouci

    Fisher X-202 - Bias & DC Balance settings using tool?

    I have a newly-acquired Fisher X-202 amplifier (not X-202-B) I want to check and adjust the Bias and DC Balance settings, but notice that the official Fisher method requires desoldering a jumper and taking reading from beneath the chassis, something I find to be a real PITA and would rather...
    • ssouci
    • Thread
    • adjustment bias dc balance fisher x-202 tools
    • Replies: 12
    • Forum: Fisher
  2. Richs_Trains

    Marantz 2220b Bias Questions

    Hello all, My saga of the 2220b goes on. I posted in another thread the power amp PC from the 2220b I was trying to recap, it showed some very questionable factory connections and foils. After I installed the new caps and tried to adjust the amp, I could get everything right except the bias...
  3. Richs_Trains

    SM for Marantz 4070

    Hello, Need, but can't find an SM for the Marantz 4070 Amp. Any help please..... Rich
  4. Richs_Trains

    1090 Basket Case

    Okay, so I bought a 1090 on craigslist for $50.00 to use for parts for a 1090 that I recapped. This unit was filthy inside and someone had pulled 1 output transistor from each channel, a 588 on one side and a 618 on the other. I was just going to take the cosmetic parts I need and trash the...
  5. Gary Mattis

    Fisher bias vs. Mod pot bias ?

    I had a thought about tube matching and separate bias pots vs. Fishers factory all bias the same set up , which is better ? , Is the output power match more critical then trying to bias match the ma readings through negative bias methods with separate pots ?, sure separate pots cures one problem...
    • Gary Mattis
    • Thread
    • bias fisher mods tube amps
    • Replies: 23
    • Forum: Fisher
  6. F

    Issue with Luxman M-4000 Idle / Bias

    I've been working on this amazing Luxman M-4000 power amp project for a while now. I got the amp fully intending to rebuild it and made it pretty far. I have done some recapping before and usually it's a paint by numbers affair. Once I hit this issue, I've been stumped. Little by little I'm...
  7. B

    Marantz 140 Adjusting DC offset and bias ?

    Hello guys,im new to this kind of things regarding electronic repairing etc etc, can someone tell me how can i adjust the bias on my Marantz 140? Where do i connect dvm, on which pins ?I have the manual, but to me its unclear where should i connect the digital multimeter in order to adjust the...
    • Bogdan1986
    • Thread
    • bias dc offset help marantz 140
    • Replies: 6
    • Forum: DIY
  8. Kasanay

    Individual Bias Pots on a 440A???

    Anybody know if it is possible (and worth the effort) to swap the single bias pot for four individual pots on a console amp like the 440A? I have such an amp running as a stand-alone and I think having the ability to adjust the tube bias individual would be a nice feature. I know this topic has...
    • Kasanay
    • Thread
    • 440a bias bias adjustment fisher
    • Replies: 8
    • Forum: Fisher
  9. A

    AU-317 - bias problem causing blown outputs?

    Hi all I'm repairing a 317 that went pair shaped a few weeks ago. I'm learning as I go but I've got into new territory and I'd appreciate a little help narrowing the search for what might be the problem. I replaced output transistors TR17 and TR19 and driver transistor TR15. It now seems to...
  10. 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
  11. Nac458

    Marantz 1030 Problem(s)

    Hello all, So there I was. I had just completed an entire re-cap for the little 1030 amp. I was excited to hit the switch and resolve the "bad capacitor problem" on the power amp board. But upon doing so, only the left channel was able to come through and I was left disheartened and...
    • Nac458
    • Thread
    • bias marantz marantz 1030 resistor transistor
    • Replies: 10
    • Forum: Marantz Audio
  12. Chriswashere

    Pioneer sx-850 bias adjust

    I noticed the manual for this model did not show how to adjust the bias. Does anyone know the proper procedure? I assume it is the same as the sa-9500 since both models have a fairly similar output board. Any help would be great.
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