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dc balance

  1. N

    SX-890 Bias and Protection Issue

    Trying to wrap up a refurb of an SX-890 and can't get one channel to bias (DC Balance) and it won't get out of protection. At one point it would get out of protection but wasn't stable on on either channel when trying to DC Balance At this point, on the Right Channel I get ~ -35V at pin 12 and...
  2. 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
  3. R

    HK DC Balance Problem

    I have been working on an HK6650R amp which is now working perfectly - almost. Both channels of the power amp showed distortion and the DC balance was WAY out on both (multiple volts). I reheated all solder connections on the power amp board and was then able to dial in the DC balance on one...
  4. mykidsbutler

    SX-780 unsteady DC Balance

    Working on a SX-780. Originally had a lot of distortion. Deox’t. Did a recap and replaced some transistors. Everything I have done has improved the distortion to the point were it is barely noticeable. Last thing I did today was to recheck the DC balance. The balance now swings anywhere from 30...
  5. 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
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