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power amp

  1. R

    2230B got 27V DC in power amp input!

    Hi, Got a non working 2230B from eBay and planned to repair it myself. Tuner and pre amp sections work well but power amp has 23-27 V DC in one of the channels input, that is J701 in diagram. Voltage rises from 23 to 27 as power transistors and heat sink warm up. And they get hot in short time...
  2. I

    Preamp and Power amp matching (Arcam, Creek ...)

    Hi all, (sorry for the long post, your help is truly appreciated) A short intro for context: I've been reading this forum (and others) for awhile, trying to decide on components for a stereo system for a small office setup. Auditioning in shops was difficult for me because of lack of time...
  3. S

    Amp Quest - dual mono or mono at a decent price point

    Hello, New member whose poor 2-channel system has been woefully lacking and has finally decided to make amends with his ears. First stop is power amplification. My criteria seem to be at odds with the market (and possibly my wallet), and I could really use some sage advice. Criteria after lots...
    • scoran
    • Thread
    • affordable finesse japan monoblock power amp quality
    • Replies: 6
    • Forum: Solid State
  4. strat68

    Adcom GFA-535L power amp distortion clipping warning LED

    Hi all, Adcom question, but some background first, if too long-winded skip the next 3 paragraphs of how I got the amp and speakers. I recently picked up some gear from Craigslist, I was after decent floor standers with WAF as we got new furniture just before the holidays and the double stacked...
    • strat68
    • Thread
    • adcom clipping distortion led power amp red yellow
    • Replies: 18
    • Forum: Solid State
  5. D

    How can I test my NAD 2200 stereo power amp

    I would like to test my NAD 2200 stereo power amp, but not entirely sure how given my current set up. I have a pioneer pl-4 turntable > technics sh-8017 graphic EQ > Kenwood kr-9400 receiver > fisher ST-925 speakers. Can I use the Kr-9400 as a pre-amp? If so what inputs and outputs do I use...
    • Dan72
    • Thread
    • kr-9400 nad 2200 power amp
    • Replies: 7
    • Forum: Solid State
  6. W

    IC Power Amp and Voltage Amp Question- Sansui R-99Z

    I'm currently working on a Sansui R-99Z that has some real issues. As soon as it powers on a faint, crackly signal comes out the left speaker but quickly (5 seconds or so) fizzles and goes completely quiet. This is a later model Sansui, and the power amp is completely contained in an STK2139 IC...
    • W.T. Holt
    • Thread
    • integrated circuit power amp sansui solid state stereo voltage amp
    • Replies: 6
    • Forum: Solid State
  7. B

    Output Transistor replacement Crown Amp xs1200

    Hello all of you beautiful people, i have a crown xs1200, i bought it knowing it was blown up. Tore it all apart and quickly identified two failed Output transistors on channel two. Amp is two channels total. Each channel has 8 OP devices. 4 npn and 4 pnp. Removing the two duds (one shorted, one...
    • BDB
    • Thread
    • crown drivers output devices power amp transistors
    • Replies: 14
    • Forum: Solid State
  8. D

    PrimaLuna Prologue 4 power amp

    Anyone heard it?
  9. 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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