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fluctuating

  1. R

    [HELP] Sansui AU-7500 dc offset sudden fluctuate

    Hello AKers, i just bought AU-7500 and not recap yet, because i want to hear how it is before recap. And after checking all transistor i think its still original. Some transistor is not like in schematic, but its looks old. While i test with speaker first day when i turn the power knob off, i...
  2. MartyGee666

    Marantz 2250 bias fluctuation

    Hey! I'm getting a wondering bias voltage across pins J708 & J710 (bias voltage). Its causing some annoying static and I'm not sure where I should look first. The unit has been re-capped and sounds great for the first hour, but eventually the bias fluctuates on the left channel and it throws the...
  3. sean sweeney

    Carver 1.0t Repair (variac issue? yes or no?)

    OK>>>> pretend I said TRIAC.... ugh... sorry I've done a fair amount of work on this, and did the complete MKII upgrade and attempted to set the bias and voltage, but the supply voltage came on at about 60v and then started to decline... I pushed the main voltage reostadt just a little and the...
    • sean sweeney
    • Thread
    • 1.0t carver fluctuating help mod power supply problem sag variac version ii
    • Replies: 2
    • Forum: DIY
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