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idling

  1. mozcho

    Tube Amp: Warming Up & Idling

    Some simple questions: 1. Tube amp should not be powered on without speakers connected to it. True? 2. Some manufacturers suggest that their tube amps sound best after 30 minutes powered on. Should we play any music on it during that period of time, or should we just leave it silent while...
    • mozcho
    • Thread
    • idling tube amp warm up
    • Replies: 15
    • Forum: Tube Audio
  2. Homer4beer

    Idling current adjustment help - Marantz PM7200

    Hi guys, I managed to fix this amp and am now trying to adjust the bias. I am measuring the voltage across the two legs as per the service manual. I've attempted to adjust the bias now. For the bias for AB, set from cold, I can set both variable resistors to measure 0.4mV < 1 min. For the...
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