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headroom

  1. thorpej

    NFB and first stage headroom

    I've been fretting over the first stage headroom in the 6L6GC UL amp I'm working on. Trying to balance quiescent voltage of the 12AX7 AF amp stage against the needs of the DC-coupled differential inverter and finding the most linear operating region of the 12AX7 has led me to setting the bias...
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