adjustable feedback
  1. Manley Laboratories Absolute Headphone Amplifier

    Manley Laboratories Absolute Headphone Amplifier

    Class A Reference Quality Triode Tube Headphone Amplifier / Preamp, switchable between Single-Ended and Push-Pull, adjustable Negative Feedback, three gain settings, 4 pin XLR output, 3 selectable impedance settings, switchable mono / stereo, left / right balance, defeatable bass / treble EQ...
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