Gallien-Krueger 400RB series, Руководство по обслуживанию

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2) Turn front panel knobs to 10, switches out.
3) Connect front speaker to output and listen to noise. It should be smooth, not crackling.
4) Change AC voltage range to 1V.
5) Noise should measure less than 400mV.
6) Engage low-cut, contour, and hi-boost. Noise < 400 mVrms.
7) Volume to 0. Noise < 100mVrms.
8) Boost to 0. Noise <10 mVrms.
Return knobs to zero, switches out- ready for burn-in.