I would give Alfred at Hi End Electronics a call or an email, he sells them. I’m sure he will set you straight. If its anything like a VAC PHI 200 amp then the red light should not be on while music is playing. VAC’s instructions are warm amp for at least 10 minutes, mute the preamp then turn bias adjustment until the red light just goes on then back off the adjustment so the red light just goes off. Hope this helps.
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