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Symptom: Distorted audio
Make sure the Power switch in set to ON rather than STBY
Try changing to a different program source. If the distortion only exists on one source, check the
component that produces that signal. If an FM signal is distorted, try listening to the same station on
another radio.
If the distortion exists on more than one source, check the bias level of all four output tubes. If one
or more tube’s plate current is out of the normal range (45 mA ±4 mA), use the Bias Adjust controls
to set the correct bias.
Check the 12AT7 tubes. Your Red Rose Music dealer can test the tubes for you. Replace them if
necessary.
If the amplifier is in Triode mode, reduce the volume and see if the distortion is only present during
loud passages. You may be overdriving the amplifier. Switch to Ultralinear mode and try again.