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OTL, Output Transformerless Amplifier User Group.

This amplifier is updated to what looks like some form of MkIII.

-As a result the Bias is automatic. You only adjust the DC Offset.

Depress the Test button on the rear panel, adjust the DC Offset control for a zero ('0') reading on the meter. Do not do this when signal is applied as the meter can be easily damaged.

Check it again after 1 hour of operation.

That's it- pretty easy.

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