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CAUTION: Maladjustment of the bias controls can lead to output tube failure. The bias
adjustment is not fool-proof, and output tubes can be under-biased (i.e. too "hot"). The bias
control needs a wide enough range to accommodate different tube types and sets (tubes
vary from set to set), and therefore it is possible to under-bias the output tubes in some
cases. If under-biased for a sustained period, the output tubes will likely fail. Science
Amplification is not responsible for output tube failure due to maladjustment of bias
controls.
Please familiarize yourself with the bias procedure before making bias adjustments. If you
feel uncomfortable making adjustments, take the amp to a qualified technician. We do,
however, encourage you to bias yourself. It is easy once you get the hang of it, and can save
you quite a bit of cash!
WARNING: Adjusting the bias requires the amplifier to be ON. The output tubes adjacent to
the test points and adjustment control get very hot during normal operation and there is a
potential burn hazard. Be careful near those hot tubes!
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