User`s manual

1.5 Safety Considerations
The Retro 176 is to be used in a metal equipment rack with adequate ventilation. The
vacuum tubes become hot. The AC mains power should be disconnected prior to
servicing. For safety, the front door of the 176 is equipped with an interlock switch that
interrupts the AC mains power when the door is opened. This switch should not be
defeated. Only trained technicians should open the front door to gain access to the
internal adjustments. Tubes should not be removed or inserted with the power on. An
accidental breakage of the glass envelope can expose high voltage on the plate of the
tube.
This product is grounded through the AC Power Cord. For safety, do not lift or remove
the ground from the AC Power Source.