Audio Research I/50, Manual

Page: 10 / 24

10
If the unit is to be operated in an enclosure such as an equipment rack, make certain that adequate airflow above and to each side of
the unit is provided. Audio Research recommends a minimum of 6-8 inches (15-20 cm) of clearance above the I/50 to maintain proper
ambient operating temperature. It is not recommended to operate the I/50 in an enclosed cabinet.
The ‘ambient’ operating temperature should never exceed 120° F or 49° C. Improper installation will cause premature tube failure and will
affect your warranty, as well as the service life of the unit.
It is normal for a vacuum tube amplifier to run quite warm, and if used for prolonged periods, hot to the touch. All components within are,
however, operated at safe, conservative levels and will not be improperly affected thereby, providing the requirements outlined above
are adhered to.
A Note about Vacuum Tubes
The vacuum tubes in your I/50 have been burned in, tested and electrically matched to provide the best performance and reliability of
your amplifier. That said, vacuum tubes must be replaced from time to time. The 6922 tubes in the I/50 should have an expected life of
approximately 4,000 hours, while the 6550WE tube in the power amplifier should have a life expectancy of approximately 2,000 hours.
These life expectancies are only approximate. The damper rings on the 6922 tubes may be reused.
Important: When replacing vacuum tubes, please seek assistance from your dealer or local service shop. The bias will need to be
readjusted for the new set of installed tubes.
INSTALLATION