INSTALLATION & OPERATION
BEFORE APPLYING POWER, MAKE SURE:
1. Unit is connected to the correct voltage source with a proper 3-wire grounded outlet. Use only
the AC cord provided.
2. Cooling vents are free from obstruction.
3. Speakers are plugged into the correct output jacks using minimum 18-gauge speaker cable.
DO NOT USE SHIELDED CABLE.
4. Impedance selector is at correct setting. See Speaker Connection.
5. Fan speed switch is set at “Hi.”
6. Standby switches are set to off (“0”) position.
CAUTION
DUE TO THE HIGH POWER OUTPUT OF THIS EQUIPMENT, IT IS IMPORTANT TO BE
AWARE THAT ELECTRICAL SAFETY AS WELL AS SONIC QUALITY CAN BE SEVERE-
LY COMPROMISED BY THE USE OF SUBSTANDARD OR UNDERRATED AC POWER
SOURCES. DO NOT USE UNGROUNDED OUTLETS, MULTIPLE OUTLETS AND/OR
EXTENSION CORDS SMALLER THAN 18 GAUGE.
SPEAKER CONNECTION
It is extremely important to select the proper impedance setting for the speaker system(s) used. This set-
ting is determined separately for each channel; that is, one 16-ohm speaker in channel A = selector set-
ting “16”; one 8-ohm or two 16-ohm cabinets = selector setting “8”; one 4-ohm or two 8-ohm cabinets =
selector setting “4.”
Some manufacturers represent impedance mismatching as an optional tone-modifying technique. Due to
the extremely high power output and dynamic range of the 2150, we strongly advise against this practice.
The one exception to this rule applies to the operation of the Classic series in the low-power setting. In
this case, with the Standby switch set at half-power (“I”), the “Impedance Select” settings are divided by
two for a correct match; i.e., setting “16” = 8 ohms; “8” = 4 ohms, etc. Observing this correction will
ensure proper speaker/amplifier interaction.
CAUTION
FAILURE TO OBSERVE PROPER IMPEDANCE SETTING MAY SIGNIFICANTLY SHORT-
EN TUBE LIFE AND/OR CAUSE SEVERE DAMAGE TO THE AMPLIFIER. DAMAGE
RESULTING FROM IMPROPER SPEAKER INTERFACE IS NOT COVERED UNDER WAR-
RANTY.
VENTILATION
The cooling system in the 2150/Classic is designed to draw heat out of the enclosure and provide the
maximum amount of cooling for the power dissipated in an enclosed space.
Occasionally, when recording or performing in a quiet environment, fan noise may be a problem. Under
these circumstances, the “Lo” fan speed may be used. To set the fan to “Lo,” gently insert the proper-size
screwdriver into the switch slot and rotate the switch to the left (counterclockwise) until a click is heard.
Turning the switch in the wrong direction or attempting to force the switch past its detent point may cause
permanent damage to the switch. Return the fan switch’s setting to the “Hi” speed position once normal
or high-volume operation has resumed.
CAUTION
OPERATION OF THE AMPLIFIER AT HIGH VOLUME SETTINGS WITH THE FAN SET AT
“LO” MAY RESULT IN SEVERELY SHORTENED TUBE LIFE.
9
To Next Page
Loading...