CONTROLS & FUNCTIONS
REAR PANEL
1 VOLTAGE RATING: This plate indicates proper voltage rating of the unit.
2 MAINS: AC input socket. See Installation & Operation.
This amplifier is equipped with a grounding-type supply cord to reduce the possibility of leakage
current. Be sure to connect it to a grounded receptacle. Operation from an ungrounded (two-
pronged) AC receptacle requires a 3-to-2-contact grounding-type adapter. Be sure to connect the
adapter’s grounding lead to a good earth ground. DO NOT ALTER THE AC PLUG.
WARNING
FOR CONTINUED SAFE OPERATION, USE ONLY THE AC CORD PROVIDED.
3 MODE (Classic series only): This switch changes the operation of the EL34 output tubes, which use five
components inside each tube. With this switch in the up position, the tubes run in the Pentode
mode, and all five components operate for full 100-watt power. The sound is brighter and crisper.
With the switch in the down position, the tubes run in the Triode mode, and three components
operate for 50-watt maximum power. The sound is smoother with a little less edge. Experiment!
4 IMPEDANCE SELECT: The impedance of a speaker or combination of speakers must equal the value
set on the “Impedance Select” switch for each channel. See Installation & Operation.
5 6 SPEAKER OUTPUT: The speaker output jacks are wired in parallel. Channel will not operate
unless the jack labeled “Use First” is used first!
CAUTION
DO NOT OPERATE UNIT UNLESS THE SPEAKER (OR OTHER CORRECT IMPEDANCE
LOAD) IS CONNECTED TO THE SPEAKER OUTPUT JACK(S). FAILURE TO USE THE
PROPER SPEAKER LOAD MAY RESULT IN DAMAGE TO THE AMPLIFIER.
7 VOICING: Position “1” voicing produces smooth, open midrange with soft highs and slightly rolled off low
end. Position “2” voicing produces sharper highs, punchier midrange, and beefier low end.
8 10 INPUT A/MONO AND B: Input signal is fed to the input sensitivity switch, then to the volume control.
Signal fed to the “A/MONO” input automatically “normals” (connects directly) to the B input when the B
input jack is not connected. (Both channels’ outputs must still be connected to separate speaker sys-
tems.) If only one channel is being used, set the unused channel’s standby switch to the off (“0”) position.
9 INPUT SENSITIVITY:
Hi = -10dB This is the most frequently used setting.
Lo = 0dB Use for high signal levels such as “slaving.”
MODEL NUMBER: This is important information for reference.
SERIAL NUMBER: This is important information for servicing.
FAN: The fan’s speed is controlled by the front-panel switch. Keep the area around the fan and cooling vents
clear at all times.
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