User Guide

Note: The shorting link between chassis ground and signal ground should be left installed, unless another
grounding scheme is used.
1/4 Inch Anchor Bolt
We have provided a 1/4” anchor bolt on the rear panel of the 786 to aid in securing the unit in your
rack. Since the 786 is a heavy unit, we recommend securing the 786 to a rear rack rail to avoid unnec-
essary stress on the front panel and front rack rails of your rack. The anchor bolt provides no electrical
or audio benefit to the 786, and no grounding or electrical wires should be connected to it.
AC Power Switch
Located beside the AC Power connector, the AC Power switch turns the 786 ON and OFF. When the
switch is in the DOWN position, revealing the red portion of the switch, the AC power to the 786 is ON.
When the switch is in the UP position, no AC power is being supplied to the 786, regardless of other
power connections.
AC Power Connector
The AC Power connector is a standard IEC 320 power inlet receptacle, for use with any IEC-type power
cord (included with the 786). Connect this cable to any 50Hz or 60Hz AC power source of the correct
line voltage for your area. Make sure this voltage is also correct for the voltage marked on the back of
the 786. Always make AC power connections with the AC power switch in the OFF position (see above).
The 786 consumes a maximum power of 50 watts.
Warning:
Be sure to verify both your actual line voltage and the voltage for which your 786 is wired, as indi-
cated on the back panel of the unit. Connection to an inappropriate power source may result in exten-
9
controls
Operating
786
2
1
3
Jensen¨ 
Output 
Transformer
Jensen
¨ 
Output 
Transformer
10k 1W
GND
Switch
GND
Switch
BALANCED FLOATING OPERATION UNBALANCED FLOATING OPERATION
Chassis
Ground
Chassis
Ground
Chassis
Ground
Ground Switch open
Unbalance Switch open
Ground Switch open
Unbalanced Switch closed

(6dB drop in output level)
Jensen¨ 
Output 
Transformer
Jensen
¨ 
Output 
Transformer
10k 1W
GND
Switch
GND
Switch
BALANCED GROUND-
REFERENCED OPERATION
UNBALANCED GROUND-
REFERENCED OPERATION
Chassis
Ground
Chassis
Ground
Ground Switch closed
Unbalance Switch open
Ground Switch closed
Unbalance Switch closed

(6dB drop in output level)
+
-
+
-
+
-
+
-
2
1
3
Chassis
Ground
2
1
3
Chassis
Ground
2
1
3
Chassis
Ground
Figure 5: Ground/Unbalance switch operation.