9
Other Connections
12 V In Jack
The JC 3+ 12 V input is a mono 3.5mm (1/8”) mono mini jack. To trigger the JC 3+ on and off
automatically, insert the trigger wire plug into this jack and plug the other end into your
preamplifier’s 12V trigger output jack. When the JC 3+ Turn On Options switch is set to 12 V
the JC 3+ will turn On and Off with your preamplifier.
Note:
The Model JC 3+ trigger circuit draws a negligible 15mA current from the preamplifier.
12V Loop Out Jack
The Trigger Out jack lets you loop or “daisy-chain” the incoming trigger voltage to another
component.
AC Power Cord
A high quality IEC-type AC power cord is supplied with your JC 3+. Please connect it directly
to an AC wall outlet or power conditioner that is always “live.” If possible, plug your JC 3+ into
the same AC outlet that your line level preamplifier is plugged into. If different AC outlets are
used for the JC 3+ and the preamplifier the ground potential may be higher or lower between
the outlets, resulting in audible hum.
Rear Panel Controls
Turn On Options Switch
For your convenience, there are two ways the JC 3+ can be turned on and off.
Manual
: Use the front panel On-Off button
12 V
: When the Turn On Options switch is set to the 12 V position, the JC 3+ is
turned on and off automatically with an ex9V to + 12V voltage from
your preamplifier. When the external trigger voltage ceases the JC 3+ will turn
off immediately.
Note
: When the Auto Turn On switch is set to 12 V the front panel
On-Off button is disabled.
Illumination Switch
This switch selects if the front panel P logo red illumination is on or off.
AC Polarity Switch
The JC 3+ Polarity switch inverts the “hot” and “neutral” conductors of the incoming AC
power. It does not affect the 3
rd
pin ground connection. In most cases the AC Polarity
switch should remain in its Normal position. Occasionally, the only way to reduce or
eliminate hum when listening with a phono preamp is to invert, or reverse the phase, of the
phono preamp’s hot and neutral conductors.
Note:
Please turn off the JC 3+ and unplug its AC cord before changing
the setting of the AC Polarity switch.
AC Power Switch
This switch is provided to turn the JC 3+ completely off when it will not be used for an
extended time. Normally, this switch is left in the “on” position (upper section is pressed in).
