Power / ground – Directed Electronics Tube Driver System TD275/2150 User Manual
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W a r n i n g !
To prevent a short to ground, disconnect the negative (-) terminal of the system’s
battery before you begin. If the power cable shorts to ground, current will continue
to flow until the short is opened, the main fuse blows, the battery explodes, or the
wire melts.
R e c o n n e c t t h e t e r m i n a l o n ly a f t e r yo u m a k e a l l c o n n e c t i o n s .
G r o u n d i n g
Your T UBEDR I V E R is designed to operate from a car’s positive 12 volt, negative
ground electrical system. The ground wire should be the same gauge as the power
wire indicated in the chart.
The main power cable should run from the amplifier location, through or under the
vehicle, to the battery. You must use a grommet wherever the cable passes through
a steel panel to prevent an eventual short to ground.
The ground connection is the most important part of any installation. If the
connections are poor and/or the resistance is high, the resulting drops in voltage
will rob you of amplifier power and may allow noise to enter your system. Your new
Tube Driver features a fully regulated power supply. It will make full power even if
the voltage changes. It will draw more current at lower voltages to make that power.
Lower voltage and high cable resistance means more total current draw. Using a
digital multimeter (DMM), try to get cable resistance as low as possible. If resistance
is too high, use a larger gauge wire. Try to ground your system to a single point in
the vehicle. In larger systems, use distribution blocks and run both power and ground
cables directly to the system battery.
R e m o t e T u r n - o n
IMPORTANT! Your new Tube Driver is equipped with our unique tube warm-up
circuit. When your system is turned on, The LED labeled “WARM UP” will
illuminate and full power is applied to the tube heaters for approx. 35 seconds.
The internal fan will then turn on and two seconds later the amp outputs will
be switched on. The system will then play as normal.
You must connect a wire to the remote (REM) terminal (located in the speaker
terminal plug) of your amplifier to power on your T UBEDR I V E R . The source unit
normally provides a remote amp turn-on or power antenna lead that provides this
+12 volts when you turn on the unit.
•
Run a wire from the chosen turn-on lead to the REM connection
of your T UBEDR I V E R (See Endpanel Layout: Page 10)
•
Tighten the connection