8. To select one of the RCA inputs on the back of the unit or the iPod interface on the top of the unit, use the Input
Selection knob on the left side of the faceplate. The LEDs around the knob will tell you which input is selected. For
more information on this knob, see page 9.
9. To adjust the volume of your Stingray iTube, simply turn the Volume/Balance knob on the right side of the face-
plate. To adjust the L/R balance, push this knob and hold it in for 2 seconds - then you are in Balance Mode. To exit
Balance Mode and return to Volume Mode, simply press and quickly release the knob. For more information on this
knob, see page 9.
FRONT PANEL
A) Input Selection & Menu Control: This knob displays and allows the selection of any one of the 4 inputs available on
your Stingray iTube. The LEDs show which input is selected, starting at the 9:00 position for Input 1 and ending at the
12:00 position for Input 4 (iPod interface). It also allows access to the Menu functions of the Stingray iTube, including
individual input gain adjustment and remote control modes. For more information on these functions, see page 9.
B) Standby Button: After powering on the unit via the switch on the back panel, this button will remain lit until the
Mute cycle has ended. At that point, pushing this button will turn on the Stingray iTube completely and allow audio to
pass through. To put the unit back into Standby Mode (no power to tubes, no audio signal passing through), simply push
this button again.
C) Volume & Balance Control: This knob displays and controls the volume of the Stingray iTube. Turning it clockwise
increases the volume, and counterclockwise decreases it. Push in the knob for 2 seconds and release it to enter Balance
Mode. To exit Balance Mode, push and quickly release the knob. For more information on these functions, see page 9.
NOTE: The two knobs on the front panel are known as “infinite rotary knobs”. This means they can rotate indefinitely
without ever encountering an “end” to their rotation. Rather than being a normal pot, the knob is actually a Grayhill
encoder that controls a Cirrus digital volume control chip. This chip changes the gain of the signal entering the tube
preamp section. As with the previous version of the Stingray, the Balance Mode reduces the gain of one channel at a time
to control the balance.
BACK PANEL
A) MAINS FUSE COVER: Pry the small slot to move the locking tab towards the fuse cover and it should pop open.
Only use an MDL 3 AMP / 250 Volt SLO-BLO fuse if it needs replacing (MDL 1.5 AMP / 250 Volt SLO-BLO for
220~240 units).
B) POWER SWITCH: Towards the fuse or away from the IEC power cable is
ON (I), towards the power cable is OFF (O). Make sure to power up your
sources first, to avoid any ugly noises from your speakers as your sources
come on. Now it’s Stingray iTube time! After you turn on this switch, the amp
will automatically go into Standby Mode. Press the blue Standby button on
the front panel, and the unit will Soft-Start (audio is muted), and will power
on fully after about 10 seconds. (When you are ready to turn your system off,
powering down should happen in reverse order from stated before - Stingray
iTube first, then everything else.)
C) IEC MAINS SOCKET: This is where the power cable goes. Note that your amp should be wired correctly for your
country. You may want to check the packing box to be sure. Also notice that this is a grounded 3-pin cable. If you get
a hum problem, see page 17 for some simple troubleshooting hints.
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Summary of Contents for Stingray iTube
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