True to the Music
Radial Engineering Ltd.
Space Heater™ User Guide
3
INTRODUCTION
The Space Heater is a combination 8x2 summing mixer and a bad-
ass 8-channel harmonic distortion device that lets you add a little,
more, or a lot of distortion to your signal path. In some situations
you may
fi
nd that adding just a bit of bite to a vocal track can bring
out subtleties without adding a compressor or increasing level. On
acoustic guitar, the natural compression of a distorted tube circuit
can enhance harmonics that may otherwise be lost. On bass, a
medium distortion will bring back the vintage tone and feel as if
connected to an old SVT or Marshall bass amp. And with drums,
you can add crunch to expand the size of the drums without over-
processing.
Because the Space Heater can be used in a number of ways, it
is important to understand its architecture and signal
fl
ow. It is
equipped with four 12AX7 tube drive circuits wired in stereo. While
you do have separate DRIVE and LEVEL controls on each channel,
certain functions are shared across both sides of the tube. Lets get
started...
POWER
The Space Heater employs a universal power supply that accepts all
voltages from 100V to 240V. This in-line power supply is equipped
with a standard IEC/EIN power input so that you only need to
change the cable to suit the local power connector types. A locking
5-pin XLR connects the external power supply to the Space Heater.
At the far right hand side of the front panel is a power switch. We
recommend that you keep the Space Heater turned off when not in
use to prolong tube life and save power. Turn the Space Heater on
at least 15 minutes before use to allow the tubes to achieve thermal
stability and maximum performance.
INSTALLING THE SPACE HEATER
The Space Heater can be mounted in a standard 19-inch rack
system or placed on the desktop using the included adhesive-
backed feet. As it is a tube device, the Space Heater generates quite
a bit of heat. Passive ventilation on the top and sides of its enclosure
are provided to help dissipate heat build-up. When rack mounting,
we recommend leaving at least one space open above the Space
Heater for ventilation. Keep other sensitive equipment away from
the Space Heater if temperature is a concern and always power the
unit OFF when not in use to prolong tube life.
The Space Heater is 19” (48.3cm) wide, 7” (17.7cm) deep, and
one standard vertical rack space (1.75”/4.5cm) tall. The total rack
depth required for installation is 11” (28cm) to accommodate rear
panel cable connectors. It is a good idea to provide some means
of support and strain relief for the cable bundle connecting to the
rear panel.
SIGNAL LEVELS
Before making connections, always reduce signal levels or turn
off audio equipment. This helps prevent turn on and connection
transients from damaging more sensitive components such as
tweeters. All controls on the Space Heater should be turned fully
counter-clockwise and all channels and tube drive circuits should be
turned off (ON switch in out position) before using for the
fi
rst time.
NOTE: Changing the HEAT voltage setting will change signal levels
slightly. Be prepared to reduce the level when changing the HEAT
switch to higher voltages.
EXTERNAL POWER SUPPLY
11”
9”
Channel 1
Channel 1
Channel 2
Channel 2
<OPEN RACK SPACE OR VENT PANEL>
Содержание space heater
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