Summit TD-100 Operating Manual
Summit Audio Model TD-100
Instrument Preamp and Tube Direct Box
Operation Manual
Summit Audio, Inc.
P.O. Box 223306
Carmel, CA 93922
(831) 728-1302
email: sound@summitaudio.com
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Introduction
The TD-100 is a single channel direct box and instrument
preamp featuring a hybrid signal path utilizing a solid state
output device and a 12AX7A/ECC83 vacuum tube. This
unique combination of of solid state and vacuum tube technology gives the TD-100 the benefits of both worlds: the high
reliability and long life of solid state and the warm overtones
associated with vacuum tubes. Other great features such as
continuously variable input impedance, polarity switching, and
a headphone output make the TD-100 a great sounding tool
for the studio or the stage. Enjoy!
DANGER!
HIGH VOLTAGE
IMPORTANT: Check
the back panel to make
sure the TD-100 is
configured for the voltage used in your country. This is done at the
factory ONLY.
Features
•
Ease of Operation
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Headphone Output
Variable Input Impedance
Direct Output for easy parallel connections
Balanced Outputs
Hand Crafted in the U.S.A.
Carefully unpack the TD-100 and it’s power cord. Save the
carton and packing material for possible future use. Before
powering up the unit, read this manual and observe the cautions for
HIGH VOLTAGE
.
Model TD-100 Tube Direct Box
2
Front Panel
Front Panel
GRO
UND
POLARITY
SIGNAL
LIFT
+-
DIRECT OUT
INPUT
1M
10K 2M
LOADING
SIGNAL
0
OUTPUT GAIN
Ground Lift Switch
This two-position switch removes the third prong of the
power cable from the circuit. Lifting the ground can sometimes reduce the hum caused by a ground loop in your audio
system.
Polarity Switch
This switch changes the polarity of the outgoing signal.
Direct Instrument Output
This jack mirrors the instrument input. Plug your instrument
into the input and run a line from this ouput to the input on
your amplifier. This output is not affected by the Loading
control.
DRIVE
TUBE DIRECT
INSTRUM
24
TD-100
ENT PRE-AM
ON OFF
P
Instrument Input
Input for your bass, guitar, keyboard or other instrument.
The maximum input level is +24dB.
Model TD-100 Tube Direct Box
3
Front Panel
Loading Control
This knob controls the loading or impedance for the instrument input. The impedance can be set from 10K ohms to
2M ohms.
You can set this control to match the TD-100 to the impedance of your instrument or as a kind of tone control. In practical use you’ll set this control to get the sound you like best.
Signal LED
This green LED lights to indicate a proper level at the input.
Drive LED
This amber LED lights to indicate clipping on the input.
Output Gain Control
This control varies the output gain. The XLR output can be
varied from -20dB to +4dB. The 1/4” TRS output can be
varied from 0dB to +24dB.
(0dB input level)
Power
This switch toggles AC power on and off.
Important - Please Read!
The TD-100 contains a vacuum tube which
generates heat.
Do not block the cooling holes on the top of the
TD-100 and always allow adequate ventilation when
mounting the unit in a rack enclosure.
4
Summit Audio, Inc.
Rear Panel
Rear Panel
FUSE
CLASS A -TUBE INSTRUMENT PRE-AMP
MODEL TD-100 20 WATTS MAX
115V 50/60 HZ
SUMMIT AUDIO INC. CARMEL, CA USA
PHONES
A.C. Receptacle
The TD-100 is factory wired for either 100, 115 or 230
Volts AC. Before connecting AC power make sure the
TD-100 is wired for the voltage used in your country.
Headphone Output
Use the TD-100 as a practice amp by inserting your headphones here. Use the Output Gain control and the instrument’s volume control to control the volume.
1/4” TRS Line Level Output
This is a balanced/unbalanced 1/4” high level output
designed to interface with your recording device, compressor
or EQ without adding a preamplifier. Simply plug in a mono
phone plug to use this output unbalanced.
BALANCED
OUTPUTS
LINE
PIN2+
MIC
XLR Mic Level Output
This is a balanced low level output used for injecting the TD100 into another preamplifier. This is most often used in a
live performance setting. Pin 2 is positive (+).
Model TD-100 Tube Direct Box
5
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