User Manual - T

User Manual - T
on your purchase of the T-Rex Replicator Junior!
Built on the same principles as its bigger brother, the Replicator Junior offers a bare-bones feature set in a smaller enclosure while keeping the same sonic performance, in all its analog, mechanical and magnetic glory.
A tape echo works by recording and playing back audio on magnetic tape loop run by a motor.
The time it takes for the tape to go from the record head to the playback head will determine
the delay time. A feedback circuit sends the delayed audio back to the recording head for multiple repetitions that fades over time.
On a tape echo, the delay time can be shortened by either turning up the motor speed or placing the playback head closer to the record head. Longer delay times require a slower motor
speed or longer distance between the record head and the playback head.
Delay level: This controls the level of the delay(s). At the maximum setting, the delays will
have appr. the same level as the dry signal (depending on the setting of the Saturation knob).
Feedback: : This controls the amount of repetitions of the delay. When set to minimum only
the first delay will be heard. At high settings, the Replicator Junior’s repeats will self-oscillate.
Note!: Self-oscillation will occur at different settings, depending on how fast the tape is running/delay time settings.
Delay time: This controls the speed of the motor, and thereby the delay time. The max/min
delay time available is: 350ms – 1340ms.
On/off: This switch bypasses the effect, using a relay in a true bypass config. This means that
when the pedal is off, the incoming signal is routed straight to the output jack.
Tap Tempo: This switch is used for tapping in a delay time with your foot. Tempos outside of
the min/max-values for the delay time will be ignored.
Kill dry: This switch will mute the direct signal when pushed IN.
Note!: The direct signal will still be output when the pedal is bypassed, due to the true bypass
Saturation: Controls the recording level of the record head. Depending on how strong the
incoming signal is, the record head can be driven into saturation when this control is turned
up. Lower settings will give you the cleanest/loudest effect signal with the least amount of
noise. Higher settings will make the repeats more compressed, overdriven and fuzzy, with
added harmonic content.
Note!: Although the Replicator Junior can handle very loud input signals, the recording head
will saturate sooner, the louder the input signal is. If the optimal dry/effect-signal ratio cannot
be obtained, turn down the input signal to the pedal.
Input: Connect your signal source (instrument/mixer send/fx loop send/etc.) to this jack.
Output: Connect your amplifier/mixer return/fx loop return/etc. to this jack.
Power jack: Connect the supplied adaptor to this jack.
The Replicator Junior’s moving parts as well as the tape heads WILL need a bit of cleaning
every once in a while. If the unit is used on a regular basis, the tape cartridge will wear out
faster and the various parts will need cleaning more often. In contrast to older tape echo units,
the Replicator Junior is very easy to maintain and the cartridge can be replaced in seconds.
Replacing the tape cartridge: Turn off the effect (motor stops) and take out the knurled
screw. Pull down the lever below the heads and lift out the cartridge. Insert a new cartridge
while pulling down on the lever. Install the knurled screw and release the lever.
Cleaning the tape heads/roller: Take out the tape cartridge and release the lever. Use a cotton swab dipped in isopropyl alcohol (wipe off any excess liquid on a piece of tissue paper)
and carefully clean the heads where the tape touches them. If the heads are very dirty, you
may do this a few times until the cotton swabs no longer has residue on them.
Clean the roller wheel by turning the pedal on and carefully put a cotton swab dipped in
isopropyl alcohol (wipe off any excess liquid on a piece of tissue paper) up against the wheel
while this rotates. Again, if the wheel is very dirty, do this a few times until the cotton swabs no
longer has residue on them.
Note!: It may be necessary to remove the metal cover before performing the above steps, for
better access to the heads/cartridge.
Adjusting the heads: The heads can be adjusted for optimal sound and performance of the
pedal. This is done by turning the small screw on the lever. If the tape heads are too close
or too far away from the tape reel, the pedal will not perform its best and sound quality is
compromised. Turn the screw clockwise until the delays can no longer be heard, then counterclockwise until the delayes are audible and clear with no “fluttering”. This is easier to do if the
delay level is turned up, the feedback turned down and the kill-dry is set to ON. When adjusting the screw, use small turns and listen carefully, then turn again. It is important to stop turning when the echos are loud and clear. Adjusting the heads too close to the tape can cause
the tape cartridge parts to de-form (and cause a wobbly, vibrato-like sound) so be careful not
to overdo this. Adjustment of the heads is normally not needed at every cartridge replacement
but should be performed if the echos are particularly dark sounding/not audible or you have
excessive flutter in the sound.
Sound quality: As the motor´s speed is increased, so does the high frequency content of the
delays. Conversely, if the motor is running at a slow speed, there will be a high frequency loss.
The Replicator Junior has auto-compensation for this, in order to deliver the best sound quality
at any motor speed (delay time).
However, there will be some treble loss as the delay time approaches maximum. In the old
days, players would hear this when they modified their tape echos by slowing down the (fixed)
motor speed and because the Replicator Juniors works on the exact same principle, so will you.
It is just one of the many quirks that makes a tape echo stand out from other delay designs
and we encourage you to take advantage of this “split personality” by using it musically and
Saturation/delay level: The Saturation knob works like an input level control for the delays
and the Delay level knob works like an output level control, so turning one of them up will
make the delays louder (unless you saturate the record head). If turning the Delay Level up
does not give you enough effect, please check if the Saturation knob is set too low.
Delay time/feedback: You can create various effects by turning these knobs in real-time. For
example, if the feedback is turned to maximum, the oscillation that occurs can be swept up
and down in pitch by the Delay Time knob.
For best results, the feedback should be turned up right after the note(s) you want to oscillate
has been played. If the delays ring out before you turn the knob, the oscillation will be dirtier,
noisier and not as evident.
Input impedance
T-Rex offers a 2-year warranty on all our products. In the unlikely event of a malfunction, please
contact our technical support at [email protected] before sending us the product for
repair. Read more about warranty conditions at
Output impedance (ohm)
About T-Rex
Based in Vejle, Denmark, T-Rex Engineering makes classic and signature effects pedals for the
world’s best musicians. Our approach blends hi-tech innovation with old-world craftsmanship
– always in the service of killer tone.
Current draw @12V DC
EU regulations • Environment protection
T-Rex accepts and follows the regulations and directives issued by the EU. We find these environment protecting regulations very good, and we are happy to follow them.
500K ohm
1K ohm
Power supply (included)
12V DC, center negative
Max. input signal
8,7V p-p (12dBu)
External connectors
Input, output, DC inlet
Delay time, feedback, delay level,
saturation, kill dry
Pedal size incl. knobs (WxHxD)
8 x 17,4 x 17,5 cm / 3,15 x 6,85 x 6,89 in
Weight excl. packaging
1,45 kg / 51,15 oz
Made by T-REX Denmark, 2017
1 st edition 2017
Lars Dahl-Jørgensen
Sebastian Jensen
T-Rex Engineering ApS
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