Crane Song Syren Bedienungsanleitung
LTD.
2117 East 5th Street
Superior,WI 54880 USA
tel:715-398-3627
fax: 715-398-3279
www.cranesong.com
OPERATOR'S MANUAL
Version 1.0
20160917
© 2014 Crane Song, LTD. Subject to change without notice. Printed in the U.S.A.
1
SYREN
SYREN is a classic sounding tube preamp in a 500 series package, using a dual triode
circuit with a 12AX7 tube
SYREN features a dual gain stage circuit and allows overdrive effects.
A switch selectable HI-z input is included. The low cut filter is at 90 Hz and is 24 db/
octave. The pad has -15 db and -25 db settings to allow a wide input range of signals.
The audio path color is changed by modifying the second stage tube circuit so it has
negative feedback or does not have negative feedback. This changes the interaction
between the tube stages and thus the sound of the pre-amp. With negative feedback
SYREN typically has a more accurate audio path with wider frequency response. Without
negative feedback it has a more open warmer sound. The OPEN setting is more desired
for over drive operation.
Because SYREN was designed for color and not specs the measured values will change
greatly depending on the mode of operation. Turing the negative feedback off may or may
not result in higher harmonic distortion, but will result in different harmonic content. The
changing interaction between the tube stages makes the result difficult to predict. Gain
settings, signal level, signal frequency and source impedance all contribute to the tube
stage interaction.
The over load LEDs start to light at -6db with respect the tube compression or over load.
With a little practice they will become useful in judging the gain settings. The LED’s lighting
a small amount does not mean distortion.
The input LED is an indicator of the drive level to the first stage, the only way to change this
is with the PAD switch or changing the input signal level. The output gain LED is shows the
level of the second tube stage before the OUTPUT GAIN pot. This is affected by the
setting of the INPUT GAIN pot
INPUT GAIN
INPUT OD LED
3 POSITION
PAD
OUTPUT
OUTPUT
GAIN
OUTPUT
OD LED
COLOR SWITCH
LOW CUT FILTER
INPUT
SIGNAL FLOW
PAD 3 POSITIONS
OFF, -15 DB, -25 DB
MIC INPUT ONLY
PHASE REVERSE
CHANGES THE PHASE
OF THE INPUT
FIRST TUBE STAGE
OVER DRIVE LED
STARTS TO TURN ON AT
-6DB FROM SOFT CLIP
SECOND TUBE STAGE
INPUT GAIN
PHANTOM POWER
OFF - ON
OUTPUT GAIN
SELECT HI-z OR MIC INPUT
LOW CUT 90Hz 24 DB / OCTAVE
HI-z INPUT
COLOR SELECTION
IN THE OPEN SETTING
NEGATIVE FEEDBACK IS
OFF, THIS IS GOOD FOR
OVERDRIVE EFFECTSAND
NATURAL TUBE COLOR
IN THE COLOR SETTING
NEGATIVE FEEDBACK IS ON
ON THE SECOND TUBE
STAGE THIS HASA
BRIGHTER SOUND MORE
ACCURATE SOUND
HOWEVER THE FINAL SOUND WILL BE DETERMINED
BY THE SETTINGS OF THE GAIN CONTROLS, THE
COLOR SWITCH AND THE SOURCE IMPEDANCE,
EXPERIMENT A LITTLE. SETTING THE OUTPUT GAIN
TO MAX WILL BE CLEANER, SOFT OVERDRIVE MORE
COLORED.
SPECIFICATIONS
Pad: 0, -15, -25 db steps
Max Gain: 65db
Filter: 90Hz 24 db/oct
Power: 100mA with self resetting fuses
At 40db of gain, 0dbu output and a 150 ohm source
Harmonic Distortion : 0.5% second harmonic
Noise: -84dbu
Frequency Response: 6Hz to 80Khz
Tube: 12AX7B, selected for low microphonics
Lundahl Mu metal shielded transformers for both input and output
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