Electric Signal MMXV AD User Manual
Electric Signal
MMXV AD
User manual
Delta Transconductance
band Compressor
Electric Signal 2016 - Revision Alpha
Delta Transconductance band Compressor
Electric Signal MMXV AD
User manual
Serial
number
a priori
Line voltage
Table of Contents
I
2. Introduction 5
3. Warning 6
1. Thank You 5
V
3.1 Paralell compression
3.2 Crossover frequency
3.3 Lp bypass
3.4 Hp bypass 30
3.5 Order
3. Filter 29
II
2. Heat and ventilation 7
3. Operation voltage 8
III
1. Power 9
2. Balance measurement 9
3. Balance calibration 10
4. Meter zero/bias 10
5. Output stage balance/
measurement 11
IV
1. Block chain of the Machine 13
2. Control Matrix 15
2.1 Input gain 16
2.2 Attack time
2.3 Release time
2.4 Threshold
2.5 Recovery gain
2.6 Stereo link 17
2.7 Mute
3. Gain reduction meters
4. Main output 18
4.1 Main mute
4.2 Main system bypass
4.3 Main input
V
2. Bode plot’s of filter settings
1. Getting Started 7
Powering up the machine
Using the system 12
1. Filter block chain 19
2.1. high to mid 6dB/oct - mid to low 6dB/oct 21
2.2. high to mid 12dB/oct - mid to low 12dB/oct 23
2.3. high to mid 12dB/oct - mid to low 6dB/oct 25
2.4. high to mid 6dB/oct - mid to low 12dB/oct 27
VI
2. Replacing the tubes 32
VII
2. Warrenty
VIII
IX
X
XI
XII
1. Tube complement 31
1. Disclaimer 33
Specifications
Edison Effect 35
Declaration of Confirmity 36
Contact details 36
Recall sheet 37
Electric Signal MMXV AD
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Delta Transconductace band Compressor
User Manual
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I.
1
Thank You
For choosing the Electric Signal Delta
Transconductance band Compressor and trust
in us.
Eletric Signal has the mission to ensure the
professional audio engineer has reliable, high
quality equipment.
By knowing the status quo, annihilating the
dogma’s and standing on a many shoulders,
Electric Signal is always innovating. Pushing the
envelope further and tries to leave the real
decisions for the engineer. By knowing we are
only a switch in the chain we try to achieve to
give the engineer the maximum potential by
providing him the relevant choices.
It is tough to vocolise, however Arthur
Shoppenhauwer writes in ‘the world as will and
reprentation’
“The effect of music is so very much more
powerful and penetrating than is that of the
other arts, for these others speak only of the
shadow, but music of the essence.”
I.2
Introduction
The Delta Transconductance band compressor
is a vacuum tube based three band compressor
and is essentially three stereo compressors, a
three band passive crossover filter and a tube
based mixer
For the compression, the delta mu technology
is used. The 6386 tiode, used in many classic
compressors is ideal for this task, nowadays
difficult to obtain. Therefore the Delta
Transconductance band Compressor uses the
6ba6/5749 penthode in triode configuration and
has the same characteristics as the 6386 triode.
Like all delta mu compressors, balance needs to
be (re)calibrate to cancel out 2nd order
harmonics. Therefore these calibration settings
are on the front panel. To make proper settings
there are sockets on the front panel to measure
the (in)balance.
Furthermore, solid state components are used
in the power supply and the side chain. There are
no integrated circuit's, electrolytes or transistors
in the audio chain. The input and output are
transformer balanced.
The controls on the front panel are toggle
switches or rotary switches, so recall is possible.
These switches control relay based attenuators,
never touch the audio signal directly and
make a short as possible audio chain.
I.3
For personal safety, please read this user
manual and warning thoroughly before using the
equipment. To reduce the risk of electric shock,
it is essential that the unit is disconnected from
the mains supply before removing the cover. The
Delta Transconductance band Compressor uses
thermionic vacuum electron tubes and works on
a lethal voltage up to 300 volts. Even after a
long period of disconnection, components can
still be charged.
Use and store the Delta Transconductance band
Compressor only in studio conditions. Do NOT
operate the Delta Transconductance band
Compressor in a hazardous area, near water
or moisture.
Due the amount of tubes, the Delta
Transconductance band Compressor
generates heat.
However the unit should never run this hot so that
it makes it untouchable. Ensure that adequate
ventilation is provided(see II.2).
In the event that this unit has been suffered an
impact, an electrical safety test must be carried
out before reconnection to the mains supply.
Refer servicing of the unit to qualified personnel
only.
Warning
Electric Signal MMXV AD
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Delta Transconductace band Compressor
User Manual
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II.1
Getting Started
II.3
Operation voltage
The package contains:
-this manual
-the Delta Transconductance band
Compressor
-a power inlet cable
If you’re not sure, control the operating voltage
is the correct one(II.3) While doing so check for
compromised vacuum and broken glass.
Use short XLR cables for input/output where:
pin 1: ground, shield
pin 2: positive phase, hot
pin 3: negative phase,cold
Use the power inlet cable to connect the
equipment with a earthed power source.
Make sure the unit is installed in a rack, with
sufficient ventilation(see II.2) or on a stable flat
surface.
II.2 Heat and ventilation
Due to the amount of tubes the Delta
Transconductance band Compressor uses more
energy than a laptop and therefore generates
significantly amount of heat.
The machine is equipped with a very low noise
noctus fan and had a operation time of 100000
hour. Installed in a rack the unit should be inaudible.
It is recomended to have 1U of space between the
unit and other equipment. Make sure that the
ventilation slots are not obstructed. When rack
mounting this equipment, an external fan may be
required to provide sufficient airflow.
The Delta transconductance band compressor
can operate from 240 vac 50 Hz or 120 vac 60
Hz. The line voltage is set at the factory based
on the buyers request at time of the order.
To change the line voltage, padlock the machine
from mains. The line
voltage switches are located at the back of the
machin. Switch it in the correct
position. Do NOT operate the equipment with
the line voltage switch in the wrong position.
Electric Signal MMXV AD
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Delta Transconductace band Compressor
User Manual
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III
Powering up
the Machine
Now that the Delta transconductance band
Compressor is installed and all connections are
made, it is ready to operate
III.
1
Power
Set the multimeter to mV and connect the wires
of the meter to pin 1and pin 2 of the right D sub
socket, If the multimeter measures anthing other
than 0 volts the balance of this stage is not
calibrated properly. See next chapter for balance
calibration (III.3).
III.
3
Balance calibration
Push the power button:
Now the light in the power button will illuminate, and
the machine generate sa few clicks from the
relays. Now the tubes heat up, inside
them a physical process occures named ‘the
Edison effect’ and electrons will flow into the
micro universe of the tube. The gain reduction
meters measure the current trough the tubes
responsible for the compression and the leds of
the meters will lit up. After 30 to 60 seconds
the machine is ready for operation.
III.
2
Balance measurement
The machine is calibrated in our factory, however
the procedure is as follows. The tubes can drift
directly after the warm up so it is recommended to
leave the unit on for half an hour, before
calibration /measurement. For this procedure is
needed:
-a flat screwdriver
-a (digital) multimeter
Remove the the measurement panel.
Behind the measurement panel there
are two 9pins d-sub sockets, with the
numbering of pins:
5 4 3 2
9 8 7 6
1
Power
5 4 3 2
9 8 7 6
Right
5 4 3 2
9 8 7 6
Left
Pinout
1, 2: High
3, 4: Mid
5, 6: Low
7, 8: Main
9 : Gnd
If an unbalance is measured, second
order harmonics occure. To rebalance
the stage, apply the multimeter to the
correct stage (see III.2) and use the flat
screw driver to adjust the balance
trim-pot until the multimeter indicates
0 volts.
bal
III.
4
Meter zero/bias
While tubes age, their conductance decrease and
therefore the gain reduction meters will indicate
compression. Although this is not immediately a
problem, there is a way to recalibrate the idle
current of the tubes. Use a flat screwdriver to
adjust the zero pot-meter of the desired channel
1
1
(mid, high, low, and left or right) and set the
meter to 0 dB. If thie problem is not solved, a
tube replacement may be necessary. After
altering the bias, it is recommended to re balance
the stage.
level
zero
bal
r
l
i
e
g
f
h
t
t
level
zero
bal
level
zero
bal
zero
Electric Signal MMXV AD
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Delta Transconductace band Compressor
User Manual
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