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MMXV AD
User Manual
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Electric Signal MMXV AD User Manual

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Electric Signal
MMXV AD
User manual
Delta Transconductance
band Compressor
Electric Signal 2016 - Revision Alpha
Delta Transconductance band Compressor
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
Page 3
Delta Transconductace band Compressor User Manual
Page 4
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
Page 5
Delta Transconductace band Compressor User Manual
Page 6
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.
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Delta Transconductace band Compressor User Manual
Page 8
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
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Delta Transconductace band Compressor User Manual
Page 10
III.
5
Output stage balance/
This procedure is equal to the delta mu gain stages; if an inbalance is measured at pin 7 and 8, the balance needs to be recalibrated. The balance pots are next to the 6h30 tubes. (see visual below)
measurement
III.
6
There is a possibility that an imbalance may exist between the levels low/mid/high and left/right. These imperfections can be set properly by adjusting the level trim-pots. They can atttenuate 2.5dB.
Level
level
left balance
right balance
IV
The next chapters describe how the machine can be used. Due to the high amount of controls, compared to other compressors, the front panel may be a bit overwhelming, but is actually simple if familiar. Remember there are three elements: Main, filter and compressors. The controls for the compressors are arranged in a matrix. This matrix is present in the whole front panel design exept for the filter and main section. The controls for the filters are divided in two sections, because there are two crossover frequency’s. Furthermore all secondary functions are engraved in red and all controls (besides the calibration trim-pots) operates the left and the right channel. As mentioned before, due to the relative large number of operations and the axiom; ‘a shorter signal pad is in most cases better’ the Delta Transconductance band Compressor uses more than 100 signal relays and they may give a light ‘clicking’ sound if a control is used.
On the next page there is a visual of the block chain of the machine. In the manual and on the front panel, the three compressors of the machine will be defined by high, mid and low channel. Once the filter is bypassed this definition (high, mid, low) it may partially loose it’s meaning, so for example; bypassing the low pass filter of the high to mid section resulting in the ‘high’ compressor working over the whole (20hz­20kHz) frequency range.
Using the system
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Delta Transconductace band Compressor User Manual
Page 12
I V. 1
Block chain
of system
Input
transformer
Main input
-∞
Input gain
Gain reduction
Input gain
Gain reduction
level
Balance
leds
measurement
level
Balance
leds
measurement
voltage
controlled amp
Meter zero Balance Attack time Release time
voltage
controlled amp
Meter zero Balance Attack time Release time
Side chain
0.1
0.01
0.6
0.04
0.3
0.05
0.8
0.08
1.0
0.10
1.5
0.13
4.0
100 130
0.1
0.6
0.3
0.8
1.0
1.5
4.0
100 130
34
20 50
34
20 50
Side chain
0.2
1.2
0.5
1.5
0.8
1.8
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
0.8
1.8
Threshold Stereo link
Threshold Stereo link
mono
link
mono
link
High mute Recovery gain
-∞
High mute Recovery gain
Σ
Audio signal
Control signal
Main output
-∞
Main mute
output
transformer
On
XLR Input
Filter
System bypass
Input gain
Gain reduction
-∞
level
Balance
leds
measurement
voltage
controlled amp
Meter zero Balance Attack time Release time
Side chain
0.1
0.6
0.3
0.8
1.0
1.5
4.0 34
20 50
100 130
Page 13
High mute Recovery gain
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
0.8
1.8
Threshold Stereo link
mono
link
Delta Transconductace band Compressor User Manual
XLR Output
Page 14
I V.
2
Control Matrix
IV.
2.1
Input Gain
Behold the following visual: This is a manipulated image from the front panel; the control, main and the filter section are edited out. What is left is an empty matrix.
High
Mid
Low
Input Gain (dB)/ stereo link
Attack time (ms)/ time adder
Recovery time (s)/ time adder
Threshold (dBu) Recovery gain
(dB)/mute
The controls are arranged in that matrix:
off
on
off
on
off
on
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
0.8
1.8
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
0.8
1.8
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
0.8
1.8
Recovery time (s)/ time adder
31
0 5
-2
-8
off
on
off
on
off
on
out
31
0 5
-2
-8
out
31
0 5
-2
-8
out
Threshold (dBu) Recovery gain
6
3
7
0
9-6
-3
14
-6
6
3
7
0
9-6
-3
14
-6
6
3
7
0
9-6
-3
14
-6
(dB)/mute
Mid
High
Low
12
9
6
3
0
-3
12
9
6
3
0
-3
12
9
6
3
0
-3
Input Gain (dB)/ stereo link
mono
link
mono
link
mono
link
0.1
0.6
0.3
0.8
1.0
1.5
4.0 34
20 50
100 130
0.1
0.6
0.3
0.8
1.0
1.5
4.0 34
20 50
100 130
0.1
0.6
0.3
0.8
1.0
1.5
4.0 34
20 50
100 130
Attack time (ms)/ time adder
This Control is an 11 position rotary switch, and controls a relay based attenuater with a resolution of 1.5dB per step. Together with the Threshold control this defines the slope and the threshold of the compression curve.
IV.
The attack control determines the speed with which the compressor attacks a level above the threshold point. It also determines the ratio of action the compressor will have on short duration spikes and transients.
Gain
Calibration
reduction
IV.
It determines the time-rate of compression holding action. Increasing the control clockwise lengthens the holding time.
IV.
0.2
9
9
9
0
-0.5
level
-1
-2
-3
mute
l e f
on
t
mute
l
on
e f t
mute
on
Gain reduction
bal
-20
r i g h t
0.2 0
-0.5
-1
-2
-3
-6
-8
-10
-14
-20
r i g h t
0.2 0
-0.5
-1
-2
-3
-6
-8
-10
-14
-20
l e f t
level
zero
bal
level
zero
bal
Calibration
r
i g h
t
zero
-6
-8
-10
-14
The threshold control is used to adjust the amount of compression in conjunction with the input gain. With the control in the full clockwise position (out), there will be no compression. Turning the control anti-clockwise increases the amount of compression.
IV.
This Control is an 11 position rotary switch and controls a relay based attenuater with a resolution of 1.5dB per step. Besides amplefying the signal after compression, this control can be
used to mix the low, mid and high band together.
2.2
2.3
2.4
2.5
Attack time
Release time
Threshold
Recovery gain
Page 15
Delta Transconductace band Compressor User Manual
Page 16
IV.
2.6
Stereo link
IV.
4
Main output
When switched to “mono”, the amount of compression of the right channel is independent of the left channel. When switched to “link” the control voltage is combined, left and right channel are reduced in gain by the same number of dB.
IV.
Mutes the channel.
IV.3
2.7
Mute
Gain reduction
meters
Six meters, mid, high, low and left.right measure the current trough the remote cutoff valves responsible for the gain reduction/compression and therefore measures the gain reduction. Over time while the tubes age and the conductance of them lowers, the meters may drop. However the bias can be recalibrated if this occurs (see III.3)
24 position rotary switch, controls the output gain, with a resolution of 1 dB per step.
IV.
If the main output rotary switch is turned completelyanti clockwise to the - the output is muted.
IV.
4.1
4.2
Main Mute
Main system
bypass
Removes all the electronics from the signal chain and links the input to the output, see the block chain IV.1.
IV.
11 position rotary switch, controls the output gain, with a resolution of 1dB per step, Notify that this control can effect every compressor in the unit. In combination with the input gain 121
gain combinations are possible
4.3
Main input
Page 17
Delta Transconductace band Compressor User Manual
Page 18
V. 1
Filter
Block chain
high to mid
highpass filter
bp
high
pass
high to mid
highpass filter
bp
high pass
high to mid
lowpass filter
Bypass
On
high to mid
highpass filter
order
6 dB
/oct
12 dB
/oct
high to mid
order
1st order
2nd order
6dB/oct
high pass filter
1.0k
3.8k 4.8k
Crossover frequency
-3dB fc
1.5k
1.2k
6.2k 8.0k 10k 14k
high to mid
-6dB fc
12dB/oct
high pass filter
2.3k
1.8k
High
output
Phase
inverter
3.0k
Bypass
Filter intput
high to mid
highpass filter
Audio signal
Control signal
Filter I/O
On
Bypass
high to mid
highpass filter
order
-6dB fc
2nd order
-3dB fc
1st order
low pass filter
2nd order
low pass filter
mid to low
highpass filter
bp
high pass
mid to low
highpass filter
bp
high pass
mid to low
lowpass filter
mid to low
highpass filter
On
On
Bypass
1st order 1st order
mid to low
highpass filter
order
6 dB
/oct
12 dB
/oct
mid to low
order
mid to low
highpass filter
order
1st order
2nd order
2nd order
6dB/oct
high pass filter
1.0k
3.8k 4.8k
Crossover frequency
-3dB fc
1st order
low pass filter
-3dB fc
1.5k
1.2k
6.2k 8.0k 10k 14k
mid to low
-6dB fc
12dB/oct
high pass filter
2.3k
1.8k
2nd order
low pass filter
Mid
output
3.0k
-6dB fc
Low
out put
Phase
inverter
Page 19
Delta Transconductace band Compressor User Manual
Page 20
V.
2.1
filter setting
high to mid 6dB/oct - mid to low 6dB/oct
Bode plot’s of
-
high to mid hp:on lp:on mid to low hp:on lp:on
high to mid hp:on lp:on mid to low hp:on lp:off
high to mid hp:on lp:on mid to low hp:off lp:on
high to mid hp:on lp:off mid to low hp:on lp:on
high to mid hp:on lp:off mid to low hp:on lp:off
high to mid hp:on lp:off mid to low hp:off lp:on
high to mid hp:off lp:on mid to low hp:on lp:on
high to mid hp:off lp:on mid to low hp:on lp:off
high to mid hp:off lp:on mid to low hp:off lp:on
high to mid hp:off lp:off mid to low hp:on lp:on
high to mid hp:off lp:off mid to low hp:on lp:off
high to mid hp:off lp:off mid to low hp:off lp:on
high to mid hp:on lp:on mid to low hp:off lp:off
mid to low
crossover
frequency
high to mid crossover
frequency
high to mid hp:on lp:off mid to low hp:off lp:off
Page 21
high to mid hp:off lp:on mid to low hp:off lp:off
Delta Transconductace band Compressor User Manual
high to mid hp:off lp:off mid to low hp:off lp:off
Page 22
V.
2.2
filter setting
high to mid 12 dB/oct - mid to low 12 dB/oct
Bode plot’s of
-
high to mid hp:on lp:on mid to low hp:on lp:on
high to mid hp:on lp:on mid to low hp:on lp:off
high to mid hp:on lp:on mid to low hp:off lp:on
high to mid hp:on lp:off mid to low hp:on lp:on
high to mid hp:on lp:off mid to low hp:on lp:off
high to mid hp:on lp:off mid to low hp:off lp:on
high to mid hp:off lp:on mid to low hp:on lp:on
high to mid hp:off lp:on mid to low hp:on lp:off
high to mid hp:off lp:on mid to low hp:off lp:on
high to mid hp:off lp:off mid to low hp:on lp:on
high to mid hp:off lp:off mid to low hp:on lp:off
high to mid hp:off lp:off mid to low hp:off lp:on
high to mid hp:on lp:on mid to low hp:off lp:off
high to mid hp:on lp:off mid to low hp:off lp:off
Page 23
high to mid hp:off lp:on mid to low hp:off lp:off
Delta Transconductace band Compressor User Manual
high to mid hp:off lp:off mid to low hp:off lp:off
Page 24
V.
2.3
filter setting
high to mid 6 dB/oct - mid to low 12 dB/oct
Bode plot’s of
-
high to mid hp:on lp:on mid to low hp:on lp:on
high to mid hp:on lp:on mid to low hp:on lp:off
high to mid hp:on lp:on mid to low hp:off lp:on
high to mid hp:on lp:off mid to low hp:on lp:on
high to mid hp:on lp:off mid to low hp:on lp:off
high to mid hp:on lp:off mid to low hp:off lp:on
high to mid hp:off lp:on mid to low hp:on lp:on
high to mid hp:off lp:on mid to low hp:on lp:off
high to mid hp:off lp:on mid to low hp:off lp:on
high to mid hp:off lp:off mid to low hp:on lp:on
high to mid hp:off lp:off mid to low hp:on lp:off
high to mid hp:off lp:off mid to low hp:off lp:on
high to mid hp:on lp:on mid to low hp:off lp:off
high to mid hp:on lp:off mid to low hp:off lp:off
Page 25
high to mid hp:off lp:on mid to low hp:off lp:off
Delta Transconductace band Compressor User Manual
high to mid hp:off lp:off mid to low hp:off lp:off
Page 26
V.
2.4
filter setting
high to mid 12dB/oct - mid to low 6dB/oct
Bode plot’s of
-
high to mid hp:on lp:on mid to low hp:on lp:on
high to mid hp:on lp:on mid to low hp:on lp:off
high to mid hp:on lp:on mid to low hp:off lp:on
high to mid hp:on lp:off mid to low hp:on lp:on
high to mid hp:on lp:off mid to low hp:on lp:off
high to mid hp:on lp:off mid to low hp:off lp:on
high to mid hp:off lp:on mid to low hp:on lp:on
high to mid hp:off lp:on mid to low hp:on lp:off
high to mid hp:off lp:on mid to low hp:off lp:on
high to mid hp:off lp:off mid to low hp:on lp:on
high to mid hp:off lp:off mid to low hp:on lp:off
high to mid hp:off lp:off mid to low hp:off lp:on
high to mid hp:on lp:on mid to low hp:off lp:off
high to mid hp:on lp:off mid to low hp:off lp:off
Page 27
high to mid hp:off lp:on mid to low hp:off lp:off
Delta Transconductace band Compressor User Manual
high to mid hp:off lp:off mid to low hp:off lp:off
Page 28
V.
3
Filter
V.
3.2
Lp bypass
In general, the filter splits the signal in a low, mid a high band. furthermore the filter settings enables the user to enables/bypass filters and sets the order or bypass all the filters to enable paralell compression. The next subjects besides cross over frequency discribes one of the two filter sections but they work equally.
V.
3.1
Paralell compression
New York compression, mowtown compression or parralell compression is one or more compressors working paralell on the same material and later mixed together. Often, a heavy compressed signal is combined with an ligtly or uncompressed signal. The filter bypass function makes it possible to change from a band compressor to a set of three stereo compressors configured in paralell, wich enables paralell compression.
The bode plot’s in the prevous chapters indicates that if the machine is set as three paralell compressors, the order and filter crossover frequency cotrol has no function, see for example the right bottom bode plot (V.2.1-V.2.1)
V.
3.1
Crossover frequency
Activates or bypasses the lowpass filter, see V.2.1 to V.2.4
V.
3.3
Activates or bypasses the highpass filter. see V.2.1 to V.2.4
V.
3.4
This cotrol defines the rollof slope, choose beteween first order(6dB/oct) of second order (12dB/oct). The first order filter crossoverpoint is at -3dB. And the second order filter is -6dB.
Hp bypass
Order
See V.2.1and V.1, Controls the crossover frequency of the low passfilter and the highpass filter. Notify the frequency multiplier switch(1x white or 4x red) so Twelve cross over frequency values can be set,
Page 29
Delta Transconductace band Compressor User Manual
Page 30
VI.
Tubes for replacement can be obtained from our factory. The Delta Transconductance band compressor uses the following thermionic tubes:
12X 6ba6/5749/6k4p Compression 3X 6H30 Input/output 2X 6H2p(-ev/-er) Mixing 4X 12AT7/ECC83 PI/tonecontrol
1
Tube complement
VI
.2 Replacing the tubes
6h2p
Notify that the remote cutoff tubes, responsible for the compression(6ba6/5749/6k4p) need to be matched pairs. The 5749W (wich comes with the compressor) is an joint Army Navy electron tube from General Elecric.
The two 6h30 for the output need to be matched triodes.
The Delta Transconductance band compressor comes with two russian milspec 6h2p-er, responsible for mixing, if desired to use an european ecc81or an nowadays 12ax7 make use of a ecc to 6h2p socket (contact electric signal for more information)
Not every ECC83 is usable due to the maximum rating specifications, contact electric signal for more information.
See next subject for tube replacement.
6h30
ecc81/12at7
6ba6/5749/6k4p
To remove a tube, press the screening can down and twist anti-clockwise, when it will spring out. Then remove the tube by pulling upwards, possibly using a cloth if it’s still hot. Take care not to bend the pins when putting back in.
Page 31
Delta Transconductace band Compressor User Manual
Page 32
VII.
Electric Signal reserves the right to alter specifications without prior notice. Electric Signal cannot be held responsible for any damage resulting in using the Delta Transconductace band Compressor.
VII.
The unit comes with a 24 month warranty covering parts and labor, It is essential that it is returned to our factory or to the dealer from which it was purchased for repairs to be carried out otherwise the warranty is invalidated. Contact Electric Signal how to send it to us.
1
2
Disclaimer
Warrenty
VII
Power consumption
Frequency responce
Input impedance
Output impedance
Signal to noise
Operating voltage
Attack time
Release time
Specifications
15k
Weight
THD
600
>80dB
200Watt max
12kg
240vac/130vac
0,1%
-1dB 12Hz-30KHz
0,1-130ms
10ms-1s
Page 33
Delta Transconductace band Compressor User Manual
Page 34
IX
Edison Effect
X
Declaration of
Confirmity
Edison Effect or Thermionic emission:
Thermionic emission is the thermally induced flow of charge carriers from a surface or over a potential-energy barrier. This occurs because the thermal energy given to the carrier overcomes the work function of the material. The charge carriers can be electrons or ions, and in older literature are sometimes referred to as "thermions". After emission, a charge that is equal in magnitude and opposite in sign to the total charge emitted is initially left behind in the emitting region. But if the emitter is connected to a battery, the charge left behind is neutralized by charge supplied by the battery as the emitted charge carriers move away from the emitter, and finally the emitter will be in the same state as it was before emission.
The classical example of thermionic emission is the emission of electrons from a hot cathode into a vacuum (also known as thermal electron emission or the Edison effect) in a vacuum tube. The hot cathode can be a metal filament, a coated metal filament, or a separate structure of metal or carbides or borides of transition metals. Vacuum emission from metals tends to become significant only for temperatures over 1,000 Kelvin The science dealing with this phenomenon has been known as "thermionics", but this name seems to be gradually falling into disuse.
The Delta Transconductance band Compressor complies with the requirements of Conformité Européenne.
XI
Contact details
www Electricsignal.eu @ info@electricsignal.eu Phone 0031640237096
Leiden, Netherlands 2332PZ
Electric Signal
Page 35
Delta Transconductace band Compressor User Manual
Page 36
XII
Recall sheet
Delta Transconductance Band Compressor
High
Mid
Low
12
9
6
3
0
-3
12
9
6
3
0
-3
12
9
6
3
0
-3
Input Gain (dB)/ stereo link
mono
link
mono
link
mono
link
0.1
0.6
0.3
0.8
1.0
1.5
4.0
34
20
50
100
130
0.1
0.6
0.3
0.8
1.0
1.5
4.0
34
20
50
100
130
0.1
0.6
0.3
0.8
1.0
1.5
4.0
34
20
50
100
130
Attack time (ms)/ time adder
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
off
0.8
1.8
on
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
off
0.8
1.8
on
0.01
0.04
0.05
0.08
0.10
0.13
0.2
1.2
0.5
1.5
off
0.8
1.8
on
Recovery time (s)/ time adder
0 5
-2
-8
off
on
0 5
-2
-8
off
on
0 5
-2
-8
off
on
Threshold (dBu) Recovery gain
1.5k
1.0k
31
7
9-6
14
out
31
7
9-6
14
out
31
7
9-6
14
out
9
6
3
0
-3
mute
-6
on
9
6
3
0
-3
mute
-6
on
9
6
3
0
-3
mute
-6
on
(dB)/mute
1.2k
3.8k 4.8k
bp
high pass
High to mid
6080100 130 180 240
300 370
bp
high pass
Mid to low
Crossover frequency (Hz)/filter settings
2.3k
1.8k
6.2k 8.0k 10k 14k
12 dB
/oct
bp
low
6 dB
pass
/oct
450
530 660
12 dB
/oct
bp
low
6 dB
pass
/oct
3.0k
1x
4x
800
1x
4x
0.2
-2.5
-12
-15
-20
r
l
i
e
g
f
h
t
t
0.2
-2.5
-12
-15
-20
r
l
i
e
g
f
h
t
t
0.2
-2.5
-12
-15
-20
Gain reduction
0
-8
0
-8
0
-8
Calibration
Bal measurement
-10
Calibration settings
behind this panel
-16
-18
Main Calibration
settings
behind this panel
-4-6
-8
Input (dB)/ system bypass
-10-12
-14
-20
-∞
0
-22
Output (dB)
Main
Power
-2
0
bp
on
-8
-6
-4
-2
Electric Signal
MMXV AD
Page 37
Delta Transconductace band Compressor User Manual
Page 38
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