WesAudio Beta 76 Manuale utente
WesAudio
www. W e s A u d i o . c o m
ßeta 76
LIMITING AMPLIFIER
Copyright 2014 by WesAudio
User manual
EN
The art of sound
Thank You for purchasing WesAudio beta76.
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INTRODUCTION
With kind regards,
Radoslaw Wesolowski
- a single channel transformer balanced FET compressor/limiter
WesAudioBeta76
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The entire system operates in class A. The element responsible for the gain reduction is a FET
transistor, giving the effect of rapid and pure compression. There is a high quality Carnhill
audio transformer on the output favourably affecting the final sound of the compressor.
The housing is made from high quality brushed stainless steel, whereas the panel is 4mm
brushed aluminium.
A True Bypass switch was introduced, as well as a high-pass filter in the Compressor's Side
Chain path.There are three cutoff frequencies - 60, 90, 150 Hz - thanks to which Beta76 is
less sensitive to low frequencies. The filter is particularly beneficial to the operation of two
compressors in a stereo pair, which are easily connected with a prepared Jack-Jack cable.
WesAudio Beta76 is a continuation of WesAudio 1176 compressor. The introduction of several
significant structural improved the original version. One of the most important changes is two
mode switch - Modern / Vintage - deciding on the circuit of the desymmetrization of the input
signal.
Modern Mode
- is an electronic circuit, exactly the same as the previous version of the compressor and
the Vintage mode - it's a Carnhill input transformer. The result is a universal device with two
different sound possibilities.
FRONT PANEL
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Front Panel
Input – Determines the level of the input signal entering the 1176, as well as the threshold.
Higher settings will increase amounts of compression or limiting.
"0" Adjust – Screwdriver adjustment accessible through a hole. For property adjustment see page 3.
Output – Determines the level of the output signal leaving the 1176.
It is used to recover compression lost signal.
Attack – It sets the Attack time from 20 microseconds to 800 microseconds. The attack time
is fastest when the Attack knob is in fully clockwise position, and it's slowest when it's in its fully
counterclockwise position. Pulling the knob will activate "stereo link function".
Release – It sets the Release time from 50 millisecond to 1100 milliseconds.
The release time is fastest when Release knob is in its fully clockwise position, and is slowest
when it is in its fully counterclockwise
SC Filter/Link – this button determine three side-chain hi-pass filter frequency (60Hz,90Hz,150Hz)
and also activate/deactivate Link function by pressing it for 2sec.
Input mode – pressing this button you can switch between two input circuits :
Vintage – transformer balanced input, Modern – IC based input circuit.
Ratio - This buttons determines deepness of the compression and limiting. A ratio 4:1 is the smaller
possible value of compression, while 20:1 is larger value of limiting. 8:1 is the last button when
compression occur, after that, is only limiting. Pressing all four buttons simultaneously, will activate
'slam' mode, which is extreme hard form of limiting.
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FRONT PANEL
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Rear panel
· Voltage switch selector 115V/230V
· Mains power inlet connector and fuse holder
LINK - stereo mode compressors connector
(special cable is needed for this operation, see page 6)
XLR Balanced audio output connector
XLR Balanced audio input connector
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Warning! Choosing the wrong voltage can damage compressor!
Before connecting, make sure the correct voltage has been selected!
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Meter – A standard VU meter that displays either the amount of gain reduction, or output level,
depending upon the setting of the Meter Function switch.
Meter Function – Pressing the off button will disable entire 1176. Another three buttons determine
what the 1176 front panel VU meter displays: GR – gain reduction or +8 or +4 – output level that
corresponds to the value '0' on the VU meter.
REAR PANEL TYLNY
Linking compressors
To link two compressors to work in stereo mode you need special Jack-Jack cable.
You can purchase it at WesAudio or you can do it yourself as it is shown below:
Zero Set
The 1176LN meter may occasionally need to be calibrated. This is accomplished by adjusting the
Zero Set potentiometer, located through a small hole on the front panel between the Input and Output
Cut if hum appear
Link connection
MAINTENANCE
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It is recommended to switch on device at least 5 min before operating to ensures best parameters.
NOTE! The device should be connected only to a ground outlet and proper voltage
Always replace the fuse with the type and value recommended by manufacturer.
230V - IEC 127 20x5mm T315mA
115V - IEC 127 20x5mm T630mA
Warning! High voltage inside ! To reduce the risk of electrical shock do not open the unit.
Installation
The procedure for adjusting the meter is as follows:
1. Power on the beta76 and wait 15min.
2. Press the Meter GR pushbutton.
3. Set the Input control fully off (turn the knob fully counterclockwise).
4. Use a small screwdriver to slowly adjust the Zero Set potentiometer so that the meter reads 0 dB.
Watch how the meter settles before completing the calibration.
CONNECTION
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Balanced XLR connection
Balanced Jack-XLR connection
Beta76
Beta76
Beta76
Beta76
RECALL SHEET
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SPECIFICATION
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2.4 Kohm
600ohm
(+/-1dB)20Hz do 20kHz:
< 1 %
> 83dB
43dB
230V AC / 115 V
Time-lag 315 mA/230V (630mA/115V)
Rack 2U
6kg
88 x 483 x 235 mm
3 years
Input impedance :
:Output impedance
Frequency response:
THD+N :
SNR :
: Gain
AC mains
Fuse:
Case :
Weight :
Dimensions :
Warranty :
Specifications:
WesAudio
www. W e s A u d i o . c o m
Copyright 2014 by WesAudio
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