LCA 2B - Dual Channel Tube VCA Compressor
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TUBE-TECH LCA 2B is one of the most versatile and powerful compressors in the market.
The LCA2B is a TUBE VCA compressor It's using a tube as the VCA (voltage controlled amplifier). This kind of compressor is also known as a Vari Mu compressor. There's literally nothing the LCA 2B can't handle; from powerful bus compression to instrument and voice compression. LCA2B is perfect for serious drum compression, due to the very fast and smooth attack of the compressor. ( Check our Video:Parallel Snare Drum Compression ) The action of the LCA2B is always easy to hear, so finding the right setting on this compressor is not complicated. LCA2B is designed to be the TUBE-TECH equivalent of the Fairchild 670. It's NOT the same circuit, but it is designed with the Fairchild in mind, delivering similar action but not loosing the higher frequencies when compressing harder. The fixed attack/release constants are duplicates of the Fairchild constants. When you want even more control, power and wildness than our famous CL1B can deliver, try the LCA 2B. The LCA2B is extremely powerful as a bus compressor, and has furthermore found its use in many top live engineers' touring racks . |
LCA 2B Technical Description and Features
The TUBE-TECH LCA 2B is a two-channel unit with an independent compressor and limiter per channel.
The unit is all tube based (except for the power supply and side chain circuit). The VCA (1 dual triode) is placed between the input transformer and the output stage (2 dual triodes).
The audio signal is picked up after the VCA and fed to the side chain circuit. The control signal from the compressor and from the limiter is combined and sent to the link switch and to the control amp, which feeds the VCA. The two bi-directional link busses are accessible at two 1/4" stereo jack sockets on the rear panel. The channels can be linked together for stereo applications and also linked to other LCA 2B's via the two link busses and a standard stereo jack/jack cord.
The compressor has six att/rel presets ( Fairchild time constants ) as well as manual control. The limiter att/rel is fixed. The LED display is fed from the control amp. The limiter LED is fed from the limiter buffer.The audio path is fully symmetrical from input to output. Input and output have fully floating transformers. All DC voltages are stabilized, except the anode voltage for the output stage.
Compressor
Limiter
General
The unit is all tube based (except for the power supply and side chain circuit). The VCA (1 dual triode) is placed between the input transformer and the output stage (2 dual triodes).
The audio signal is picked up after the VCA and fed to the side chain circuit. The control signal from the compressor and from the limiter is combined and sent to the link switch and to the control amp, which feeds the VCA. The two bi-directional link busses are accessible at two 1/4" stereo jack sockets on the rear panel. The channels can be linked together for stereo applications and also linked to other LCA 2B's via the two link busses and a standard stereo jack/jack cord.
The compressor has six att/rel presets ( Fairchild time constants ) as well as manual control. The limiter att/rel is fixed. The LED display is fed from the control amp. The limiter LED is fed from the limiter buffer.The audio path is fully symmetrical from input to output. Input and output have fully floating transformers. All DC voltages are stabilized, except the anode voltage for the output stage.
Compressor
- Variable ratio from 1,6:1 to 20:1
- Variable threshold: off to 10 dBu
- Selection between six presets and manual controlled att/rel
Limiter
- Variable threshold: off to 0 dBu
- On/off switch
- LED indication
General
- Separate compressor and limiter
- Frequency response @ -3 dB: 5 Hz to 50 Khz
- Low noise: < -85 dBU @ 10 dB gain
- Output gain control
- Clickless bypass relay
- LED display for gain reduction