The Tube Tech LCA 2B is an all-tube VCA compressor/limiter with two independent, linkable channels. LCA2B is a true TUBE VCA compressor, using a tube as the VCA
This kind of compressor is also known as a Vari Mu compressor. TUBE-TECH LCA 2B is one of the most powerful and versatile VCA compressors in the market. LCA 2B is extremely versatile, and it works equally well on vocals, instruments and as a bus compressor. Due to its very fast and smooth attack, it is also perfect for drums and percussion.
There's literally nothing the LCA 2B can't handle very well: Powerful bus compression (it's a dream used for bus compression both inserted and in parallel.) and fine single instrument and voice compression. The action of the LCA2B is always easy to hear, so finding the right setting on this compressor is a not complicated.
LCA2B is designed to be the TUBE-TECH equivalent of the Fairchild 670, but only in terms of action, not the actual electronics. It is designed with the Fairchild in mind, delivering similar action but retaining its transparency or high frequencies, even when pushed to the limit). 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 that has found good use in many top live engineers' touring racks.
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 as well as manual control. The limiter att/rel is fixed. The LED display is fed from the con-trol 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.
Tube VCA compressor/limiterAll-tube based push-pull amplifierFrequency response @ -3 dB: 5 Hz to 50 kHzLow noise: < -85 dBU @ 10 dB gainCMRR: > 60 dB @ 10 kHzSeparate compressor and limiterOutput Gain: -6 dB to +10 dBInterconnection of several compressors via two bussesClickless In/Out relayConductive plastic potentiometersGold plated switchesInputs and outputs are transformer balanced and fully floatingLinkable for stereo applications
Variable ratio (1.6:1 to 20:1)Variable threshold (Off to -20 dBU)Continuously variable attack and release timesChoice between 6 presets (Fairchild) and manual attack/release controlLED Gain reduction display
Variable threshold (Off to 0 dBU)Attack: 0.8 ms - release: 0.5 secSeparate Limiter On/Off switchLED indication of limiter action
May 25, 2015
Nice and Rich
I've recently tried out and purchased the Tube-tech LCA 2B and very happy with the purchase. I mostly use it on my drum buss and also tried it on a Master fader. Beautiful, rich and wide on the drums. Makes everything breathe nice and easy. Exactly what Read more
I was hoping!! I would definitely recommend it to everyone!! A must try.
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