Tube-Tech LCA-2B Dual Channel Tube VCA Compressor The 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.( Voltage controlled amplifier.) This kind of compressor is also known as a Vari Mu compressor. TUBE-TECH LCA 2B is one of the [...]