The LA-610 packs tremendous sonic versatility and is an ideal front-end for tracking with modern DAW's and the serious project studio looking to get the UA sonic experience : real quality and character at an accessible price. In collaboration with Dennis Fink, one of the original UREI analog design engineers, the LA-610 was carefully designed to deliver the essence of the "LA" sound but without the costs of being an exact LA-2A component clone.The LA-610 uses three 12AX7A's, a single 6072A and a single 6AQ5 tube for amplifier warmth and overall tonal balance. After the preamp section, the LA-610 offers a new T4 optical compressor. The electro-optical detector or "T4 cell", is the very heart and soul of the Teletronix LA-2A. The unique combination of electroluminescent panel and photo-resistors inside the T4 cell are the crucial circuit components that give these compressors their signature sound.