Source: Press Release, Last Accessed: 2016/09/16

The L2.1 Reference employs a pure class A operation from input to output, with no overall feedback at any stage; all stages, including high current output buffers, are single-ended. Also featured are specially selected high voltage super linear MOS-FETs in the signal path and TKD stepped potentiometers for volume control, the best available on today’s market, Lamm says.
The preamplifier’s audibly neutral power supply features a choke contained filter, a full-wave vacuum tube rectifier and vacuum tube voltage regulator which allow to virtually eliminate the hum and buzz and, ultimately, to ensure the authenticity of the essence of sound throughout the entire dynamic range without any coloration. Other features include 3 inputs; one tape/home theater processor loop; output signal phase switch; balanced and single-ended outputs; protection circuitry designed to enable manual muting of the output signal; and built-in remote on/off for Lamm power amplifiers.
In a nutshell, the L2.1 Reference features some serious upgrades and modifications as compared to the L2 Reference, including an increased immunity to unwanted radio frequency interference, modifications in protection and time delay circuits, an improved signal-to-noise ratio and the replacement of some critical components with newly available types of better quality, in particular, replacement of electrolytic capacitors in the tube voltage regulation section with newly developed high density polypropylene capacitors of comparable size and value, and the use of a new type of pc-boards of superior quality, with gold-plated traces and thru-holes.
Each preamplifier is carefully crafted with the finest materials and top quality parts like military-grade Dale/Vishay metal-film resistors, RCD wire-wound resistors, TKD 41-step volume control potentiometers, Bourns multi turn potentiometers, Vishay electrolytic capacitors, Electrocube, Epcos and Rifa/Kemet film capacitors; Hammond chokes, god-plated Neutrik connectors, and military-grade low-noise long-life vacuum tubes. The L2.1 Reference, also, features a custom-designed super-low noise power transformer.
Mind that, at the time of writing this, no photo of the new product was officially published, therefore the picture above is the original L2 Reference preamplifier.

For more information: http://www.lammindustries.com/

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