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"The Alieno's first gain stage uses a symmetrical stage using ECC82 tubes, followed by the output stage, which uses a 300B tube per channel, in a single-ended Class A cathode output configuration . The KT150 only works as a linear current generator to power the 300B.
The 'trick' lies in connecting the power stage to valves to the load (columns) by means of a low value resistor, whose voltage variation modulates the current supplied by the solid state power supply, simultaneously connected to the load in parallel with the 300B, whose 'signature' (transfer curves) is thus 'emulated' by the PSU.
In the absence of output transformers, the floating ground prevents the speakers from being affected, in case of oscillation or amplifier malfunction.
This innovative technology, called LTD, Loudspeaker Tubes Direct , was created by Fulvio Chiappetta, designer at SI Audio, Italy."