The FX--Audio Tube-03 MKII is an update of the Tube-03E. It is an affordable two-tube 6K4 preamplifier. Complete and powerful, with its own volume control and adjustments for bass and treble levels. These tubes are associated with AOP NE5532 and JRC4556 for tone control and participate in a rich and musical sound reproduction.

In terms of connectivity and connectivity, the preamplifier offers stereo RCA as well as Bluetooth 5.0 aptX as input, thanks to the use of a QCC3008 chip for reception and an ES9023 converter for decoding. It is thus possible to broadcast your music remotely, directly from your smartphone. For its outputs, the Tube-03 MKII has a stereo RCA as well as a headphone output amplified on 3.5mm jack. All the connectors are gold-plated, in order to facilitate a quality signal transmission.