Cyber-20 is the first high-end vacuum tube headphone amplifier produced by Opera Audio.
Xindak H1 headphone amplifier solid state with two jack sockets 6.35 mm headset jack, a pair of RCA inputs, one pair of RCA outputs, and a USB port to connect a PC.
Tube amplifier for headphones and a Digital / Analog Converter DAC USB 24/96. Inputs and outputs RCA line. The USB input is asynchronous. Valve double triode Electro Harmonix 6922.
Tube amplifier for Headphone and Digital Analog Converter DAC USB 24/192 with DSD format reading. Texas 1793 DSD + XMOS USB DAC Converter. RCA line inputs and outputs. Asynchronous USB input. Electro Harmonix 6922 double triode Russian tube.
Xindak MT-2 tube Amplifier headphone with valves 6P1 military NOS in the preamp and driver 6J1. RCA inputs, and USB. Output to the speakers.