Consonance Cyber 20 tube Amp for headphones with valves EL84 and external power supply with toroidal transformer.
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 headphones and a Digital / Analog Converter USB DAC 24/192 with reading DSD format. DAC Texas 1793 DSD + XMOS USB. Inputs and outputs RCA line. The USB input is asynchronous. Valve Russian double triode Electro Harmonix 6922.
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.