Douk Audio U3 Mini Class A Headphone Amplifier HiFi Desktop Home Stereo Amp DC5V : Amazon.ca: Electronics
Archimago's Musings: MEASUREMENTS: Yeeco TI TPA3116 Class D Amplifier (aka Nobsound NS-01G, Douk Audio F900S, Mogu F900S)
Douk Audio T4 Plus Vacuum Tube Phono Preamplifier, MM/MC Turntable Audio Preamp, GE5654 Headphone Amp with VU Meter for Record Player Home Stereo : Amazon.ca: Electronics