Beyerdynamic A20 Headphone Amplifier For Sale

Here is a beyerdynamic A20 headphone amplifier. Really beautiful condition, good-sounding, very gently used. Powerful enough to drive pretty much any headphone you might have. The circuit is frequently imitated, but this is the genuine article, implemented in surface-mount discrete components, very well-made. The only reason I am selling it is that I upgraded to a model A2 at one point, but this one really sounds just about as good as its significantly more-expensive big brother.
In back are a single RCA left/right line level input and a single RCA left/right output (hard-wired to the input, passes line-level input whether the unit is powered on or not). In front are the two headphone jacks.
Also worth mentioning is the integrated international power supply. Comes with US and European power cables, as shown in the pictures(1 x type E+F (CEE 7/7) and 1 x type B (i.e. US)).
As you can see, comes with all the original packaging, and I will double-box to make sure it gets to you in the same excellent condition you see in the photos.
Specifications:Input impedance . . . . . . . . . . . . . . . . . . . . . 25 kΩMaximum amplification . . . . . . . . . . . . . . . . 18 dBT.H.D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01% at 170 mW / 250 ΩAmbient temperature. . . . . . . . . . . . . . . . . . +10 °C to +40 °CAudio connections. . . . . . . . . . . . . . . . . . . . 2 headphone sockets, 1/4\" stereo jack (6.35 mm)Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1640 gFrequency response. . . . . . . . . . . . . . . . . . 10 Hz - 100 kHz (-1 dB)Channel separation . . . . . . . . . . . . . . . . . . > 80 dB at 1 kHz / 250 ΩOutput power . . . . . . . . . . . . . . . . . . . . . . . 100 mW / 600 Ω170 mW / 250 Ω150 mW / 30 ΩSignal-to-noise ratio . . . . . . . . . . . . . . . . . . > 100 dB (unweighted)Output impedance . . . . . . . . . . . . . . . . . . . Headphone output 100 ΩInput voltage . . . . . . . . . . . . . . . . . . . . . . . 100 - 240 V AC / 50/60 HzPower consumption. . . . . . . . . . . . . . . . . . < 10 W via integrated switching power supplyHumidity . . . . . . . . . . . . . . . . . . . . . . . . . . . < 90%Height above sea level. . . . . . . . . . . . . . . . < 2000 m1 line output1 audio input via RCA phono socketsDimensionsHousing only . . . . . . . . . . . . . . . . . . . . . . . . 164 x 194 x 48 mmHousing incl. button, rubber feet, RCAphono sockets . . . . . . . . . . . . . . . . . . . . . . . 164 x 212 x 55 mm