Great combination of the already legendary D-150 hybrid power amp with the SA-31 hybrid pre-amp. Both units are technically in very good condition and can play for many more years, tubes were tested and do not need to be replaced anytime soon. Optically there are some user traces here and there but certainly nothing shocking, see pics for details Power amp D-150: The ultimate hybrid stereo final stage that offers the best of both worlds for good sound; the input has 2x 6Dj8 and 2x6N6 lamps, enormous power with two toroidal transformers and 12 Toshiba transistors (2x 170 W at 8 ohms, 2 x 340 W 4 and 600 W at 2 ohms), it works very stable even with very difficult speakers, bi-wiring speaker dock, weighs 20 kg. Pre-amp SA-31: Frequency response: 20Hz to 50kHz Total harmonic distortion: 0.1% Input sensitivity: 150mV (line) Signal to noise ratio: 90dB (line) Valve complement: 2 x 6N16 Dimensions: 430 x 80 x 300mm Weight: 4.5kg Finish: black, silver Can be packed in 1 package