It is in near perfect condition. No scratches and very clean. I listened to this SV-237 (not to he MK II) and the sound reproduction is well defined and powerful. I compared it with the SV-236 model and the quality was almost identical. The tubes all check good.
The tubes are also removable. The main difference between the SV-237 and the MKII is that the Bluetooth is built into the MKII. Included in this SV/237 is a separate B-1 BT Adapter/DAC that compliments the amplifier quality with all of the conveniences of Bluetooth.