MEASUREMENTS

I started testing the sample of the Technics SU-R1000 that KM had auditioned, serial number GJ1001007, with my Audio Precision SYS2722 system (see the January 2008 As We See It¹). However, while I was performing the small-signal tests, the amplifier turned itself off. The temperature of the black grilles on the amplifier’s top panel, which cover the internal heatsinks, was 127.9°F/52.9°C. I wondered if the amplifier had over-heated. According to the manual, “one of the unit’s safety devices may have been activated. Press the unit on/off button to the Off position. If the unit does not switch to standby, disconnect the AC power supply cord, wait for at least 3 minutes, then reconnect it.”

I followed these instructions, waiting 20 minutes instead of 3 minutes to allow the amplifier to cool down. However, when I turned the amplifier on, it