The absolute speed accuracy of the Yamaha GT5000 will be down to how accurately the user can set the speed using the strobe light and disc, because there is no ‘default’ or ‘0’ setting on the pitch control knob, so Newport Test Labs instead used a test record with a 3kHz test tone and set the speed using a frequency counter to ensure the most accurate measurements.
Once the GT-5000’s speed was set to exactly 33.33 rpm, the lab switched the platter speed to 45 rpm and played a 3kHz test tone that had been recorded at 45 rpm. The frequency counter reported the frequency as 2990Hz, 10Hz lower than it should have been. This is only 0.3% low, and not much in terms of absolute pitch so you may not want to bother about adjusting it, but of course it’s easy enough to do if you do care.
Long-term speed variations were vanishingly small, as you can see from the histogram accompanying this review. (Graph 1.)
Rotational stability, as measured by Newport Test Labs, and as graphed in Graph 2, was also excellent. This test measures the speed for a full 30 seconds. The raw variations are shown by the khaki coloured trace. The mean speed over the period is indicated by the dashed blue line. The overall wow and flutter, measured according to the IEC 386 standard is shown for a dynamic measurement (purple trace) and for a 2-Sigma analysis (red trace).
Newport Test Labs used separate Meguro and MTE instrumentation to measure long-term (20-minute) speed variations and reported wow and flutter as being 0.06% RMS unweighted and 0.08% CCIR weighted. The wow and flutter the laboratory measured was identical for both 33.33rpm and 45rpm speeds, for both the RMS and CCIR standards.
Graph 3 shows the noise (rumble) of the Yamaha GT-5000, referenced to a 315Hz test signal recorded at a velocity of 3.52cm/sec. You can see that it’s mostly more than 90dB down, which is an outstandingly good result: the best I have ever seen, in fact.
The Yamaha GT-5000’s power consumption is negligible, with the turntable drawing only 0.41 watts (+0.845 PF) in standby, and only 10.67-watts (+0.755PF) at 33.33rpm.
On the basis of these outstandingly good test results I can confidently state that the Yamaha GT-5000 sets a new standard in turntable performance. Steve Holding