Australian HIFI - - ON TEST -

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

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