EAT Jo No8 Cartridge Lab Report
While the alloy frame, yoke, magnets and mounting plate of the No8 all resemble those of the No5 [HFN Dec '18] the revisions to the cantilever, diamond, copper windings, chestnut body material and – importantly – the polymer suspension have all made their mark. Output is a dB or so lower than the No5 at 385µV (re. 1kHz/5cm/sec) while channel balance is tighter at 0.26dB and separation wider at 35dB through the midrange. The No8 is also a slightly higher compliance design than the No5 (15cu vs. 12cu) and some 2.5g lighter in weight, so therefore better suited to lower mass tonearms. Moreover it's a better tracker, even at the lower recommended 2.3g downforce. In practice the No8 offers some 10µm 'headroom' over the No5, achieving >80µm/75µm via the left/right channels, respectively, and keeping hold of the maximum +18dB groove modulation (re. 315Hz/5cm/sec) at 1% THD where the No5 had skipped off into the lead-out groove at its rated 2.4g downforce.
The 'nude Shibata' diamond is better cut and aligned too, so the No8's VTA is far more accurate at 22° than the No5's 28°. However, the No8's body is very tall, so most tonearms will need to be raised at the rear to optimise VTA and frequency response. The latter mirrors that of the No5 with a 'mild' mid/presence and slightly 'brighter' aspect to central images [black trace, Graph 1] than those at the periphery of the soundstage [red trace]. Generator symmetry is improved, however, and this is not only reflected in the reduced vertical distortion of <2% vs. <3% (No8 vs No5, from 20Hz-3kHz at –8dB re. 5cm/sec) [red trace, Graph 2] but also in the matching trend of THD vs. frequency between lateral and vertical cuts [black vs. red traces, Graph 2]. PM
Generator type/weight | Moving-coil / 12.5g |
Recommended tracking force | 2.2-2.5mN (2.3mN) |
Sensitivity/balance (re. 5cm/sec) | 385µV / 0.26dB |
Compliance (vertical/lateral) | 15cu / 14cu |
Vertical tracking angle | 22 degrees |
L/R Tracking ability | >80μm / 75μm |
L/R Distortion (–8dB, 20Hz-20kHz) | 0.7–24% / 0.5–24% |
L/R Frequency resp. (20Hz-20kHz) | +0.3 to –5.5dB / +0.3 to –3.6dB |
Stereo separation (1kHz / 20kHz) | 35dB / 23dB |
Price | £2290 |