JVC 20X
Little is documented about the JVC 20X. No specifications, marketing material, or standalone reviews survive under that exact model name. The one "20X" JVC product in the period record is the 4MD-20X, a CD-4 phono pickup that got extra lab data in High Fidelity (December 1974, p.58). Whether this page's "20X" means that cartridge or a separate product can't be confirmed from surviving sources.
If the 4MD-20X is the intended subject, the record shows a CD-4 phono cartridge that measured strongly through the audible band. Channel separation was generally excellent at about 25 dB, though JVC rated the cartridge for 30 dB. Both linearity and separation suffered at the resonance peak. In the CD-4 carrier region, response measured +1¼/−1¼ dB from 20 Hz to 18.5 kHz on the left channel and +1¼/−2 dB from 20 Hz to 17 kHz on the right. Channel separation stayed above 19½ dB in the 22-42 kHz range. At a 1.5-gram tracking force, maximum tracking levels reached +12 dB at both 300 Hz and 1 kHz (re RIAA 0 VU).
Beyond that single report, nothing else is documented: no service manual, no other reviews, no production timeline.
Data from the High Fidelity report on the JVC 4MD-20X:
- Audible-band separation: ~25 dB measured; 30 dB specified by JVC
- CD-4 carrier response: left +1¼/−1¼ dB, 20 Hz–18.5 kHz; right +1¼/−2 dB, 20 Hz–17 kHz
- Carrier-region separation: >19½ dB, 22–42 kHz
- Max tracking level at 1.5 g VTF: +12 dB at 300 Hz and 1 kHz
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