ADC QLM33 MkIII (Years Unknown)
Surviving information on the ADC QLM33 MkIII is thin. What it is: an induced-magnet phono cartridge from ADC's QLM line. The QLM series was ADC's induced-magnet family, and the "Mk III" suffix marks this as a later revision of the QLM33. Beyond that, the record is mostly a price tag and a stylus description.
The clearest period source is a dealer listing in HiFI-Stereo (1982, p.95), which priced the QLM 33 Mk III phono cartridge at $70. A year later, HiFI-Stereo (1983, p.69) ran a listing for a sibling model, the QLM 32 Mk III. It describes an induced-magnet phono cartridge with 1.5 mV output, 24 dB channel separation at 1 kHz, and a 1.25 g tracking force. Those figures belong to the QLM 32 Mk III, not the QLM33 MkIII, and shouldn't be applied here. They do show roughly what class of cartridge this was and how ADC's QLM Mk III revisions were being pitched at the time.
What's actually documented about the QLM33 MkIII itself comes down to a short list:
- Product type: induced-magnet phono cartridge (ADC QLM series)
- Period price: $70, per HiFI-Stereo (1982, p.95)
That's all of it. No production years, no output voltage, no tracking force, no channel separation, no compliance figures, and no manufacturer documentation specific to this model have surfaced. The QLM33 MkIII sits alongside related ADC models like the QLM30 Mk III, QLM32 Mk III, and QLM34 Mk III, but each of those is a distinct cartridge and their specs don't transfer. Anyone needing exact setup figures for a QLM33 MkIII will have to measure the unit in hand.
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