Denon DP-21F
A full-auto direct-drive turntable with electronically controlled tonearm and quartz-locked speed stability
Overview
The Denon DP-21F is a fully automatic turntable with a bidirectional servo direct-drive system and an electronically controlled tonearm. It uses a 30 cm die-cast aluminum platter driven by a linear drive motor. Speed is held by Denon's magnetic recording detection method and a quartz-based bidirectional servo system. It runs at 33⅓ and 45 RPM, selected with soft-touch push buttons that are self-illuminated with LEDs.
The tonearm is a dynamic balanced, straight, semi-integrated design. During automatic functions it works without physical contact, thanks to a contactless electronic anti-skating mechanism. That keeps the movement smooth and low-interference, with good tracking sensitivity. Effective length is 220 mm, overhang is 16 mm, and tracking error is 3 degrees or less. Needle pressure is continuously adjustable from 0 to 3 grams with a dedicated control. The system applies the correct pressure automatically using torque from a vertical drive motor, so it can adjust in real time even during playback.
The DP-21F comes with a factory-mounted DL-60 MM cartridge. It has a diamond elliptical stylus, 2.5 mV output, and a dynamic compliance of 10 × 10⁻⁶ cm/dyne. It tracks at 1.8 ± 0.3g and gives 25 dB channel separation at 1 kHz. Frequency range is 20 Hz to 30 kHz, and the exchangeable stylus is the DSN-60. The cabinet is rigid resin, integral-molded, and measures 434 × 105 × 360 mm with the dust cover closed. It weighs approximately 5 kg. Power is 100 VAC at 50/60 Hz, and it draws just 6 watts.
Design
Automation is the point of the DP-21F. A newly developed microprocessor controls the tonearm's horizontal and lifter motions with two dedicated motors, which gives fully automatic start, stop, and return. The electronic servo lifter keeps the lift speed consistent regardless of needle pressure or temperature, so record and stylus shock are minimal. Conventional mechanical auto-return systems add mechanical constraints. This contactless control structure avoids them and preserves arm sensitivity. A quick-repeat function resumes playback from the beginning of the record without returning the arm to the rest. All operational buttons are self-illuminated, and the arm can be moved by hand even during playback, which is uncommon in full-auto decks.
Market
The Denon DP-21F had an original price of ¥42,800 around 1982. Current market values and common failure modes are not documented in available sources.
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Related Models
- Denon DP-100M (1978)
- Denon DP-47F (1979)
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- Garrard SP (1975)
- Luxman PD-310 (1981)
- Luxman PD-555 (1983)
- Thorens TD-124 (1957–1967)
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