Technics SL DL1 (1981)
A direct-drive, fully automatic turntable with linear tracking arm, released in March 1981
Overview
The Technics SL-DL1 is a linear tracking full auto player made by Technics, released in March 1981. It uses a dynamic balance type linear tracking tone arm that moves straight across the record surface, minimizing tracking error to within ±0.1°. The turntable automatically detects record size—setting 33 1/3 rpm for LPs and 45 rpm for singles—via microcomputer control, and allows manual selection between speeds. It features a plug-in MM stereo cartridge and is built around a direct-drive system with a brushless DC motor integrated into the platter.
Specifications
| Drive system | Direct drive |
| Drive motor | Brushless DC motor |
| Control system | B. F. G. Servo |
| Turntable/Platter | 300 mm aluminum die-cast |
| Number of revolutions | 33 1/3, 45 rpm, Auto Select (Manual Allowed) |
| Fine adjustment of rotational speed | 10% |
| Wow flutter | 0.025%W.R.M.S(JIS C5521) 0.012% W. R. M. S (Rotating Part Only) |
| Signal-to-noise ratio | 78dB(IEC98A weighted) |
| Tone Arm Format | Dynamic balance type linear tracking arm |
| Tone Arm Gimbal | Gimbal suspension bearing structure |
| Effective arm length | 105mm |
| Tracking error angle | Within ± 0.1 ° |
| Arm effective mass | 9g (including cartridge) |
| Arm resonance frequency | 12Hz |
| Arm drive motor | DC Motor |
| Cartridge Type | Plug-in connector, MM stereo cartridge |
| Cartridge Dead weight | 6.0g |
| Applicable cartridge weight | 3.5 ~ 8.5 g |
| Stylus pressure adjustment range | 0 ~ 3 g |
| Exchange needle options | EPS-24CS(¥2,800) EPS-23CS(¥3,500) EPS-23ES(¥6,500) EPS-22ES(¥7,500) EPS-202ED(¥10,000) |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 18W |
| External dimensions | Width 430x Height 88x Depth 350 mm |
| Weight | 7.1kg |
Design
The SL-DL1 uses a dynamic balance linear tracking arm supported by a 4-point gimbal suspension bearing structure, with a slide bearing low-friction path for smooth travel. Arm movement is driven by a DC motor and guided by an optical sensor near the stylus tip that detects deflection, keeping internal force near zero. The turntable employs a direct-drive motor (D.D. motor) that integrates the rotor and platter, and the cabinet uses TNRC material for vibration isolation. The cartridge connects via a proprietary plug-in system, and the entire operation is microcomputer-controlled for full auto playback, including 2-speed search for cueing.
Market
Originally priced at ¥59,800 in Japan at launch, the SL-DL1 was listed for $280 USD in 1983. Used units have appeared on the market, such as one listed at £179.00, and replacement parts like belts and styli are available from specialty vendors. Known issues include tone arm tracking failure, speed instability, and hum in both channels during playback.
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