Sansui SR 505
A belt-driven turntable from Sansui with a precision static balance tonearm and auto-up/auto-stop.
Overview
The Sansui SR 505 is a turntable made by Sansui Electric Co., Ltd. It belongs to Sansui's SR-series and stands out for its tonearm and its automated operation. Specific production years are not documented, but the engineering fits early 1970s Japanese audio equipment.
Specifications
| Drive system | Belt drive |
| Auto mechanism | Auto-up / auto-stop |
| Motor | 4-pole synchronous type |
| Rated speed | 33 1/3, 45 rpm |
| Signal-to-noise ratio | 45 dB or more |
| Wow and flutter | Not more than 0.06% |
| Arm type | Static Balanced Single Support Pipe Arm |
| Arm effective length | 230mm |
| Overhang | 15mm |
| Tracking error | ± 1.5 ° |
| Needle pressure variable range | 0 ~ 5g (Direct Reading) |
| Cartridge type | MM Type |
| Cartridge frequency characteristic | 20 Hz to 20 kHz |
| Cartridge output voltage | 5mV |
| Cartridge crosstalk | 25 dB or more |
| Cartridge proper needle pressure | 2.0g |
| Cartridge needle tip | 0.5 mil diamond needle |
| Cartridge compliance | 7x10 -6 cm/dyne |
| Cartridge standard load resistance | 50k Ω |
| Turntable | 300 mm φ Aluminum Alloy Die-cast, 1.6 kg |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 20W |
| External dimensions | Width 505x Height 198x Depth 370 mm |
| Weight | 11.5kg |
Design
The SR 505 uses a precision-finished static balance type gimbal support pipe arm with a lateral balancer and continuously variable internal anti-skate adjustment. It features a direct-reading needle pressure mechanism in 0.5g steps, a slow-acting oil-damped lift mechanism resistant to temperature changes, and a belt protection system. The auto-up mechanism employs a magnet reed switch and plunger with zero side pressure during operation. The turntable includes a gold-plated connection terminal, alumina scratch board, zinc die-cast accessory base, universal light shell, howling prevention insulator, feather-touch start lever, push-button speed switching with indicator, and a removable smoked acrylic dust cover. The cabinet is finished in walnut open-pore wood.
Context
Sansui Electric Co., Ltd. was founded in Tokyo, Japan in 1947 by Kosaku Kikuchi. The name "Sansui" (山水) means "mountain and water." Sansui made notable contributions to turntable design, and models such as the SR-929 and SR-838 competed with high-end offerings from Thorens and Technics.
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