Technics SL-B21 (1983)
A semi-automatic belt-drive turntable from Technics, produced in 1983, featuring a DC servo motor and plug-in cartridge system.
Overview
The Technics SL-B21 is a semi-automatic turntable made by Technics in 1983. It uses a belt-drive system with a DC servo motor to maintain consistent platter speed. The turntable features a statically balanced straight tonearm and a 304mm die-cast aluminum platter for stable rotation. It comes equipped with a T4P-type plug-in cartridge, allowing for straightforward replacement or upgrade, with user reports indicating compatibility suggestions for Ortofon models. Despite limited documentation, the SL-B21 has appeared in multiple online sources, including owner testimonials and parts listings, and is noted for remaining in reliable working condition decades after production.
Specifications
| Product type | Semi-Automatic Belt-Drive Turntable |
| Drive type | belt driven |
| Tonearm | statically balanced, straight tonearm |
| Cartridge type | T4P type plug in cartridge |
| Platter | 304mm aluminium die-cast |
| Wow and flutter | 0.045% WRMS |
| Rumble | -70dB |
| Dimensions | 430W x 106H x 375D mm |
| Weight | 4.2kg |
Design
The SL-B21 uses a DC servo motor to drive the belt-connected platter, contributing to its low wow and flutter rating. The tonearm is a straight, statically balanced design, and the cartridge connects via a T4P plug-in system, simplifying maintenance and upgrades.
Market
Replacement parts such as drive belts and stylus/cartridge assemblies are commonly available through online retailers and specialty audio sites. Original and reprinted owner's manuals can be found for download or purchase, supporting ongoing maintenance. The model has been described by users as a "Bargain Of The Day," suggesting it holds value as an affordable vintage turntable option.
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