Technics SL-B21 (1983)

A semi-automatic belt-drive turntable from Technics, produced in 1983, with a DC servo motor and a plug-in cartridge system.

Overview

The Technics SL-B21 is a semi-automatic turntable made by Technics in 1983. It is belt drive, with a DC servo motor holding the platter speed steady. The tonearm is a statically balanced straight design, and the platter is a 304mm die-cast aluminum one. The cartridge is a T4P-type plug-in, so swapping or upgrading it is easy. User reports suggest Ortofon models fit. Documentation is thin, but the SL-B21 shows up in several online sources, including owner testimonials and parts listings, and it is noted for still working reliably 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 DC servo motor drives the belt-connected platter, which gives the SL-B21 its low wow and flutter rating. The tonearm is straight and statically balanced. The cartridge connects through the T4P plug-in system, which keeps maintenance and upgrades simple.

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. Users have described the model as a "Bargain Of The Day," which suggests it holds value as an affordable vintage turntable.

eBay Listings

Technics SL B21 vintage audio equipment - eBay listing photo 1

2x TECHNICS SL-B21 SLB21 SL B21 HOOD COVER HINGES - 3D STAMP

$33.42

See all Technics SL B21 on eBay

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