WM-DD3DDIII

WML ID #109

Manufacturer Sony

Model WM-DD3

Nick DDIII

Series DD

Year 1989

Made in Japan

Initial price 270 DM

Technical details, specifications

Battery 2AA

Battery life 9 h

Available colors black gray red

Dimensions 79.7*110*32.8 mm (288 cm³) 3D size

Weight 290 gr

Window yes

Frame

plastic

Case

metal

Carry Pouch

Expandable no

External compartment no

Drive DirectDrive, Quarz capstan servo

Tape selector Manual switch

Waterproof no

Speaker no

Frequency range 40-15000 Hz

FMax output 2x20 mW

Functions

DC in yes

Record by input no

Record by int mic no

Hotline mode yes

Cue no

Balance (L/R) no

Phone type 3

Equalizer no

Auto volume no

Auto reverse no

Anti rolling yes

AMS no

Blank skip no

Logic control no

Hold lock no

Bass no

Noise reduction Dolby B NR

Radio no

Radio tuner none

Radio bands 0

Remote control no

Wireless headphone no

Indicator led

Description

Added a quartz-locked action to the DD motor, giving absolute speed stability.

The WM-DD3 was in simple terms a development of the DD-100 according to the service manual. The DD-100 uses the WM-DD2 main PCB and an additional daughterboard for DOL bass expansion, which is conspicuously missing from the DD3. It would skip one generation and appear in the successor, the WM-DD30.

Building on the strengths of the previous model it added a quartz-locked action to the DD motor (from WM-DC2), giving absolute speed stability under all operating conditions. A similar system had been used in the WM-D6 but the WM-DD3 was the first playback-only model to use it.

Unlike the WM-D6 the WM-DD3 did not offer the facility to defeat the quartz lock and trim the playback speed manually, instead the circuit was permanently active and fully automatic in action.

Quartz lock aside the WM-DD3 was nearly identical to the DD-100 / WM-DD2, including the provision of Dolby B NR and compatibility for all tape types. As mentioned above, the next model in the development of the series was the WM-DD30.
Via walkmancentral (edited)