Sony EM-3

The Sony EM-3 Tapecorder is a portable monophonic reel-to-reel tape recorder designed for professional reporters and field use, featuring a metal case for durability.​ It represents a significant step forward from the EM-1 and EM-2 by adopting a three-head system, a major feature for professional use.

Key Specifications

• Dimensions: 320 x 240 x 120 mm (12.6 x 9.4 x 4.7 inches)​

• Weight: 3.6 kg (7.93 lb) without batteries​

• Tape details: ¼-inch wide tape on up to 5-inch diameter reels; speed of 9.53 cm/s (3¾ ips)​

• Heads: 3 heads (full track erase, record, playback)​

• Power: 8 x 1.5V D-cell batteries or external 12V DC jack​

• Inputs/Outputs: XLR microphone input; 3.5 mm mono headphone jack (with monitor for tape/source and VU meter from -10 dB to +3 dB, plus battery check)​

This model improved on predecessors like the EM-2 by consolidating to 8 batteries total (versus separate sets for motor and amps) and adding a DC jack, emphasizing portability and self-contained operation for audio amplification without wave bands.