This deck has amazing specs and includes a fine bias control.

The buttons are logic controls. Super responsive and fast.
Records with brilliant clarity, making Chrome/Metal tapes almost unnecessary. I have been using TDK-D Type I tapes for my Sony Walkman and the warmth, detail and sound reproduction are unbelievable. 

My 2 cents on 2-Head vs 3-Head
I have had 2-Head and 3-Head decks over the years. 3-Head decks are nice when you want to monitor the recording levels of the tape during the recording process. This is not a mandatory feature. The DR-3 has a 20-20,000Hz frequency response with 2 heads. It will record and play back cassettes with quality that rivals any cassette deck. 

Summary
The DR-3 is a 2-Head, 3 motor cassette deck with a 20-20,000Hz frequency response and less than 0.06% WTD RMS wow and flutter. The deck is not loaded with unnecessary bells and whistles. The playback and recording capability rivals most high-end cassette decks.

Specifications

Type: 2-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.8 cm/s

Heads: 1 x record/playback, 1 x erase

Motor: 1 x reel, 1 x capstan, 1 x mechanism

Tape Type: type I, CrO2, Metal

Noise Reduction: B, C

Frequency Response: 20Hz to 20kHz  (Metal tape)

Signal to Noise Ratio: 70dB  (dolby C)

Wow and Flutter: 0.06%

Total Harmonic Distortion: 1.0%

Input: 50mV (line)

Output: 0.5V (line)

Dimensions: 430 x 100 x 320mm

Weight: 5.4kg

Year: 1992

Price: GBP £350 (1992)