Sony DTC-77ES Digital Audio Tape Deck DAT 90s - Excellent

The Sony DTC-77ES is a premium, high-end Digital Audio Tape (DAT) recorder introduced by Sony in 1991as part of its prestigious "Elevated Standard" (ES) series. It is widely celebrated by audiophiles for its tank-like build quality, weighing an impressive 11 kg, and featuring a heavily shielded copper-plated chassis. In the United States, this exact model was marketed under the name DTC-87ES. 

Key Performance SpecificationsThe deck provides near-perfect reproduction of digital audio, characterised by the following technical limits:

• Frequency Response: 2Hz to 22kHz (±0.5dB)
• Signal-to-Noise Ratio: Greater than 93 dB
• Dynamic Range: Greater than 93 dB
• Total Harmonic Distortion (THD): Less than 0.0045% at 1kHz
• Wow and Flutter: Below measurable limits (±0.001% W.Peak) 

Standout Technical Features [ 4 Direct-Drive Motors ] (Dedicated to Drum, Capstan, & Twin Reels) │ ▼ [ 4-Head Drum Assembly ] (Enables Simultaneous Off-Tape Monitoring) │ ▼ [ 1-Bit A/D ] ───► [ SCMS Circuit ] ───► [ 1-Bit D/A ]

• 4-Head System: Unlike entry-level 2-head DAT machines, the DTC-77ES houses a 4-head configuration. This allows for true off-tape monitoring (RAW - Read-After-Write), meaning you can listen to the exact recorded signal from the tape in real-time while recording is in progress. 
• 4 Direct-Drive (4D.D.) Mechanism: The transport uses four separate, dedicated motors to control the head drum, capstan, supply reel, and take-up reel independently. This eliminate rubber drive belts in the critical transport path, dramatically reducing tape wear and physical mechanical jitter.
• Advanced Conversion: It utilizes a 1-bit High-Density Linear Converter (HDLC) A/D system paired with a 1-bit Pulse D/A converter to provide seamless, jitter-resistant audio filtering.
• Flexible Sampling Rates: It natively records and plays back via analog or digital inputs at 48 kHz (16-bit linear), 44.1 kHz (16-bit linear, restricted to digital inputs on this generation), and a 32 kHz Long Play mode that squeezes up to 4 hours of continuous audio out of a standard DT-120 tape.