Quad ESL-63 Delay Line PCB Assembly Electrostatic Speaker Spares Repairs

Quad ESL-63 delay line subassembly, removed from parent speaker. Sold as spares/repairs.

Specifications

• Audio Inputs: 2
• Connectivity: 2
• Compatible Brand: Quad
• Year Manufactured: 1980s
• Delay-Line Architecture: uentially via analogue LC delay lines; ~24 µs delay per s
• Nominal Impedance: 8 ohms (6.2 ohms minimum)
• Sensitivity: 86 dB SPL for 2.83 V rms at 1 metre
• Power Handling: 100 W / 10 V rms / 40 V peak maximum signal input
• Transducer Type: Full-range electrostatic (dipole)
• Nominal Impedance: 8 ohms (6.2 ohms minimum)
• Sensitivity: 86 dB SPL for 2.83 V rms at 1 metre
• Power Handling: 100 W / 10 V rms / 40 V peak maximum signal input
• Delay-Line Architecture: 8 concentric annular stator rings fed sequentially via analogue LC delay lines; ~24 µs delay per stage, ~168 µs total — simulates a point source ~30 cm behind the panel
• Per-Stage / Total Delay: ~24 µs per stage; ~168 µs total across 7 stages
• Diaphragm Material: Melinex (biaxially-oriented polyethylene terephthalate / Mylar-type) ultra-thin film
• Radiation Pattern: Dipole (full-range, open-backed panel)
• Dimensions (H × W × D): 36" H × 26" W × 6" D (base depth 10")