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

Quad ESL-63 delay line PCB assembly, sold as spares or repairs — removed from the speaker chassis and not in a serviceable installed state.

The Quad ESL-63 is a full-range electrostatic loudspeaker, and its delay line uses concentric annular stator rings fed through analogue LC delay stages to simulate a point source behind the panel. This listing is for the delay line PCB assembly on its own, removed from the speaker.

Key specifications

• Delay-Line Architecture: uentially via analogue LC delay lines; ~24 µs delay per s
• Per-Stage / Total Delay: ~24 µs per stage; ~168 µs total across 7 stages
• Compatible Host Speaker: Quad ESL-63 electrostatic loudspeaker
• Nominal Impedance: 8 ohms (6.2 ohms minimum)
• Power Handling: 100 W / 10 V rms / 40 V peak maximum signal input

Specifications

• Compatible Brand: Quad
• Colour: green
• Compatible Model: ESL-63 Delay Line
• Country of Origin: United Kingdom
• Year Manufactured: 1980s
• Compatible Host Speaker: Quad ESL-63 electrostatic loudspeaker
• Audio Inputs: 2
• 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)
• 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")
• Host Speaker Power Handling: 100W / 10V rms / 40V peak maximum signal input
• Host Speaker Sensitivity: 86 dB SPL / 2.83V rms / 1 m
• Host Speaker Frequency Response: 35 Hz – 20 kHz (–6 dB points)
• Country of Manufacture: England
• Host Speaker Production Years: 1981–1999