Quad (Acoustical Manufacturing) · Quad electrostatic speakers

ESL-63

The ESL-63 replaced the ESL-57 after 24 years and kept Quad's electrostatic line alive into the 1990s.

Catalogue code: ESL 63
Years: 1981–1999
Type: full-range electrostatic speaker
Valves & speakers: Delay-line electrostatic loudspeaker, 30,650-35,000 built; the successor of the ESL-57
Lifecycle: retired
Confidence: High

Specifications

Technology: electrostatic
Channels: 1
Inputs_outputs: single pair of terminals

Safety

Panel charge from the mains: unplug before handling; loose panels are the dominant repair cost.

01 / Witnesses

What applies here

Marks that can be entered for this maker: Serial number, Model / catalogue number, British capacitor code (Hunts, Mullard), Japanese capacitor code (Nichicon, Chemi-Con, ELNA), EIA component code, Version & era marker.

02 / Bounds

The model year is a floor

Nothing predates 1981; components only push the date later.

03 / Value

What moves the price

Sold-price aggregates are not collected yet, so the archive gives no figure — condition, originality of the transformers and a documented recap move this model more than any list price.