Quad (Acoustical Manufacturing) · Quad valve era

Quad I Control Unit and Amplifier

The first Quad-branded electronics (1951-1953) - only 2,000 built, so it is rare rather than merely old.

Catalogue code: Quad I
Years: 1951–1953
Type: valve integrated amplifier
Valves & speakers: Combined mono control unit and amplifier, 2,000 built
Lifecycle: retired
Confidence: High

Specifications

Technology: tube
Channels: 1

Safety

UK valve chassis: mains-derived HT rails stay charged after switch-off; original Hunts/TCC/Erie capacitors and the mains transformer are the two failure points. Value is set by untouched transformers and original cosmetics (silver/black livery), not by the valves fitted.

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 1951; 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.