Revox (Willi Studer) · Revox tape decks

A77

The most successful professional-grade tape deck ever sold to home users: 290,000 units in ten years, with Swiss (S) and German (G) assembly lines running in parallel.

Catalogue code: A77
Years: 1967–1977
Type: reel-to-reel tape deck
Valves & speakers: Three-motor reel-to-reel deck, quarter-track stereo (also half-track variants), speeds 3 3/4 and 7 1/2 ips (plus 1 7/8 and 15 ips variants); about 290,000 built
Lifecycle: retired
Confidence: High

Specifications

Speeds_ips: 1 7/8, 3 3/4, 7 1/2, 15 (version dependent)
Channels: 2
Heads: 2 or 3
Technology: solid-state
Inputs_outputs: DIN line in/out, headphone, mic

Safety

Tape deck: head wear (check the head face for a flat), capstan shaft and pinch roller condition, belt/idler kit and motor bearings decide the price; A77/B77 motor boards carry mains-derived voltages - never service with the case open and powered.

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, Chassis / platter stamp, Version & era marker.

02 / Bounds

The model year is a floor

Nothing predates 1967; 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.