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The Revox B77 is a classic stereo reel-to-reel tape recorder introduced in the late 1970s as part of Revox's B-series hi-fi range. It uses a three-motor tape transport with two AC winding motors and one electronically controlled AC capstan motor, providing excellent speed stability and low wow and flutter. The machine is built on a rigid aluminium die-cast chassis and head block for long-term mechanical stability and precise tape guidance. It is a three-head design (erase, record, playback) enabling true off-tape monitoring during recording. The standard stereo versions offer two tape speeds, typically 3¾ and 7½ ips (9.5 and 19 cm/s), while other factory variants provide low-speed (4.75/9.5 cm/s), high-speed (19/38 cm/s), and super-low-speed (2.38/4.75 cm/s) options. It accepts reels up to 10.5 inches (26.5 cm) in diameter. Frequency response for the standard-speed stereo versions is up to 30 Hz-20 kHz at 7½ ips, with signal-to-noise ratio around 67 dB and total harmonic distortion about 0.5%, depending on configuration. The heads are made from a high-quality alloy (often described by Revox as Revodur or permalloy) designed for long life and professional electromagnetic performance. Typical dimensions are approximately 452 x 414 x 207 mm and weight around 17 kg, matching Revox's own data for the B77 Mk I/Mk II. Widely regarded for its robust construction, transport precision, and studio-grade audio performance, the B77 became a benchmark home and semi-professional open-reel recorder and was later complemented by derivatives such as the PR99 and higher Mk versions. The original B77 production has long since ceased, but Revox and specialist firms have supported it with service and, in some cases, updated Mk III-based units for new production runs.
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Components that show up alongside the B77 in real systems. A verdict means the pair has been checked for compatibility and headroom — open it to see how the two get along.
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The C270's wow & flutter is 0.050% against the B77's 0.080%, its signal-to-noise 65 dB against 67 dB, its thd 0.600% against 0.500%, and its weight 23 kg (51 lbs) against 17 kg (37 lbs).
The A77's wow & flutter is 0.100% against the B77's 0.080%, its signal-to-noise 58 dB against 67 dB, its output voltage 2.5V RMS against 1.6V RMS, and its weight 15 kg (33 lbs) against 17 kg (37 lbs).
The MX5050 BII-2's wow & flutter is 0.060% against the B77's 0.080%, its signal-to-noise 66 dB against 67 dB, and its weight 30.84 kg (68 lbs) against 17 kg (37 lbs). Both share thd (0.500%).
The RS-1506US's signal-to-noise is 57 dB against the B77's 67 dB, its thd 0.800% against 0.500%, its output voltage 0.8V RMS against 1.6V RMS, and its weight 25 kg (55 lbs) against 17 kg (37 lbs).
Akai GX630D
Otari MX5050 B2III
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