Revox A 36

The Revox A36 is the original model in the Revox 36 series, first introduced in 1956. It laid the foundational design and engineering principles that defined the entire 36 series, evolving through later iterations like the D36, E36, F36, and G36. The A36 is prized for its all-tube electronics, solid build quality, and reliable performance.

Core Technical Specifications

• Track Format: 2-track (twin-track, mono or stereo)

• Tape Speeds: 3¾ and 7½ inches per second (ips), selectable by pole-changing on the synchronous capstan motor.

• Reel Size: Accommodates reels up to 10.5 inches (26.5 cm)

• Motors: 3 motors total — two identical motors for rewind and tension; one large capstan motor (pole-switching synchronous type)

• Wow and Flutter: Around 0.1% at 7½ ips

• Frequency Response: Approximately 40Hz to 18kHz at 7½ ips

• Signal-to-Noise Ratio: About 52 dB

• Total Harmonic Distortion: Around 3%

• Crosstalk: Approximately 40dB

• Inputs: Line input 50 mV, microphone input 3 mV

• Outputs: Line output 0.7 V (RCA/phono connectors)

• Output Power: 6 watts, with a built-in 210 mm (8.3 inch) speaker

• Valve/Tubes: Typically includes ECC81, ECC82, ECC83, and ECL86 tubes, total around 12 valves in the amplifier section

• Dimensions: About 480 x 340 x 300 mm (18.9 x 13.4 x 11.8 in)

• Weight: Approximately 20 kg (44 lbs)

• Finish: Usually grey

Mechanical and Electronic Design

• The tape transport is precision-engineered with an all-electrical direct-drive capstan motor and heavy-duty solenoid pinch roller providing stable tape speed and gentle tape handling.

• The capstan motor is hysteresis synchronous with 6 or 12 pole stator windings for speed change.

• The tape path is rigid and stable, with the transport mechanism, capstan, pinch roller, and heads mounted on a die-cast frame for permanent alignment.

• Mechanical brakes are electrically controlled by solenoids for automatic engagement and release.

• Controls are push-button operated with end-of-tape sensing.

Features and User Interface

• Stereo or mono tape playback and recording (depending on tape configuration).

• Push buttons for play, stop, rewind, and fast forward.

• Three-digit mechanical tape counter with reset knob.

• Tension and brake controls for compatibility with different tape types.

• Built-in monitoring amplifier and loudspeaker for playback monitoring.

Legacy and Importance

• The A36 set the basis for the entire Revox 36 series, which became widely recognized for quality in the semi-professional and audiophile markets.

• Though it predates later refinements found in D36, E36, and F36 models, the A36's design principles remain key for stable and high-quality tape operation.

• It was among the first to feature built-in loudspeaker monitoring with a robust 6W amplifier.

• The all-tube amplification design was highly regarded for its warm, musical sound.

• The precise mechanical engineering makes it a durable and reliable classic tape deck suitable for true vintage audio enthusiasts.

In summary, the Revox A36 is a pioneering tube-based reel-to-reel tape deck from 1956, offering robust mechanics, stable synchronous motor-driven tape transport, and solid audio performance. It remains a respected vintage machine for collectors and those interested in the early days of high-quality tape recording.

This overview reflects the foundational characteristics of the Revox 36 series upon which all later models were built.