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Precision cannot be realized without ruggedness. This is the reason why all important parts of the B77 Transport mechanism are made from solid diecastings.

In 1967 STUDER REVOX had already ushered in the age of electronic capstan speed control for domestic tape recorders. Ever since then many have tried to copy it yet they have never been able to match its simplicity and effectiveness.

The principle of electronically regulating a sturdy asynchronous motor by means of a separate precision reference has stood the test so well that it has been adopted for the STUDER professional tape recorders years ago. The capstan motor and its precision reference combined with the inductive speed sensor and its control circuits form a regulating loop which is highly insensitive to variations in power line voltage and frequency or changes in load. This system, which has proven its reliability in more than half a million tape drives, combined with ideal tape guiding results in outstanding motion stability (freedom from wow and flutter which remains unchanged for years. The remarkable mechanical and electronic stability of the complete tape transport mechanism makes it well suited for mobile operation by powering from car batteries in conjunction with an inverter.

Direct drive capstan motor with tacho generator and servo electronics to ensure outstanding speed stability independent of variations in load or changes in the electrical supply voltage or frequency.

Magnetic tape recorders are an outstanding example of the perfect combination of precision mechanics and top performing electronics. Even the best electronic circuitry would soon become worthless if the original precision in tape guiding is lost as a result of insufficient long term stability. One of the basic requirements, therefore, is to ensure stable performance for years with a rigid mechanical design which disregards the possible advantages that may lie in 'such tempting advertising claims as 'feather weight' and "slim line?!

For pitch matching or to achieve special effects, motor speed can also be varied continuously over a wide range with the help of an external speed control.

The Revodur all metal heads for recording and playback, the erase head, the infrared tape sensor and the tape guides; all these components are mounted on a rigid diecast frame.

The fourth magnetic head is intended to record slide synchronizing pulses (DIA/DHA/FH).

Well-proven mechanical concept
REVODUR long-life heads
Speed control via servo electronics

No ferrite heads; Revodur sound heads instead - built to professional standards
REVOX sound heads are of the all-metal type. Their construction is identical with that of the well proven heads as used in STUDER professional tape recorders world-wide.

The illustration shows a REVOX stereo sound head side by side with a professional 16 track head for 2 inch wide recording tape.

1.
The milled core shell, machined to extreme dimensional accuracy, insures best possible uniformity for each track. Optimal workability of the gap areas guarantees a perfectly in-line gap.
2.
The nonmagnetic gap of a playback head is only 0.08 mil (2 µm) wide. By comparison, the human hair is 1.5 ... 2.5 mil (40...60µm) "hick".
3.
Magnetic core laminations made from high quality magnetic material of high permeability for low conversion losses (minimal noise voltage and low distortion).
- Long pole pieces for ruler-flat frequency response down to the lowest
..frequencies.
- Head shell and magnetic core have closely matched wear
..characteristics, thus insuring long head-life.

STUDER REVOX heads are made by adhering to the company's own manufacturing process.