Studer a 80 r mk2 service manual

Page 1

EEB NATUCCDNAL AC§

CH-BIOS Regensdon

SWItzerland
PROFESSIONAL Phon9018402960
AUDIO EQUIPMENT Telex 58489 stuI ch

OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION
A 80 R PILOT-TONE CONTROL SYSTEM, MK II

CONTENTS

1. Application, Special features, Advantages
2. Parts supplied

3. Installation and Wiring block diagram

4. Condensed instructions

5. Pilot amplifier, Data and Adjustment

6. Specification

7. System description
8. Circuit description
9. Capstan control

10. Wiring lists

11. Circuit diagrams

12. Addenda

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STUDERINTERNANONALAG REGENSDORF Page 2

1. Application, Special features, Advantages

The pilot-tone control system is used in conjunction with tape
decks of the A80/R family for synchronising a tape with a
reference signal by means of a recorded pilot tone.

The pilot signal can be replaced by a speed signal taken from
the capstan motor. To regulate tape speed the follower system
employs digital counting techniques followed by analogue pro-
cessing of the signal. The special features of the system
include:

Minimum wow and flutter, regardless of cuts in the tape or
breaks in pilot tone.

- Variable response time of the speed-regulation.

- Memory circuit which maintains the original speed and
synchronism, despite gaps in the pilot signal.

Conditions at start can be selected by "pre-listening" or
with the aid of a regulator.

- Lock" lamp indicates synchronous running.
- False starts can be corrected.

- The feedback signal can be corrected from 50-e60 Hz or from
60-.50 Hz (option).

2. Parts supplied

A 80 R - l : A 80 broadcasting model, mono, full-track

A 80 R - l - P : and also
pilot-tone amplifier 1.080.932
pilot-tone head block 1.020.713

A 80 R - l - PN : and also
follower control conversion kit 1.080.070

comprising follower unit,
follower panel, fitted back
board, etc.

A 80 R - 1 - PNVU: and also

follower control conversion kit 1.080.075

comprising follower unit,
follower panel with VU-meter,
fitted back board, mono cable,
etc.