Technics RS-640US Operating Instructions Manual page 6

CHROMIUM DIOXIDE TAPE.
M@ The TAPE selector
In order to assure the best performance when using chromium-dioxde
tape:
1. Playback equalization,
2. Recording equalization and
3. Recording bias
can all be changed at the same time by using the tape selector.
As a result, chromium dioxide tape can be used to obtain clear tone
quality, with very little noise, and a wide dynamic range. Furthermore,
although a time constant of 1204S has previously been used in tape
recorders designed for use with chromium-dioxide tape, this unit uses
a time constant of 7O0uS in order to obtain much better performance
from chromium-dioxide tape.
The characteristics of this unit are adjusted for optimum use with
the following tape:
For the "NORMAL" position of the TAPE selector, standard cas-
sette tape (QP-12R), which corresponds to type C-90 (RT-90):
and, for the '''CrO2" position of the TAPE selector, Technics chro-
mium-dioxide tape (RT-60C).
THE TAPE-END INDICATION LAMP
When, during recording or playback, there is only a small amount of
tape remaining, the TAPE-END indication lamp will flash on and off.
C-60, C-46, €-30.
Notes:
1. The time at which this flashing will begin may vary depending
upon the type of tape and the manufacturer.
2. When some tape cassettes which have a large hub (such as, for
example, TDK SA-C45) are used, the TAPE-END indication lamp
may not flash, or may begin to flash only when there is a very small
amount of time remaining on the tape.
DOLBY RECORDING HINTS
This unit includes the Dolby noise-reduction system, which reduces
tape noise to a remarkable degree.
To briefly describe the way the Dolby system operates, at low signal
levels (where tape noise is most noticeable), it increases the level of
the high-frequency portion of the sound and then records the sound.
Then, during playback, by reducing the level of only that portion which
was increased at the time of recording, the tape noise can be reduced
by that same amount.
elf Dolby recordings are made under conditions in which the record-
ing sensitivity varies, or in which the frequency response is not
flat, the Dolby system cannot function with sufficient efficiency.
When, forexample, recording sensitivity is high, the treble range will
be overemphasized. And, if frequency response is poor, it will be-
come even further deteriorated. It is important, therefore, that the
selection of the setting of the TAPE selector, and the choice of the
tape to be used, be made with deliberate care.
e if, when a tape is recorded by the Dolby system, a memorandum is
written on the cassette, accidental playback in the ordinary (non-
Dolby) way can be avoided.
MEMORY REWIND
The Memory Rewind system can be used to conveniently return the
tape automatically, during rewind, to any desired position.
Convenient uses of the Memory Rewind system
1. To return to the beginning of a recording and play it back immedia-
tely after making the recording.
2. To repeatedly begin playback many times from the same position.
How to use the Memory Rewind system
"ON" position.
Notes:
1. Tape movement will stop immediately as soon as the TAPE
counter shows any number from 900 to 999 during rewind if the
MEMORY-REWIND switch is on. Be sure that the MEMORY-
REWIND switch is off at all times unless it is being used for
memory rewinding of the tape.
2. After the tape has been rewound to the position desired, as
described previously, rewind can be continued further, if desired,
by pushing the REW button once more.
3. Tape movement will stop if the MEMORY-REWIND switch is
moved from the "OFF" position to the "ON" position during
rewinding of the tape and the TAPE counter shows any number
from 900 to 999.
4. lf the PAUSE button is pushed during the Memory Rewind
operation (or was already pushed before the Memory Rewind
operation began), the PAUSE button will be automatically
released when the TAPE counter reaches 999, the tape will not
stop at the previously selected part of the tape, and will continue
rewinding until its end is reached, at which time the automatic-
stop system will function.
AUTOMATIC-STOP SYSTEM
FOUR-TRACK, TWO-CHANNEL RECORDING
SYSTEM
The recording is always made on the lower half of the tape width.
Two-way recordings can be made in the following way, Tracks 1 anc
2 are recorded first, and, when the tape reaches its end, turn the
cassette over and re-insert it. Record in the same mamer as before
The other two tracks will then be recorded.
(Although this cassette stereo tape deck has the 4-tracks ystem, tracks
1 and 2, or tracks 3 and 4, cannot be separately recoded.)