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3.16 POWER On /Off Switch
Pressing this lock-down pushbutton into down-position switches on the
power supply of the SG 631 LOGIC. The level meter and the function
indicator above the STOP key will then light up, as well as one of the
two MONITOR function indicators and one of the function indicators for
the reel-size switch. Pressing the POWER button once more switches
off the power supply, and the button will return to its up-position.
3.17 Headphones Volume Control ©
This knob is for linear volume regulation of stereo headphones con-
nected to the SG 631 LOGIC. Turn the knob clockwise to increase
the volume, anti-clockwise to decrease it.
3.18 CUEING Switch ®
"Cueing" in the sense of "giving the signal or key-word to begin" gives
the best idea of what happens in the CUEING process. A certain spot
on a recorded tape is located in order to begin a new recording or to
begin playback of a particular passage, or to edit (splice) tape: as is
everyday practice in professional studio recording.
The approximate location of a particular spot on the tape can be ac-
complished by using the fast-forward or rewind modes plus the index
counter. For exact location, however, switch the SG 631 to PAUSE and
playback, then activate the CUEING switch (turn switch to position 1);
the tape reels may then be turned by hand. Slowly turning the take-up
reel with one hand while slightly braking the supply reel with the other
permits the playback to be heard at relatively normal pitch.
Pressing this button will record a slide-changing pulse (1 .kHz) on the
control track of the tape if the mode selector (§) is set to DIA (to switch
on the control signal generator) and the RECORD key @ has been
actuated.
3.20 OUTPUT LEVEL Control @
Turning this switch sets the output signal delivered to the RADIO socket
and permits matching the output level of the SG 631 LOGIC to that
of a second sound source when connected to an amplifier not equipped
with a variable input level control. With the volume control of the
amplifier in the same position when switching from tape playback to,
for example, phono playback, the volume level should remain unchanged.
With the output level control in middle position, an output signal of
750 mV per channel is delivered to the RADIO output socket. Turning
the level control clockwise raises the output voltage (up to approxi-
mately 1.2 V per channel). Turning it anti-clockwise lowers the output
signal (down to approximately 500 mV per channel).
3.21 TAPE SELECT Switch
Turn switch to set the machine to standard ferric oxide tape (Fe-
position) or to ferrichrome tape (FeCr-position). The latter has two
magnetic coatings and a high frequency output of approximately 4 dB
better than that of standard tape.
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