Philips N 7150 - Specialized Recording Modes; Sound-on-Sound (Multiplay) Recordings; Echo Recordings; Maintenance and Specifications

@ To stop playback, press stop button @.
Sound-on-sound (multiplay) recordings
itis possible with this facility to make several different recordings
which may be synchronised and combined with each other to form
a single recording on one track. It is therefore possible to make a
recording of, say, a quartet in which all the instruments are played
by the same person.
To make a sound-on-sound recording with, say, a microphone,
proceed as follows:
First recording - fig. 7A
@ Connect a microphone to socket (2.
@ Settape speed selector (4 preferably to the highest tape speed.
@ Set tape counter (4) to zero by pressing the zero reset button.
@ Set track selector @ to 1-4’.
@ Make a normal mono recording on track 1 of e.g. the drum
accompaniment.
Second recording - fig. 7A
@ Rewind the tape to the zero-position of tape counter (4).
@ Connect headphones to socket @9.
e@ Set monitor selector @ to ‘source’ or ‘automatic’ and let it
remain in this position during recording.
@ Set track selector (9 to '3-2’.
@ Connect with the aid of an additional connecting lead the right
line input socket G) to the sound-on-sound (multiplay) socket @9
(fig. 2).
In fact you will make a mixed recording on track 3, consisting of the
second microphone recording of e.g. the trumpet and the first
microphone recording of the drum, which will be transferred from
track 1 to track 3.
During the second recording, you will hear the first (drum)
recording through the headphones, so the second (trumpet)
recording will be synchronised with the drum accompaniment.
The recording level of the new microphone recording should be
adjusted with the left recording level control © and the level of the
signal being transferred from track 1 to track 3 can be adjusted
with the right recording level control ©.
@ Set the recording level of the new microphone recording lower
than normal, because the signal to be transferred will be added to
this. During recording, the mixing ratio can be monitored by
headphones and if necessary corrected with the controls © and
@. The illuminated recording level meter indicates the sum of the
two signals and must be adjusted in the normal way as stated in
chapter ‘Recording’.
@ Now make the new (trumpet) recording, adding th old (drum)
recording to it, on track 3.
@ If the second recording is unsatisfactory, it may be remade
since the preceding recording on track 1 has not been erased.
Third recording - fig. 7A
@ Rewind the tape to the zero position of the tape counter (4).
@ Set track selector @9 to ‘1-4’.
@ Proceed further as indicated under Second recording’, making
the new recording and adding the earlier recordings, on track 1.
Proceed with further recordings in the same way. Do not forget to
move the track selector (5) to the other track position before
making each recording. Note that for the second, third and
subsequent recordings the monitor selector @ must stay at either
‘source’ or ‘automatic’.
If the last recording is unsatisfactory, it may be remade again and
again, since the preceding recording had not been erased.
Theoretically, this process could be continued indefinitely, but
transfer loss (the progressive deterioration in the quality of sound
with each copy made of a recording) imposes limits in practice. To
keep loss to a minimum, the highest tape speed should be used
and the most important instrument or voice part recorded last of
all.
When a sound-on-sound recording is finished, always remove the
plug from the sound-on-sound socket @9.
6
Playback of a sound-on-sound recording - fig. 7B
Playback of asound-on-sound recording takes place in the normal
way with the track selector (19) in the position last used. The second
last recording can, if desired, be erased or it may be replaced by
another mono recording.
Echo recordings - fig. 8
Recordings with echo may be made with this recorder, due to the
fact that the apparatus is equipped with separate heads, mounted
in line, for recording and playback. In the making of a recording
with echo, the signal just recorded on the tape by the record head
© (fig. 9) is reproduced immediately by the playback head ©),
returned to the record head and then recorded together with the
original signal (fig. 8).
The echo effect is made possible by the fact that the two heads are
a finite distance apart, and its character is influenced by the tape
speed. At the relatively low speeds of 4.75 and 9.5 cm/s, a slow
echo is obtained, whilst at the high speed of 19 cm/s, arapid echo
(reverberation) is obtained.
Anechorecordingis in fact a mixed recording, and the mixing ratio
between the echo signal and the original signal can be adjusted.
Echo recordings can be made in stereo and mono alike, but only
through the microphone inputs @ (3.
@ Connect the microphones to the inputs (3 (9.
@ Interconnect the line-out sockets @9 or the monitor sockets
with the line-in sockets @), using a suited connecting lead.
@ Set the tape speed selector (19 to the speed desired.
e@ During echo recordings, monitor selector must stay in
position ‘tape’.
@ The recording level is adjusted with the recording level controls
© and the line-out level control @. Set the recording level of the
microphone signal to a lower value than normal, since the echo
signal is added to this during recording.
e Start the recording. When monitoring through headphones,
you can adjust the mixing ratio between the microphone signal and
the echo signal with the recording level controls @ and the line-out
level control @. The recording level meters indicate the sum of
both signals and the level may further be adjusted as indicated in
chapter ’Recording’.
Maintenance
Itis advisable to remove at regular intervals the dust and dirt from
the magnetic heads and other parts with which the tape comes
into contact. This should be done after about every 50 hours of
operation, which, in normal circumstances, will be about once per
month.
Use a soft cloth or cotton bud lightly moistened with alcohol,
methylated spirit or a fluid specially made for this purpose. Use no
materials other than these and avoid touching the heads with
sharp or metallic objects.
Clean the tape tension stabilisers @, the front of erase head@) (fig.
9), record head (0), playback head ©), the tape guides ®, the pins
©, the capstan ©), the switching contact © and the rubber sides
of the pressure roller @ (for this, switch the recorder in the
play/pause position without any tape inserted).
After cleaning, rub the heads @) © © with a dry cloth.
Do not lubricate the apparatus. It is recommended that the
machine is checked by a service engineer about once per year.
Technical data
Subject to change without notice
@ Adjustable by your dealer for mains voltages of 110, 127, 220,
and 240 V.
@ Suitable without switching for 50 and 60 Hz A.C.
e@ Power consumption approx. 23 W.
@ Four-track system.
e@ Suitable for reels up to 18 cm.
e@ Permissible tape thickness 25 to 55 micron (um).
@ Frequency range according to DIN 45 500:
19 cms: 35-25 000 Hz;
9,5 cm/s: 35-18 000 Hz;
oT