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3-6
SYNTHETIC
REVERBERATION
Special effects, similar to those obtained through the use of
an
echo
chamber can
be
created easily.
Connect a microphone and set the program level as usual; then connect
the
OUTPUT
conneccor
co
the
LINE
lNPUT
conneccor,
turn
the
MONITOR
SELECTOR switch
co
TAPE, and
scare
recording.
The
re-
verberation decay race, which
is
the time required for the echo
co
die
away, can be varied with
che
UNE
REC LEVEL control.
The
Control
value chosen
wiU
depend entire
ly
on
the effect desired.
If
the control
i.s
sec
coo
high, continuous oscillation will result, and the v-u meter needle
will swing to maximum and remain there.
If
this happens, adjust ro a
lower setting.
IV. Tape Transport Assembly
The
cape transport mechanism incorporates a single-speed synchronous
mocor and a system
of
pulleys, belts, and clutches
co
drive the capstan
and the turntables. Three modes
of
tape mocion ( PLAY,
REWIND,
and FAST
FORWARD)
are determined by two controls located
on
the cop panel
of
the tape transport.
(The
n
eut
ral position for each con-
trol
is
marked by a doc.)
The
bracketed numbers in this section refer to pares shown in Fig. 4-1,
Fig. 4-4, and in the parts list
at
the end
of
this manual. For greatest
facility in following the discussion below, it is suggested that Fig. 4-4
be opened fully for ready reference.
Power
is
applied to the drivemotor (
63)
when the
POWER
switch
on
the front panel
of
the electronic assembly
is
turned to the
ON
position.
The
capstan (
42)
begins
co
rotate imn~ediacely, being driven
by
a
nyl
on belt (
68)
which runs between the motor pulley ( 61) and rhe
capstan flywheel. A second belt (
69)
running in a groove in the cap-
scan flywheel drives the play takeup pulley (
40).
The
shock relief
brake rollers (
2)
are engaged against the rubber-tired fast forward and
rewind clutches ( 16 and
31).
Both rurntables are motionless, a
nd
che
machine
is
in standby
co
ndition.
Since the capstan
is
in mocion when the machine is in the standby con-
dition, the tape will acceler
ate
to full play speed almost instantly when
the PLAY switch
is
operated, thus producing a wow-free scan.
When
the PLAY control
is
energized the following mechanical se-
quence occurs:
1)
The
play takeup pulley (
40)
and belt (
69)
are brought
co
bear
on
the play takeup clutch
(19).
2)
The
shock relief brake roller (
2)
on the play takcup side
is
re-
leased from the fast forward clutch tire (
16).
3)
The
capstan idler (
79)
engages the capstan (
42),
which drives
the cape, pulling it from the tape supp
ly
turntable ( i.e. the rewind
turntable) and feeding it
co
che
takeup turntable, which now be-
gins
co
rotate. It
is
especially important
co
understand that when
the machine
is
operating normally
in
the play mode, in which the
cape
is
clamped against the capstan by the capstan idler, the turn-
tables are effective
ly
isolated from each other.
The
takeup turn-
table, as its name implies, does nothing more than cake
up
the tape
fed to
it
by rhe capstan. It does nor pull the tape from rhe rape
supply turntable.
4)
The
shock relief brake roller (
2)
on
the rewind side remains en-
gaged against the rewind clutch tire (
31),
and slippage occurs
between the clutch and disc assembly (
30)
.
The
friction produced
in this slippage, and
che
friction produced by the rewind holdback
brake
(37)
operating
on
the bakelite
drum
(35)
provide the re-
quired holdback tension.
GENERAL
STANDBY
OPERATION
PLAY
MODE
4-1
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