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Nagra III - Spool Details and Battery Types

Nagra III
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Page
7
is
not
perfect.
Variations
of
0,5%
are
quite
common.
The
speeds
are
set
at
the
factory
by
comparison
with
a
standard
generator
driven
from
a
Quartz
crystal
clock.
Therefore
the
speed
should
not
be
readjusted
if
the
mains
frequency
is
not
known
to
be
accurate.
24)
Feed
Spool
The
tape
to
be
recorded
or
reproduced
is
placed
on
this
spool,
with
the
coating
(matte
surface)
wound
inwards.
25)
Take
Up
Spool
The
Battery
Box
compartment
is
accessible
from
the
bottom
of
the
instrument.
A
normal
set
of
batteries
consists
of
12
1.5
volt
torch
cells.
When
changing
cells,
all
should
be
changed
together,
as
one
inferior
cell
will
substract
from
the
performanc
e
of
the
good
ones.
It
is
very
important
not
to
make
any
mistake
over
the
polarity
of
the
batteries,
all
should
be
turned
in
the
same
direction
as
indicated
by
the
diagram
on
the
bottom
of
the
box
.
It
is
more
convenient
to
put
the
end
cells
in
place
first,
and
then
the
centre
cells.
The
minimum
voltage
below
which
a
cell
cannot
be
used
is
0.9
volt.
Usable
battery
types
are:
1)
Alkaline
cells
such
as
ever-ready
E95
(life
about
70
hours).
2)
Ordinary
torch
dry
cells,
(diam.
33
mm,
length
60
mm)
(life
about
10
to
20
hours).
U.S.A.
Ever-ready
950
D,
R.
C.
A.
VS.
036
Ray
-
O-Vac
2
LP,
Burgess
2D,
Usalite
879
England
Vidor
V
0002,
Berec
U 2
Germany
Titania
2211
France
Wonder
I!Marin
rr
1602,
Mazda
(Cipel)
RGT
1,5V
Spain
Hellesens
211
Switzerland
Leclanche
300
ou
300
S
Pakistan
Alladin
1, 5 V
cell
India
Ever-
ready
1 F 3
China
Pile
Elephant
1, 5 V
Hongkong
Kai-it
360
Italy
Super
Pila
No.
60
It
is
desirable
to
use
the
steel
clad
type
of
cell,
with
silvered
contacts,
to
avoid
trouble
due
to
corrosion
and
bad
contacts.
3)
Sealed
Accumulators.
These
are
rechargeable.
It
is
often
possible
to
recharge
these
400
times,
although
the
manufacturer
does
not
guarantee
more
than
100
rechargings.
They
have
the
disadvantage
of
a
very
constant
output
voltage
so
that
it
is
very
difficult
to
estimate
the
amount
of
charge
remaining.
Their
capacity
is
comparable
to
that
of
ordinary
cells,
but
they
are
heavier,
increasing
the
total
weight
of
the
Nagra
by
about
1
lb.
3
ozs.
Switzerland
Leclanche
32
A
Germany
DEAC
2,5
Ah
U.S.A.
Gould
2,5
Ah

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