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Page 7
is n ot perfect. Variations of 0,5% are quite common. The speeds are set
at t he 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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