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The recording amplifier when on IITestingl1
The play-back amplifier on "Record" "Automatic Record" and "Play-back
and Batt. Meter " .
The line amplifier on "Hi-Fi Play-back"
The normal output level is approximately 250 mY. One can use this output
to connect the Nagra to an external power amplifier.
A 1 arm S i g n a 1 . This signal is injected between the lower socket of the
monitoring output and earth, when the motor speed stabiliser reaches the bottom of
its range, that is, during fast rewind and in case of exhaustion of batteries or
accidental braking of the motor. If one uses this output for connection to a power
amplifier, the alarm signal can be quite annoying. In order to avoid this, one
connects the external amplifier between the earth on the line input on the right side
of the apparatus, and the upper socket of the monitoring output.
14) a. Line Input
This input is at high impedance and one can connect
it,
for instance, to a radio
receiver to record a transmission. The input impedance is 100.000 ohms and
the normal level 0, 5 volt.
b, Accessory Socket
The corresponding plug is a Tuchel T. 3400. The connections are shown on
the surrounding label as follows:
1. o Batteries
taken direct to the negative of the internal battery. This can
b
p
used for recharging internal accum ulators
if
they are
employed in place of batteries.
2.
o Earth
=
the positive of the battery is connected to earth.
3. o Line
This line input is similar to the line input mentioned above
but the impedance is 2500 ohms and the normal level 8 mY.
This is for use with the Nagr
a
accessories such as external
m ic rophon e pr earn plifi e r.
4. o Stop
connection for remote control - if reconnected to earth the
motor will stop.
5. o External
=
This is the connection for the negative of an external power
supply. The
a
pplied voltage should be between 12 and 24
volts DC and must not exceed 25 volts.
6. o
-10.5V
regulated voltage for supply of accessories.
c) Balanced Output
This line output is symmetrical and floating. The characteristics are marked
on the label:
with a load not less than
600 ohms
4, 4 V
(+ 15 db)
0
r
"
"
"
"
"
100 ohms
1,55 V
(+
6 db)
a
At this socket the following signals will be found:
During testing and recording. the signal applied to the
recording head. One should not load these sockets during
this operation. (Except when a DH amplifier is used).
During Play- back
&
Batt. Meter the signal feeding the
with reduced reserve of the level.
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