Nagra III - Tension Pulley and Tape Path; Microphone Input and Level Meter

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2

curve

is

always

excellent

and

varies

little

from

tape

to

tape.

At

this

speed

the

tape

is

little

affected

by

repeated

play

-

backs.

Another

advantage

is

that

editing

is

easy,

and

that

a

suitable

machine

operating

at

this

speed

can

usually

be

found

in

studios

for

play-

back

of

recordings.

19,05

cm/sec.

==

7.

5"/sec.

CCIR

Equalization

Standard

This

is

the

normal

speed

for

the

general

uses

of

the

Nagra

in

studios

working

with

the

CCIR

standards.

Where

this

is

not

necessary,

the

following

position

will

be

preferred:

19,05

cm/sec.

==

7.5"/sec.

Ampex

Equalization

Standard

This

is

a

better

standard,

as

the

modulation

noise,

medium

range

distortions

and

tape

backgr'ound

noise

are

reduced

considerably.

9,525

cm/sec.

=

3.75"/sec.

This

speed

is

for

use

where

high

quality

is

not

required

and

tape

economy

is

important.

One

hour

recording

time

can

be

obtained

with

the

use

of

5

11

reels

and

using

extra

thin

tape

or

two

hour's

with

7"

reels.

2)

Tension

Pulley

This

pulley

is

movable

and

operates

a

brake

on

the

spool,

ensuring

constant

tape

tension.

3)

Microphone

Input

The

microphone

should

have

an

impedance

of

50

or

200

ohms.

This

input

socket

on

the

Nagra

is

Cannon

type

XLR

3-42.

The

plug

on

the

microphone

cable

is

Cannon

type

XLR

3-11C.

Contact

No.1

is

earth

and

2

and

3

are

the

microphone

connections.

The

input

is

symmetrical

and

floating,

there

being

no

connection

between

primary

and

earth.

4)

Shoulder

Strap

Button

For

the

attachment

of

a

shoulder

strap

or

ever

ready

case

a

small

set

screw

is

fitted

for

safety

in

the

nut

(3

mm.

Set

screw

,

for

Allen

key

to

DIN

913:

a

key

0.050"

(1.

27

mm)

is

provided).

5)

Modulation

Level

Meter

The

upper

scale

on

the

meter

is

for

measuring

the

input

level

(on

Test

or

on

Record),

and

the

output

level

to

the

line

on

Hi-Fi

play-back.

Normally

the

pointer

will

not

reach

the

black

segment

between

0

and

+2db,

which

is

the

region

of

over

modulation.

The

recorder

has

a

safety

factor

of

about

6

db,

so

that

an

occasional

accidental

incursion

into

this

region

is

of

no

consequence.

The

level

control

should

be

adjusted

so

that

the

pointer

only

reaches

the

black

zone

on

the

loudest

parts

of

the

recording.

6)

Battery

Indicator

The

lower

scale

of

the

meter

is

for

checking

the

state

of

the

batteries.

The

meter

is

connected

to

the

batteries

when

the

selector

switch

indicates

"Play-

back

and

Batteries

Meter",

that

is,

when

playing

back

on

the

internal

loud-

speaker.

The

pointer

should

lie

in

the

marked

segment

when

the

batteries

are

in

working

condition.

This

indication

leaves

a

good

factor

of

safety

when

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