Nagra III - Tape Transport Mechanism

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Page

6

Do

not

use

this

position

for

high

quality

feed

to

another

unit.

During

Hi-

Fi

Play-

back

these

sockets

carry

the

normal

line

output

signal.

15)

Tension

Pulley

This

pulley

is

movable

and

controls

the

take-up

spool

clutch.

The

normal

tape

tensions

are

given

in

the

speGification

of

the

instrument.

16)

Tape

Transport

Control

Turning

this

control

which

is

marked

on

one

side

IIEn_Onlt

clockwise,

brings

the

pinch

wheel

into

contact

with

the

capstan.

Turning

it

to

the

left

disengages

it,

and

starts

rapid

tape

rewinding.

This

occurs

when

the

selector

switch

(No.9)

is

turned

to

either

play-back

position,

rewinding

does

not

take

place

when

the

switch

is

on

Ilrecordlt,

to

diminish

the

possibility

of

mistakes.

If

re-

spooling

is

required

when

the

switch

is

at

ItTestinglt

this

can

be

obtained

by

depressing

the

accelerator

button

(No.8).

When

the

equipment

is

not

in

use,

this

control

must

be

left

in

the

mid

position.

(See

page

1).

17)

Pinch

Wheel

This

rubber

roller

presses

the

tape

against

the

capstan

to

drive

the

tape.

It

is

operated

by

the

control

mentioned

above

(No.

16)

The

pressure

of

the

pinch

wheel

can

be

adjusted

by

means

of

a

screw

on

the

assembly.

(1

kg

optimal).

'

18)

Capstan

This

drives

the

tape

at

a

constant

speed.

19)

Play-back

Head

20)

Neopilot

Head

21)

Record

Head

22)

Erase

Head

23)

Flutter

Filters

These

carry

markings

which

enable

the

tape

speed

to

be

checked

strobosco-

pically.

When

lightened

by

a

pulsed

light

source

(e.

g.

from

an

electric

lamp,

preferably

fluorescent,

supplied

from

50

or

60

c.

p.

s.

mains)

they

give

the

impression

of

being

stationary,

if

the

tape

speed

is

exactly

correct.

On

the

other

hand,

if

the

dots

appear

to

turn

slowly

clockwise,

the

speed

is

too

great,

and

conversely.

The

number

engraved

on

the

top

of

the

guide

gives

the

mains

frequency

for

the

correct

speed.

To

appreciate

the

magnitude

of

error

of

speed,

at

50

c.

p.

s.

a

movement

of

one

dot

over

a

distance

equal

to

the

separation

between

dots

in

one

second

indicates

an

error

of

1%.

If

the

time

taken

is

ten

seconds,

the

error

is

0,

1

%.

It

must

be

taken

in

account

that

the

mains

stability

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