STIJDtrR Rd/OX
c274
1l
tu:=,JFFäSJ"F-9r".*är"r-FJtpJL,.,=
The C274
tape
recorder
requires
no
regular
maintenance
Bther
than
occasional
cleaning
of the
cepstan sha{t,
the
pinch
roller,
the scundheedst
and
the täpe
guides.
änd denagneti=ation
af all
metal
parts
that
come
in contact
with
the tape.
For this
purpose
we recommend
the REVBX
cleaninq
kit
tpart
No, 3?üOS),
Cleaning
Hoigten
a
felt stitrk
with
cleÄninq
{Iuid
and
clean
all
tape
guidance elements.
Then
dry
the
cleaned
parts
with a
new. clean
felt
sr*ab or
cleaning
web.
Inportant:
Hal.:e sure
that
no cleaning
{tuid
penetrates into
the
bearinq
t:f
the capstän
sha+t
because
this
wolrld
datnage
the bearing=.
Demagnetizing
Switch
sff the
tape
recorder
and
move
the
täpe
gu{{iciently
{ar awäy
from the
reccrder-
Slowly
move
the tip
o{ the
enerqized choke
into
very close
proximity
of
the
part
to be demagnetized
and
after
a brief
tnotnent retract
it slar"lly.
Repeat
this
procedure
for all metal
parts
thät cotne
in
contact
with the
tape {soundhEadsr
tape
guidance elernents.
guide
rollers.
li{ting
pin}.
hlithdraw
the
chBl:e
+rstn
the recorder
{approx.
5B cm)
be+Bre
you
switch it
o{f-
traution:
The
demagneti:ing
choke also
demagnetize5
your
tapes
i{ the
choke cotnes
trlcse to
the täFes!
Ir-es.k---q-p-"n.f-"i-s.,qr-e-t-i-,o*n-
The
track
configlrration
of the C774
i5 shr:wn
in the
diagram
Play Reverse
I For
reproducing
tracks
2 end
quartsr
track
sterto mächine
around.
4! the
tape
of a
mugt
be turned
The tracks
are O.9
nm wide and
exäctly
match the
tracl.: con{igurätion
a
quarter
track
stereo
machine
c?7O and 877.
Recordings
that are
made
with
a C
27O or
877
quarter
track tnachine
can
thus
be
reproduced
on
ä f, 774.
Conversely!
recordinqs
c+
a
C?74
can be reproduced
by a
quarter
track
machine
t=ubiest to Eome
limitations:
level
gomewhat
t6tr
low),
The trach
con{iguration
of a
quarter
track
sterecr marhine is illugtrated
below.
Equal
i zati ons
(
I--E9,...-N-ßP.1.
Fsr
carrecting the
frequency
responser
internationaLly
standardized
equäliEation
networkg
are
br-rilt into
the record
and reproduce
path
of
the
täpe
recarders, The
ättack
points
of the
correction
circLlits
are
re{erred to as
transition
freguencies
or transil--ion
time
constants
and depend
on
the
taFe
speed. They have
been standardi:ed
by varioug
{rrgänizätiong
{IEC, NAE,
AES, CCIR} as
+Ellf]ws:
In
the C?74 tape
recorder, the
equalieation
netrrorl*:s
are
plugged
into the FECORD
CONTRAL
BOARD
1.777.77['DA and the
FLAY AFIPLIFIER
BOARD
1.777,74ü.o,Ü..
Thankg to this design
it is
possible
to
convert
your
recordsr to different
speeds
or to
other
equalization standerd.
The
REVDX C274 teFe recorderg
can
easily be
converted
to sther tape
=peeds.
Yt:u will
only
need
the trorresponding
plug-in
boards for
the desired
tape
speeds of the appliqable
equalization
=tandsrd
{IEC or NAF).
The
equelizätitrn network
{or one
channel
is
imFlemented
on Ä
pigqy-back
plug-in
board.
This
means
that
you
need 4
piggy-back
plug-in
boards
+trr
the
record
Fath
and
? ft:r the
reproduce
path.
Spur
1
--r_
Spur
2
-
Spur
3
-
Spur
4/
Play Reverse
--
O,9mm
-'---O,8nm
0,9mm
+
--
0,8mm
-
0,9mm
-.........-..----
o,8mm
....-
0,9mm
+
SOur
1
--___
Spur 2
---
Spur
3
-
Spur
4/
--
1,Onm
linker Kanal
-s
o,7mm
---lpmm
rechter Kanal
*
................-
1.0mm
rechter
Kanal
=.=--o,7mm
-.-
1,0mm
linker
Kanal
*
TAPE
TRANSITION
FREGIUENtrY LOI,I
AND
HI6H
(TRANSITION
TIHE
CONSTANTEi}
IEC_1?6El
NAE_1945
9rA
cm/s
3.75 ips
50 Hzi 1768
Hs
(_lEiüusl
90tts)
50
HEi 1768
Hz
iJlEBps;
9Ousl
Ig
trmfe
7.5 ips
5O Hz; ?237
Hz
(o;
TOpsi
5O
Hzi 5183
Hz
t.llEtrps!
s0ttEi
3€l
cm/=
15
ips
50 H"; 4547
Hz
{o;351ts}
5O
Hzi
-118-3
Hz
tSlBOps: 50ps)
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