TANDBERG 62 series is a professional tape recorder that combines high-quality audio with advanced features and exceptional versatility, making it suitable for a wide range of applications. With its improved head alignments and electrical adjustments, the TANDBERG 62 series delivers enhanced frequency response and signal-to-noise ratio.
This device incorporates a separate bias head to improve frequency response and signal-to-noise ratio, and a fully transistorized oscillator for increased reliability and stability. The equalization circuits have been refined to optimize the recording and playback process, ensuring accurate reproduction of audio signals. Additionally, a microswitch in the bias circuit automatically reduces bias in 1 7/8 ips tape speed, optimizing performance for different tape speeds.
TANDBERG 62 series is a professional tape recorder that combines high-quality audio with advanced features and exceptional versatility, making it suitable for a wide range of applications. With its improved head alignments and electrical adjustments, the TANDBERG 62 series delivers enhanced frequency response and signal-to-noise ratio.
This device incorporates a separate bias head to improve frequency response and signal-to-noise ratio, and a fully transistorized oscillator for increased reliability and stability. The equalization circuits have been refined to optimize the recording and playback process, ensuring accurate reproduction of audio signals. Additionally, a microswitch in the bias circuit automatically reduces bias in 1 7/8 ips tape speed, optimizing performance for different tape speeds.
January 1967
TANDBERG
TAPE.RECORDER
Models 64x
and 62x
Alignment
instruction
for
heads
and
electronics
Preface
The models 64x
and
62x
are improved versions
of has been introduced
to improve the frequency
re-
the earlier models
64-62
and this
alignment instruc-
sponse and the signal
to noise
ratio.
tion is
an appendix to
the
service
manual
for
model
The
oscillator has
been redesigned
and
fully transis-
64:-62.
lt
covers the special
head alignments
and torized. Certain minor
changes have been
introduced
electrical adjustments necessary for
model
64x
and
in the equalization circuits, mainly changes
of com-
62x.
ponent
values. A
microswitch
is
further introduced
in
the
bias
circuit
to
reduce
the
bias
in
1.7/e i.
p.s.
The models
64x and
62x
have the
same operation
tape speed. This switch
is
operated
automatically
by
facilities
as 64-62. A new,
and
separate
bias head
the
speed
selector
mechanism. See fig. 3.
Ti.^d.{*..q
r=r=rErlEr/
TANDBERGS
RADIOFABRIKK
A/S
OSLO
NORWAY
1.0 Alignment
It
is important that
the
contact
between
the
tape and
the
heads
on
the tape
recorder is
good.
To
obtain
this
contact the
tape should be run through the
tape
recorder
5-10 times at normal speed
to have the
tape
polished
before measuring
the
frequency
re-
sponse and
the signal
to noise
ratio.
1.0.1 Demagnetizing
Demagnetize
the heads and adjacent
parts
before
aligning
the heads.
1.0.2. The mounling
plate
lor the heads
The
height of the mounting
plate
for the
heads
(15.4)
is
aligned by the adjustment screw
at the
rear
of
the
playback
head. Move
the operating lever
slowly
to
normal forward
drive
with
a
tight
tape
inserted.
Align
the
height of
the
mounting
plate
for the heads
until
the
tape
runs
equidistant
from the
flanges of the tape
guide
(79,2).
1.0.3
The adjustable tape
guide
Set the
operating lever in
normal forward
drive
with
tape
inserted
and depress the
push-button
lll. Align
the
adjustable tape
guide
(79.3)
until
the
tape
runs
equidistant
from the
flanges
of
the adjustable tape
guide.
Repeat
1.0.2.
2.O Adjustment of
the
oscillator and bias head
circuits.
2.0.1 Insert
one
10 ohm resistor
in series with each
bias head half to
ground
and
connect
a V.T.V.M.
across each
resistor.
2.O.2
R 609 and
R
612 is turned up
to
1 o'clock
posi-
tion while R607 and R610 are
set
to approx. 11
o'clock. Rel. fig.
3.
2.0.3 Set
the
tape
recorder
to stereo recording and
the
speed selector
to
7tlu i.p.s.
2.0.4 Use a
calibrated
long wave
receiver, frequency
meter or
frequency
counter for the indication
and
adjust the oscillator
frequency
by
C 610 until f/osc.
=
85.5
kc/s.
2.0.5 Set the
tape recorder
for mono recording
CH
1
and
the
speed selector to 7tlz
i.p,s.
2.0.6
Adjust
the oscillator
frequency with
L601
F/osc.
will
then
be
85.5 kc/s.
2.0.7
Set
the
tape
recorder for mono recording CH 2.
2.0.8 Readjust L
601
to
compromise
if necessary. The
osc.
frequency
deviation between mono recording
CH 1, CH
2
and stereo
should
be less
than
2
kc/s.
The deviation should be indicated
with
frequency
meter, long wave
receiver or
frequency
counter.
2.0.9
Adjust
C 602
and
604
to max. reading on the
V.T.V.M.
(between
100 mV and 400 mV).
3.0
Head
alignment
and track
control
with
Tandberg
Test Tapes,
Model
64x
3.1.
The
playback
head
3.1.1 Connect
one
V.T.V.M.
to each
CATHODE
FOLLOWER
output.
3.1.2 Height
alignment:
Play back
the test tape
No. 1.
This is
a full track
pre-recorded
tape with
1000
c/s recorded
atTt/zi.p.s.
tape speed.
The record level of the
exact
area
corresponding
to track 3 is
reduced
30 dB.
Adjust
the height of the
playback
head
until
minimum output
is
botained on a
V.T.V.M. from
track
3
(ch.
2).
3.1.3
Azimuth alignment:
Play back the test tape No.
2. This is
a
full track
pre-recorded
tape with 10.000
cls al 71lz i.p.s. tape
speed.
Adjust the
azimuth
position
of
the
playback
head until maximum reading
is obtained on both
output
meters.
3.1.4.
Lateral
alignment:
Check
the
lateral
position
of
the
playback
head by
pulling
the
pressure pad
(59.5)
away
from
the erase
head when
the test
tape
No.
2 is
played
back.
The
output level
should not decrease more
than 3 dB.
Adjust the
lateral
position
of
the
playback
head, is
necessary,
by turning the head mounting
plate.
Re-
adjust the
azimuth
position.
3.2
The
record
head.
3.2.1
Adjust
the horizontal
position
of the bias
head
until
the
head is in
center of the record head. Ref.
fig. 1.
3.2.2
Adjust
the height
of
the
bias head until
the
tape
runs freely
in the
groove
in front
of the
bias
head.
3.2.3
Height
alignment:
The
record
head is
set
in a
preliminary position
where
approx.
0.1 mm
(.0025")
of
the
lamination for the
upper track is visible
above the tape. The
position
of
the record
head can
be
inspected
by using the iron
powder
method
(Magna-See).
Record all
four tracks
on the
tape
and dip the tape in the solution. The
pattern
on the tape will
show il the
position
of the
head is
correct.
Readjust
if necessary.
3.2.4
Azimuth
alignment:
Connect
a signal
generator
to the HI-LEVEL inputs
CH1 and
CH2,
and
two
V.T.V.M.
to
the
CATHODE
FOLLOWER
outputs
CH1
and
CH2.
Make a
stereo
recording in
B-test al 7t/z i.p.s. of
a
15.000 c/s
signal.
Adjust
the azimuth of the record
head to
max. reading
on
the
output
meters.
The out-
put
level
should now be approx. 100 mV with the
playback
volume controls
to max.,
readjust
the record
gain
controls until this is obtained and
check
the
azimuth
position
of the record head.
3.2.5
Lateral
alignment:
Check the
lateral
position
of the
record head
by
pulling
the
pressure pad
(59.5)
away
from
the erase
head during the recording.
The output level should
not
decrease
more
than 3
dB.
Adjust the
lateral
position
of the record head, if necessary, by turning
the head mounting
plate.
Recheck the height and
azimuth
position
of
the head. Ref.
para.
3.2.3 and
3.2.4.
3.3
The
bias
head.
3.3.1
Heighl
alignment:
Connect
two
V.T.V.M.
directly across the
recording
heads.
Set
the tape recorder to
stereo
recording at
71 lz
i.p.s.
and turn both
playback
volume controls
down
to
0.
Adjust the height of
the
bias head
by the
height
adjustment screw
(ref.
fig.
1) until max. reading is
obtained
on
both
V.T.V.M.
Check
that
the
tape
runs
freely in the
groove
in front
of
the
bias head and
that
there
is
sufficient
clearance between the bias
head and
the
mounting
plate
for
the record head.
The height
position
of
the
bias head is not
critical,
and
if
the clearance between
the bias head and the
mounting
plate
for the record
head is
insufficient,
raise
the bias head slightly.
3.3.2
Horizontal
alignment:
Connect two V.T.V.M.
to both
CATHODE
FOLLOWER
outputs, and
connect a signal
generator
to the Hl-
LEVEL inputs
CHI and CH2.
Set
the
tape recorder
to
stereo recording al 71lz i.p.s.
and
turn
both
play-
back volume controls
to max.
Record
a 1000
c/s
signal.
Untighten the
fixing
screw
for
horizontal adjustment
(ref.
fig.
'1)
and
move the
bias head from the
extreme
Ieft
position
towards
the recording head
until
max.
reading
is
obtained
on both
V.T.V.M. The output level
should now
be approx..5V,
readjust
the record
gain
controls until this is
obtained and check
the
horizon-
tal
position
of
the
bias head. After
one has assured
that the
horizontal
position
is
correctly
adjusted,
tighten the
adjustment
screw making
sure that
the head is
not being moved.
This is eventually
indicated
by
a
loss
of the output level.
A fine-adjustment
of
the
bias current is
obtained by
the
pot.meters
R609
(CH1)
and
R612
(CH2).
Adjust
R
609 and R
612 until max. reading
on
the optput
meters
are obtained.
3.4 The
erase head.
3.4.1
Height adjustment:
The erase head is
set
in
a
preliminary position
where
approx.
0.25 mm
(.01")
of
the
ferrite core for the
upper track
of
the
erase head is visible
above the
tape. Insert
the test tape No.
9 and
record
a 1000
c/s
signal from the
generator
on
ch. 2 at maximum re-
cording level. Dip
the
tape in
the Magna-See
solution
and
check that the re-recorded
track lies
in
center
of
the
erased track. Make
sure that the
erase head
does
not
erase any
part
of
the adjacent tracks.
3.4.2 Azimuth
alignment:
Align the
azimuth
position
of the
erase head by the
azimuth adjustment
screw. The
erase head
should
be
parallel
with the
mounting
plate
for the
heads
(15.4).
The
azimuth
position
of the erase head is not
critical.
3.4.3 Lateral
alignmenl:
Turn the
head mounting
plate
for the
erase head, until
the front
of
the
head is
parallel
to the
pressure pad.
3.5 Model
62x.
10
000- 5000
-
1C00
-
100-
50-250 c/s
recorded
at71/t
i.p.s. tape
speed. The tape
conforms
with the N.A.B.
standards. The
output tolerance is
-+
2
dB
for
all
frequencies.
The
difference in
level
between the
two
channels
should be less than
3
dB.
4.2
Adjustment
of the
playback
amplifiers:
Play
back
the test
tape No. 4 with
the output
volume
controls
to maximum. This is
a full track
prerecorded
tape
with 400 c/s
at71/z i.p.s. tape speed.
Ad.just the
potentiometers
R233
(CH
1)
and
R234
(CH
2)
until
the
reading
on the
output meters
are 1.3V.
5.0 Adjustment of
the record
current
(A-B
test) and
the
electronic
beam indicators.
Make
sure
that
all adjustments
under
paras
1.0,
2.0
and 3.0 are made before
proceeding
with these ad-
justments.
Connect a
signai
generator
to
both Hl-LEVEL
inputs
and two V.T.V.M.
to both
CATHODE
FOLLOWER
out-
puts.
Record
a 4O0
cls signal in
stereo A-test, with both
playback
volume
controls to max. at 7tlz i.p.s. Adjust
the record levels
by the record
gain
controls
until
the output
levels
are
1.5 V. Depress
the
push-buttons
lV and V
(stereo
B-test) and
adjust
the
record current
by
R115
(CHl)
and
R116
(CH2)
until the readings
on
the output meters
are 1.5 V.
Adjust
R 137
(CHl)
and
R
138
(CH2)
until the elec-
tronic
beam indicators
are
closing.
Release the
push-
buttons lV
and V
(stereo
A-test)
and
check
that the
readings
still are 1.5 V on
the output
meters.
6.0 Head alignment
without Tandberg
Test Tapes.
6.1 The
playback
head.
6.1.1 Height
alignnnent:
The
height
of the
playback
head is
aligned by the
height adjustment
screws. The upper edge
of
the tape
shall
run flush with
the
upper
part
of the airgap
for
channel
1.
6.1.2 Azimuth
alignmenl:
Play
back a standard
azimuth
alignment tape with a
V.T.V.M.
connected to
each cathode follower
output.
Adjust the
position
of
the
playback
head by the
azimuth
adjustment
screw,
until
maximum
reading is
obtained on the output
meters.
6.1.3 Lateral
alignment:
Pull
the
pressure
pad
(59.5)
away from the
erase head
when
the
standard azimuth alignment
tape is
being
played
back. The
output
level
should not
decrease
more
than 3 dB. Adjust
the
lateral
position
of
the
playback
head, if
necessary,
by turning
the head
mounting
plate.
All
the
alignments
specified
in chapters
3.1, 3.2, 3.3,
6.2
The
record
bead.
and
3'4 are valid for
model 62x with
the exception-o1
iorro*'in"l
instructions
given
under
para3.z.
paragraph
3.1.2 which
is
superseeded by 6.1.1
and
paragraph
3.2.3 is
superseeded by 6.6.2.
6.3
The
bias head.
4.0
control
and adiustment
ol
playback
amplifiers,
Follow
the instructions
given
under
para
3'3'
with
Tandberg
test tapes.
6.4 The erase
head.
4.1
Control of
the
playback
amplifier:
6.4.1 Height
alignment:
Play
back the test
tape No.
3.
This
is
a full track
pre-
The
height
of the erase
head is
aligned by
the height
recorded
tape with the
following frequencies:250-
adjustment
screws. Approx.0.25
mm
(.01
")
of the
'1
/z
.B.
all
WO
me
ed
ihe
:he
nd
2.0
rd-
uIs
ut-
)th
ust
ntil
,ns
ent
lgs
ec-
sh-
the
ferrite
core
for the upper track
of
the erase
head
should
be
visible above the tape.
6.4.2 Azimuth
alignment:
Align
the azimuth
position
of the
erase
head by the
azimuth adjustment
screw.
The erase head
should
be
parallel
with
the mounting
plate
for the heads
(15.4).
The azimuth
position
of
the
erase
head is not
critical.
6.4.3 Lateral alignment:
Turn
the
head mounting
plate
forthe
erase
head, until
the front
of the head is
parallel
to
the
pressure pad.
6.5 Track control, model
64x.
6.5.1 The record head:
Record a 1000
c/s
from a
generator
at maximum re-
cording level in
stereo A-test on track 1 and 3
(push-
buttons
l,
ll and lll
depressed)
for
approx. 5 seconds.
Turn
the tape
around and
make a similar recording
on
track
4
and 2. Cut the tape and
dip
it in
a
mixture
of iron
powder
and alcohol
(Magne-See)
to
make
the
recording visible. The
spaces
between the
recorded
tracks
should be distributed
equidistant
across the
tape. Readjust
the
height
position,
if
necessary, and
recheck the azimuth alignment.
6.5.2 The erase
head:
Insert a full-track
pre-recorded
tape
and
record a
1000
c/s signal from
a
generator
at maximum record-
ing level in mono
A-test on
track
3
(push-buttons
ll
and
lll
depressed). Cut the tape
and
dip it in the
Magne-See
solution. Check that the
re-recorded
track
is in the center
of the erased area. Adjust the
vertical
pos.
of the
erase
head
if
necessary.
6.5.3 The
playback
head:
Record a 1000
c/s signal
on track
1
(CH1)
and a 500
c/s
signal on track 3
(CH2)
at maximum recording
levels. Turn the tape
around and
play
back
track
2
(push-buttons
lll and V depressed) at
maximum
vo-
lume.
No
signal should
be
heard. Raise the
playback
head if the
1000 c/s signal is heard. Lower the
play-
back head if the
500 c/s
signal
is heard.
Re-check
the
azimuth
position.
6.6
Track
control,
model
62x.
6.6.1
The
erase head:
The height
of
the erase
head
is
aligned by the height
adjustment
screws.
The
tape
shall
run equidistant
from the upper
and
the lower
edge of the
ferrite core.
6.6.2
The
record
head:
The height
of
the record head is aligned by
the
height
adjustment
screws.
Record
a
1000
c/s signal
in
stereo
(push-buttons
l, ll
and
lll
depressed) at maximum
recording level
on a
full-track
pre-recorded
tape. Dip
the tape in the Magne-See
solution
and
check
that
the tracks
are distributed
symmetrically
across the
tape, and that
the recorded
zone
remains
in the
center
of
the
erased
zone. Readjust
the erase
and
the record heads, if necessary.
6.6.3
The
playback
head:
The height
of the
playback
head is
aligned by
the
height
adjustment screws. The
tape
shall
run
flush
with
the upper edge of the lamination
for
channel 1.
Readjust
the azimuth in
necessary.
7.0 Adiustments
of
the amplifiers,
vuithout Tandberg
Test
Tapes.
A V.T.V.M.
is connected
to each output terminal. The
signal
generator
is connected to the high level
inputs
of both channels and
tuned
to 400 c/s.
The
tape recorder is
set
up
for
stereo
recording
A-test
(push-buttons
l.
ll,
and
lll
depressed
with
the
operat-
ing
lever in normal fonvard
drive
position)
at 7tlz
i.p.s.
tape
speed. Insert
a
good quality
recording
tape.
Adjust the
recording
gain
controls
until
the
readings
on
the
output
meters are 1.5V with
the
playback
controls
to
maximum.
Replace the V.T.V.M.
for channel 1 with a distortion
meter and depress the
push-button
lV
(B-test
CH1).
Adjust
the recording
current
by R
115 until
the read-
ing
shows
3
o/o
distortion.
Replace
the
V.T.V.M.
for channel 2
with the
distortion
meter
and depress the
push-button
V
(B-test
CH2).
Adjust
the recorder current by R 116
until
the read-
ing
shows
3
o/o
distortion.
Adjust
R 137
(CH1)
and R 138
(CH2)
until the electro-
nic beam
indicators are closing.
Connect a V.T.V.M. to
each
output terminal and
pro-
ceed the recording as described
above
in
stereo B-
test
with all
push-buttons
depressed.
Adjust the R
233
(CH1)
and R 234
(CH2)
until the
reading on
the output
meters
are 1.5V. Make
sure
that
the
playback
volume
controls are
set
to max.
Release the
push-buttons
lV
and
V
(stereo
A-test)
and check
that
the reading
on
the
output meters still
are 1.5 V.
8.0 Control of total frequency
response.
The tape
recorder is set up for
stereo
recording B-test
(all
push-buttons
depressed) at7llz
i.p.s. tape
speed,
and with
a
good quality
recording
tape
inserted.
(Scotch
150
which
should be
run
5-10 times be-
fore
use to
have
the tape
surface
polished.)
A V.T.V.M. is
connected
to
each output
terminal. The
signal
generator
is connected to the Hl-level inputs
of
both channels. Tune the
generator
to 400 c/s and
set the
output
level from
the
generator
30 dB
below
maximum
recording
level. The readings on the
output
meters are the
0
dB reference
points.
Check
the frequency
response
for all speeds according
to
the
specification. Ref. fig. 7.
7t/zi.p.s.:
20-25 000 c/s
(-.t-
2
dB
30-20
000 c/s)
33L
i.p.s.: 20-18 000 c/s
(-+Z
aA 30-15
000 c/s)
17la
i.p.s.:
30-12
000 c/s
(-+Z
Og 40-
I000 c/s)
The
dilference
in
level
between
the two channels
should
be
less than 3
dB
at
any
frequency.
Increase the bias slightly
if
the treble response is too
high. Adjust R
609
(CH1)
and R
612
(CH2)
forTt/zi.p.s.
and
33L
i.p.s.
Adjust R
607
(CH1)
and
R
610
(CH2)
for
77la
i.p.s
until
correct frequency response
is
obtained.
8.1 Control of
playback
and
record
amplifiers.
lf
the frequency
response
does
not
stand up to
the
the
tpe
for
1a
)ut.
the
tis
nd
ing
lse
the
nd
lht
lhe
lor
channel 1.
rcul
Tandberg
rterminal. The
3h
level
inputs
rcording A-test
ith
the
operat-
on) at 7tlu
i.p.s.
ding tape.
il the readings
the
playback
ith a distortion
/
(B-test
CHl).
until the read-
h
the
distortion
/
(B-test
CH2).
until
the
read-
ntil
the electro-
rminal
and
pro-
tve in
stereo B-
(CH2)
until
the
.5 V.
Make
sure
are set to
max.
(stereo
A-test)
rtput meters
still
)n8e.
recording
B-test
,p.s.
tape
speed,
I
tape
inserted.
5-10
times
be-
ished.)
rut
terminal.
The
r
Hl-level
inputs
r to
400 c/s
and
Inerator
30
dB
readings
on the
e
points.
Check
ds according
to
20
000 c/s)
15
000 c/s)
9 000
c/s)
r two
channels
ency.
response is too
iH2)
for
7t/zi.p.s.
or 7?e i.p.s
until
ed.
amplifiers.
stand up to the
tolerances
given
above, one
should check
the
play-
back
and
record
amplifiers.
8.1.1
The
playback
amplifier:
Insert
a
100
ohm resistor
in
series with
the
playback
head for
the upper
track
(CH1)
to
ground
(red
wire).
Connect
a signal
generator
across the resistor.
De-
press
the
push-button
lV
(monaural
plaback
CH1)
and
set the
operating
lever
to normal
forward
drive with
the
playback
volume
control to
maximum.
The
signal
generator
is
tuned
to
400 c/s with
an
output level
of
2
mV. The
reading
on the
output
meter is
the
0 dB
reference
point,
at 7tlz i.p.s. tape
speed.
Check the
frequency
response
according to
fig.
6.
Repeat
the measurements
for the lower
track
(CH2).
The
oulput
tolerance
is
-+2
dB
for
all
frequencies.
The
difference
in level
between
the two
channels
should
be maximum
3 dB at
any frequency.
8.'1.2 The
record
amplifier.
Insert a
1000
ohm
resistor in
series
with the
record
head for
upper
track
(CHl)
to
ground
(black
wire).
Connect
a V.T.V.M.
across the
resistor. The
signal
generator
is
connected to
the Hl-level
input
of
CH1.
Depress
the
push-button
|
(monaural
recording
CH1)
and
set the
operating
lever
to
normal forward
drive.
Tune the
signal
generator
to 400
c/s
and
set
the
output
from
the
generator
30 dB below
maximum
recording
level.
The reading
on the
output
meter is
the
0 dB reference
point.
Check
the frequency
res-
ponse
according
to
lig.
5.
Repeat
the
measurements
for
the
lower
track
(CH2).
The
output tblerance
is
-+2
dB
for
all frequencies.
The
ditference
in level
between the
two
channels
should
be less than
3 dB
at
any trequency.
9.0 Adjustment
ol the FM-muttiptex
titter.
Feed
a 19 000
c/s
signal to
both FM-MX inputs
and
depress the
push-buttons
I and ll.
Set the
S-on-S
switch to
A-B test
and the
playback
volume
controls
to
maximum.
The recording
gain
controls
should be
set
to
maximum
recording level.
Connect
a V.T.V.M.
to
each
cathode
follower
output.
Adjust the
core
of
L4
(CH1)
and L5
(CH2)
for minimum
reading
on
the
output
meters.
10.0
Adiustment
ot the microswitches.
The
bias is
reduced
in
17e i.p.s.
tape
speed
to
obtain
correct
frequency
response.
The microswitches
(Ret.
fig. 2
and 4) is
introduced
in the
bias
regulating
circuits
and
activate
the
potentiometers
R
607
(CH1)
and R
610
(CH2)
in
17/e
i.p.s.
tape
speed
onty.
The
microswitches
are
located
at the
rear
of the recor-
der, ref.
fig.
4.
Set the
speed
selector
to 17e
i.p.s.
and loosen
the
two
screws holding
the microswitch
bracket. More
the bracket
slowly towards
the
activating
arm until
the
switches
operate
and tighten
the
two
screws.
Check the.
adjustment
by moving
the speed
selector
knob
slowly
lrom
17/e
to 33/+ i.p.s.
and back.
The
switches
shall now
operate
properly.
RECORD
HEAD
FIXING
SCREW FOR
HORIZONTAL
AOJ.
PLAY
BACK
HEAD
ERASE
HEAD
Fig. 1.
The
tape
path,
with
location
of the
bias head.
HEIGH T ADJ.
SCREW
| ,!oi5 |
\
MICROPHONE
/
\/
Mlc.1
ITE-con-o+vT
HIGX TEVEL
IN PI,JT
UPPER TRACX
!
(rrFT
cH)
i
BOARO
*
N0.5010
RlOT
18,1
O,1M
125V
r*
Rlo5
2t(
ltY
't25V
ulE
Rl12
2t
UPPER
R115
0,1M
R10:
't0
K
ECC 83/124'
(7025)
c101
Rlll
25, 2t(
I
R101
5,1 M
cr05
4@0
LOV{
LEVELI
HIGH LEVEL
IN
PI.JT
LOIVER TRACX
(RIGHT
CH)
row tEtEt
ECCsy|2AxT
(7@s)
Rn5
0,ly
l--n-rva.:iiF----EcE6'3^-2AiAo0-2t-l
;
"PifR
'*'{-Jn-rr-EF
I No 5006
R?0?
|
1c,2
oltr
I
'tt/c
i.gs.
atl
1
lti-p.s.
EOIIaLIZATION
SWITCH Nq50l6
a@0anAu1
R2
IM
5rK
R 24r
6BX
R 212
e8(
R
238
S3/t
Rl38
o5M
To.SorS" SwlTcH
(DEC1fi
CoNT.',t)
PLA YBAC
K
HEAD
TYPE
]7H
7h l'/t
ios.
EOUALIZATION
SWIEH
NO.5Ol5
IT
3T
tr
t?
n
t
/3 ip.s
+
3lt
JIJUERSIOE
TOP
(DEC
,5
on S:SWICH
lN P06B
ffiiliut"T'-
x
R
206
tnK
1W
cn0
O,0/27
c1(c4) 25
I{ATIVE INPUTS
CENTER
CHANNET
NOTES:
RE5IsIORs INDICATED
IN OHMS
x=1000oHMs.
|4
=
1.000.000 0HMS.
*
-
DEPOSITE0 CARBON
RESIST0RS.
RES|STORS
t1O
z UNLESS
OTHERwIsE SPEC|FIED.
3o4=coNf€cTloN
PoINTS
CAPACITORS I
NOICA]ED
IN
MCRd'IICROFARAOS
UN LESS OTHER\TVISE SPECI
FI ED,
capAclroRs
I
zo
Z
uNLEss
otneRwrSE sPEcrFrEo
ALL SWIICHES IN NETJTRAL
POsITION.
ALL VOLTAGES MEASUREO AT
LINE VOLTAGE 1IO VOLTS.
RESISTANCE
lN
ERASE
HEAD:
co.
90 oHMS.
RESIS]ANCE lN
RECORD HEAo:
co.300
0HM5,
RESISTANCE lN
PLAaACX
HEAD, co.250 oHMS.
RESsTANCE lN L2 AND L3 co. 20 OHMS.
RESETANCE lN L4 Al{0 l-5 co.
80
ofiMs.
=---------)
34
R€C.AXPI
12
ctr
REC
AMP
2
(]
A-TEST
I
A.T6T2
DIN-CONNECTOR
RADIO
c0 Nr. l
RESP. 4.
WII}I
FM
STEREO
FIIIERS,
BOIH
INPUTS HIGH LEIEL.
.;ff,{-
.iY'"qq!'!"
1
:l::l
!t'*.,61a,
!il€R ERAS
HE
o
-
UFER ERAS
HEAO
-
35-
35-
UftR
AIAS
HEAO
32
towER
B|AS HEAo
3t
-'l
I
I
I
I
I
,tl
R 30(R31)39X
R
34(R35)
&X
.f...,.
OSCILLAToR
80ARD
T-86/
No 65sg
c612
T
601
0)r
ffi
IMK
':;Y
-'t
I
I
I
I
I
I
23l
FGTE bTE
srART,/sroP
swncH.
(our510E
v
ler/
)
nll
Rl4
4X
3Jt
l.zx 3W
rD
tO.5375
lq5
r
'l
R
c 60{
50-750
i-
srYrTcH
{q5016
-:'--J
R 2{1
tEx
lw
R2\2
6.01(
'tw
n233
IM
I
[;":
-
| |
r0o0=rrr?
|
,,
|...........U_l
;f-Eril=-;;-^'.'*
vti
INqCAToR
#"
"^ffil"
-'l
?l ?i
ra ta
t9
r??
1k
-3lt
|
/.
'G...
ilrcRo
u
SWITCH
r1
ad
r.
l!10
l6Lut
.zf\u'
/ilb I
\v"
i€
luc
DIF
r,ro.2353
311
^/^
607
os"
R606
20x
c40r
R101
0,0lrr
0,15M
'l-owER
ERAS€
I
ucx
HSAD
IF
WP€ 4IH
rrcR0
AU10MAil
C
EAM
O6
RIGHT
!9L
--- ------J
PAPST SYI{CHRO}6US
XOIG
r-62 32
itr4-440
250v
OR:
ENGEr
SYllo.lRoxol5
rmToR
ES
5030/45
250V
MOIOR
swrTcH
vlt
AC50or
60qA
tMNSf
ro.2?3.
C?,
Cgqnd
Cll
inlh.
som.con
C5-C6ond
Cl?
-"-
TO
HIGH
LEVEI
I
NPUT
CH 2
34
REC. AXP
1
cll
l'\
=rJ
.,50N
S SWITCH
TOP(DEX
1
)
,Sors
PCGInON
H
ilEI
llEI
IFI
)t
\'1
qP
{lrMrEftoo(
H
HHH,"",
CA]HODE
I
FOLTOWER
2
PLAYB.
AMP
I
(B-15T)
2
st5r0R5,
,lriER$/rSE
SPECIFIE0.
ilcnoMrcRoF^R
DS
RED,
IS
OTHERWISE
SPECIFIEO,
PC6rnOil.
'AI
,EA0r co.
90 OHYS.
HEAo:
co.300
oHMS
H€AD:
co.250
0HM5.
!3
co.
20 oHMS.
L5
co
E0 oHMS
REC
AMP 2
43
A.TEsT
1
A-r
Esr2
rrf-_
o
E frYtzsto"
g
El4*-
ipARE
lt
14
-'"
LOWER
TRAC(
STOP
UPPER.TRACX
REC 2
SIART
PrAYE.l
PUSH SJTTON
SWIrcH
NO.6615
toffRJ.lacx,r"]8?ttE["Ju
SoNS"SWITCH
NOn004-l
TO HIGH
LEYEL
INPW
CH?
TAND*RG
IAPE
RECORD€R
M@EI 64T
DRAWING
N0.6637.
oxl
196€
ToP(oECX
2)
UPPER
TRACX
REC 1
-INE
ilFo
iOHFAFSNFOR
ENGEL
MoToR I MOTOR
5oc^
5?49
575o
IOWER
EFAS
HEAO
UFEi
ER^*
HE
9
UffiR
AIAS
HEAD
32
LWER
AIAS
HEAD
3t
Fig.
2. Tandberg
Tape
Recorder
Model
64x
-
62x,
Schematic'
I t
R,o
I f
crs
I \ fi;t]
-:
{--t,-_-l [--.C---l ai +
*';-f---l
I
L___j_____J
flcars.\
h
a
f1__--@1\l/
'%
.4-lT1
[Jl
va
0
l,'o'0,lll
| | ll Jcs,rr)
h
L-g ll
1,,,,1 ll AV
q
onrrHSf
\7
'o
c6lrlil
lEllEl Xr
.f]E+
(.'(
)H
?*-
*u-
V
{-rs,:}
\--Y
t-;E;_
.__..-PT
-
r-\_
/'^.
-6li-_\/
-
'--r6i'-
({{a'
H!
{@|:l
.lR
-6F
#
ql
+R6#r
-L-!-q.sr-f
{-}
>()
o
E-,+
@
ot61
coo!-35
X{%J
H /A
l,;-1
|,;*'f
o
\9 )
-\7-
hG7- 3r
\=_.,,
[ \.\
L0
\e\
0
0
33
l
/n
c6o3
t'
)
Fig.
3.
The
oscillator
board, component
lay out.
Fig. 4. Location
of the
microswitch
for the
bias
circuit.
&Ht$rodsrNd@&
Fig. 6. The
response
curves for the
playback
ampli-
fiers.
$ ro
4
@
r&
& s tm M
Fig. 7. Total
frequency
response
curves.
Fig.
5. The response
curves
for the record
amplifiers.
,fft $ t6 & d r@ &
90
r@
fl@
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
TANDBERG 62 series is a professional tape recorder that combines high-quality audio with advanced features and exceptional versatility, making it suitable for a wide range of applications. With its improved head alignments and electrical adjustments, the TANDBERG 62 series delivers enhanced frequency response and signal-to-noise ratio.
This device incorporates a separate bias head to improve frequency response and signal-to-noise ratio, and a fully transistorized oscillator for increased reliability and stability. The equalization circuits have been refined to optimize the recording and playback process, ensuring accurate reproduction of audio signals. Additionally, a microswitch in the bias circuit automatically reduces bias in 1 7/8 ips tape speed, optimizing performance for different tape speeds.
Ask a question and I''ll find the answer in the document
Finding information in a document is now easier with AI
Related papers
Other documents
-
CONNECTA HEF717 Operating instructions
-
Ancona AN0113-2802B User manual
-
ABB Magne 3 User guide
-
Sansui 1000X User manual
-
OTARI MX-5050 MKIV-2 Operation and Maintenance Manual
-
Shimano BR-TS10 Exploded View
-
Aiwa HV-FX780 User manual
-
-
Tascam Ministudio Porta One User manual
-
