Fuji Electric P-61 User manual
.I
INSTRUCTION
MANUAL
for
Electronic
Watch
Testing
Machine
TIMEGRAPHER
MODEL
P-61
Instruction
Manual
For
Timegrapher
Model
P-61
2jh!
F
:.
s
:.,
S
~
~
Index
Page
1m
porta
nt
Features
-------------
------
--------
---
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-----
---
------
--
---
-----
---
Principle
and
Construction
-------
---
---
------
---------
--------------
------------
2
How
to
Operate
---------
--
---
--
------
--
---
----------
-------
--
------------
-
-------
3
Preparation
---
----
-
--
--------
----------
-------
-------
-
---
--
---
-----------
- 3
Starting
&
Stopping
-----------
-
----------------------:·------------------
3
Microphone
---
-
----------------------------------
-
----------------------
__
4
Use of
Earphone
---------------------------------------------------------
5
Ink Roller -
----
-
------------------------------
-
-----------------------------
5
Oiling
---------------------------------------------------------------------
5
Recordings
--
--
-
---
----_; _---
--------
------
---
-----
-
--------
--
---------------
---
---
6
Princi
pie
of
Recording
-----
-
-------
--
----
--
------
--
---
---
--------
--
------
6
Number
of
Beats
of
Watches
and
Clocks
-------
-
----
---------------
6
Recording
and
Volume
Adjusting---
---
----
--
-------
-
-----
--
-----
--
-----
7
Adjustment
of
Striking
Sound
-
---
--
--
--
--
--
----
---
---
-
-------
--
-
-------
7
Reading
of
Measure
Plate
and
Graph-paper
------------------------
8
Instant
Reading
by
Graph-paper-
---
--------------------
----
---
---
----
- 8
How
to
Find
Defective
Parts
in
Watches
----
--------------
-------
-
----------
9
Trouble
Shooting--_-----
_--
__
------------
---------
-----------------
----
__
---------
14
Name
of
Parts
----------------
--
--------
-
------
---------
---
----
-----
----
--
------17
Appendix
Parts
List
Circuit
Diagram
TIMEGRAPHER MODEL P-61
IMPORTANT
FEATURES
:
1.
Extra
small
and
lightweight:
Made
light
for
portability.
Occupies
little
space,
and
is
easy
to
carry.
2.
High
efficiency
:
Further
technical
improvements
have
been
made
due
to
our
long
experience
and
continuing
research.
3.
Carrying
case
unnecessary
:
The
machine
case
is
also
a
carrying
case
.
4.
Stand
microphone
:
By
changing
the
position
of
the
milk,
it
is
possible
to
change
the
position
of
the
watch
being
tested.
5.
Easy
operation
:
Starting
has
been
further
simplified.
Operation
is so
easy
that
even
a
layman
can
use
it
.
- 1 - ·
PRINCIPLE
AND
CONSTRUCTION
The
use
of
a
highly
efficient
quartz
crystal
ploys
on
important
role
in the "
TJME
-
GRAPHER" . The
exacting
signal
standard
obtained
from
use
of
the crystal,
is
compared
with
the ticks
of
the
watch
and
the result
is
recorded
. Thus
on
accurate
test
of
the w
at
ch
IS possible.
The
frequency
of
the crystal
is
5,280
cycles (5,280
vibrations
per
second),
and
th
is
frequency
is
reduced
to
60
cycles to
synchronize
with
the
moto
r. The
motor
turns the
spiral
roller
(
wtth
2
projections
)
at
a speed
of
15
rev.
or
16
.5
rev
.
per
second (
change
being
mode
by the crystal selector switch).
The tick
of
the
watch
acti
vates the
printing
bar
,
and
records the
difference
as com-
pared
with
the
frequenc
y
standard
time by
striking
the
projection
of
the spiral
rol
ler, as
in the
illustration
below
.
Synchronous
Motor
DIAGRAM OF MACHINE
Principles
and
Constructions
Watch
Risings
of
Spira
l
Rollar
Spiral
Roller
~
Printing
c:==:=UB
ar
- 2 -
HOW
TO OPERATE
I
Preparation
:
1.
Remove
the
cover
of
unit
ond
check
whether
all
tubes
ore
installed
properly
in
sockets
.
2.
Plug
power
cord
( 0 )
into
electric
outlet.
3. Plug
microphone
cord
( f)
into
jack ( L)
and
the
other
end
into
jock ( a )
on
Stand
Microphone
( P
).
4. Plug
earphone
cord
( e)
into
jock ( M) .
5.
After
cutting
end
of
recording
paper
( S)
to
a V
shape
,
place
on
paper
stand
(Q
).
Insert
under
spiral
( X
),
between
feed
plates
,
and
under
paper
holding
plate
( V
).
Be
sure
that
paper
feed
lever
(T)
is
lifted.
6. Push
down
button
(J)
of
crystal
switch
to
match
the
correct
number
of
beats
of
the
type
of
watch
to
be
tested.
N.B.
Voltage
change
plug (i) :
There
ore
five
types
of
voltage that
this
machine
con
be
adjusted
to
by
just
changing
the
plug
( i) .
It
will
be
usually
plugged
into
the
correct
y
our
use
at
the
factory.
The
voltages
and
ranges
ore
as
follows
:
Voltages
Applicable
Range
of
Voltage
115 v 110
125 v 120
200 v 200
225 v 210
250 v 240
H Storting &
Stopping
:
A.
Starting
1. Press
the
Starting
Button ( H)
of
AC Switch
..
and
pilot-lamp
( K) will
light
up.
In
about
20-30
seconds
the
vocu
.um
tubes
will
worm
up.
Spin
the
handle
( U)
of
spiral
roller
( X)
towards
the
arrow
mark
g
entl
y
and
swiftly
as
if
spinning
a
top
,
and
the
motor
will
start
running
.
2.
When
the
Paper
Feed
Lever ( T)
is
pushed
bock-
words
and
downwards
,
the
recording
paper
( S) will
st
art
feeding
forward
.
- 3 -
115 v
130 v
210 v
230 v
250 V·
voltage
for
3.
Gradually
turn the
volume
co
ntrol
knob
(H) clockwise,
and
the ticks
will
be
heard
,
and
a series
of
dots
will
appear
on the
recording
paper
.
B.
Stopping
1.
Pull Paper Feed Lever (T)
up
and
the
paper
will
stop
feeding
.
2. Return
volume
knob
( H) to "
DEC
'
and
push switch
button
down
to switch off.
N.B.
1. Recording should be
made
after
adjusting
volume
knob
(H)
at
optimum
recording
position.
2. If there
is
a
power
stoppage
or
sudden
change
in v
oltage
, be sure
that
the
button
(H)
is
returned to "
DEC
" position.
Ull
Microphone
:
There
are
generally
six
different
watch
positions, i.e.
dial
up,
dial
down
,
crown
up,
crown
down
, 1
2-up
and
1
2-down.
Micro
phone should be used
at
every
position
f
or
proper
testing.
1.
Holding
watch
:
Pull
handle
(c) in
figure
and
clamp
watch
between
holding
plate
( b)
and
press
firmly on
oscillating
plate
( d)
as
the "tick "
of
the
watch
is
obtained
from
this
plate.
b c
2.
Change
of position :
Watch
can be tested
1n
six
different
position if
tilted
and
placed
as
in
illustra-
tion,
howe
ver,
for
the last position
it
will
be necessary
to
turn the watch
around
(due to the connecting
cord
of
the ·mike
).
3. Pick-up
microphone
:
A
hand
y
midget
microphone
is av
ailable
for
testing
w
all
clo
ck
s
and
ala
rm clocks, etc. Just
by
clipping
on to any
part
of
the clock
it
is
possible
to
pick
up
the "ticks" This will be supplied
at
extra-cost
.
- 4 -
IV
Use
of
Earphone :
When
using
earphone
, lift
up
ba
r
of
paper
feed
,
and
stop
the
printing
sound.
and
it
is
easy
to
hear.
Turn
knob
(H)
to
right
and
the
tick
becomes
louder.
By
using
the
earphone
,
the
following
can
be
detected
:
( 1)
touching
sounds
of
hair
spnngs
.
( 2)
unnatural
sound
caused
by
damaged
balance
staff
and
jewel
hole.
( 3)
irregular
so
und
caused
by
improper
meshing
of
gears
of
the
pallet
fo
rk
&
staff
.
( 4)
when
the
balance
with
hairspring
touches
other
parts
and
creates
sounds
.
( 5)
touching
sounds
of
pallet
fork &
staff
and
roller
table.
As
above
, by
using
the
earphone
one
con
find
cause
of
trouble
which
were
never
before
recognized,
such
as
defects
detected
in
the
process
of
changing
the
p
os
ition
of
the
watch
,
which
are
not
re
c
orded
on
the
tape
.
Y Ink
Roller:
Non-drying
ink
has
been
us
ed
which
has
, by a
special
method
,
impregnated
deepl
y
into
the
sponge
-like
roller
( W
),
so
that
it will
withstand
long
use.
However
,
if
it s
hould
become
nece
s
sar
y,
apply
a small
amount
of
the
spore
ink
over
the
ro ller with
a
brush
( j
).
Stop
roller
when
inking
and
use
ink
sparingly
.
New
rollers
ma
y
be
obtained
from
us.
Do
not
use
stamp
pad
ink,
as
it
dries
quickly
and
fills
pore
s
and
hardens
the
rubber
roller
.
'
~
Oiling
First
rem
ove
Grid
cov
er
( g)
A s
mall
amount
of
clock
spsing
oil,
or
the
like,
should
be
added
to
the
point
s
s
hown
by
the
arrow
marks
bel
ow
about
once
a
month
(
if
necessar
y,
more
frequent-
l
y).
N.B.
If
dirt
gets
into o iling
points
,
the
machine
ma
y
become
i
naccurate
,
so
c
ar
e s
hould
be
tak
en to k
eep
the
se p
oint
s c
lean.
- 5 -
( A)
( B)
( C)
( D)
(
E)
(F
)
( G )
( H)
( I )
(
J)
( K)
( L)
(M)
( N)
( 0 )
( p)
( Q)
( R)
(s )
(
T)
( U)
( V)
(W)
(X)
( y )
(z)
NAME
OF
PARTS
Quartz
Cystal
Tubes
12AU7
II
1
2AU7
II
6BM8
II
2021
II
1
2AU7
II
12AX7
Push
Button switch
for
Power
Source & Volume
Knocking Intensity Adjusting Knob
Crystal
Changing
Push
Button
Pilot Lamp
Microphone
Jack
Receiver Jack
Measure-Plate
Plug Power
Cord
Microphone
Paper Stand
Shaft
Paper
Paper Lever
Handle
Paper
Holding
Plate
Ink Roller
Spiral Roller
Voltage
Changing
Jack
Fuse
d b c
e
a
y 0 z
Mi
H N
( a ) Stand
Microphone
Jack
( b )
Holding
Plate
( c )
Mike
Handle
( d )
Oscillating
Plate
( e ) Earphone
( f )
Mikrophone
Cord
( g )
Grid
Cover
( h ) Paper Feed Roller
( i )
Voltage
Changing
Plug
( j ) Brush
-
17
-
RECORDINGS
I Principle
of
Recording
The
recording
paper
IS
fed
by
a
paper
feed
roller
(h)
under
the
spiral
roller
at
a fixed
speed
where
the
printing
bar
strikes
the
spiral roller.
When
the
watch
is
faster
than
the
fixed
speed
of
the
revolution of
the
roller,
the
recorded
line
ap·
pears
at
an
inclination
towards
the
right, which
means
that
there
is
a
"gain"
1n
time,
and
the
reverse
recording
shows
a
"lose"
of
time.
B_
Number
of
Beats
of
Watches Cod Clocks
Generally,
the
number
of
beats
of
watches
ore
5
beats
per
second,
but
some
models
now
hove
5.5
or
6
beats
per
second,
while
the
clocks
have
various
number
of
beats.
However,
most
watches
and
clocks
con
be
tested
by
the
Timegropher.
The
relationship
between
numbers
of
beats
and
recordings
ore
shown
below.
(
l)
Recording
appearing
in
one
line :
Per Hour
36,000
21,600
19,800
18,000
12,000
5,400
4,320
3,600
Number
of
Ticks
Per Second
10
6
5.5
5
3
1.5
1.2
1.0
(2)
Recordings
appearing
1n
two
lines:
Number
of
beats
per
hour
14,400,
Number
of
beats
per
sec. 4.
'
..
.'
...
+
'
.....
,......
(3)
For
watches
requiring a
change
of
signal
standard,
change
crystal switch to
19,800
beats.
Number
of
beats
per
hour
1
9,800,
Number
of
beats
per
sec.
5.5.
A
graph
to
the
left shows
the
recordings
in
which
a
watch
has
5.5
beats
per
second
but
when
cry-
stal
selector
switch
is
not
switched to
19,800
beats.
~
6
~
m Recording
and
Volume Adjusting
It
is
most
important
to
make
recordings
as
clear
as
possible
by
adjusting
the
volume.
Some
watches
show
quite
different
graph
lines
according
to
the
volume
of
sound
(graphical
examples
shown
below).
Test
watches
where
the
line
of
dots
shows
the
best
uniformity
as
per
the
following
figure
(c),
by
turning
the
volume
switch
(H)
from left
to
right
gradually.
N.
B.
Tick of
watch,
consists
of 3
sections.
One
of
these
three
sections
may
some-
times
be
recorded
irregularly
on
the
paper
when
the
setting
of
volume
switch
is
not
proper,
It
IS
most
important
to
always·
record
the
1st
sound
only,
and
to
make
it
print
clearly.
I & m
shows
sounds
coming
from
two
sections
of
the
watch,
as
indicated
by
the
arrows.
[~o
,,,1?.
0
lli
;;(
/$
J!'Z(
The
graph
(a)
shows
the
recordings
when
the
volume
knob
(H)
is
gradually
turned
towards
the
right
and
illus.
"c"
shows
the
best
recording
position.
(a) (b) (c)
j=--
f--
,
__
_
IV
Adjustment
of
Striking Sound :
If
the
striking
sound
is
weak,
a
clear
recording
cannot
be
made,
therefore,
the
striking
sound
knob
(1)
should
be
turned
to
the
right
to
obtain
the
proper
sound.
For
stop
watches,
etc.
which
have
a
fast
beat,
the
knob
should
be
turned
to
the
right
for
clear
recording.
-
7-
V Reading
of
Measure
Plate
(N)
and
Graph-paper
(S)
The
arrow
mark
on the square
table
indicates the
daily
rate
of
a
watch
(gain
or
loss
per
24
hours)
when blue lines
of
measure-plate
are
placed
parallel
with
the
recorded
lines on the
paper.
The
black
letters on measure-plate
indicate
the
gain
of
time
and
the red letters
indicate
the loss
of
time.
VI
Instant Reading by
Graph-paper
The
graph-paper
used in this tester can measure
gain
or
loss
without
using the
measure-plate.
That
is,
you
can measure
gain
or
loss
of
time
by
counting
the
number
of
columns on
which
the dots
are
printed.
(each
column
represents 10 seconds)
within
three sections
(three
sections which
are
separated
by
horizontal
lines, represent
24
hours).
See
the
following
examples.
(1)
No
gain
nor
loss. (2)
Loss
of
30
sec.
(3)
Gain
of
3 min. (4)
Loss
of
10
min.
(1)
(2)
(3)
(4)
~~~.
....
....
' '
-.;-------~-
--'-----
...
-;:::-
-~
.........
---------
i
-
8-
HOW
TO
FIND
DEFECTIVE
PARTS
IN
WATCHES
The following graphs show the condition of watches tested by the Timegrapher.
(5)
This
shows proper time keeping, neither gain nor loss.
(6)
Amplitude
(out
of
beat):
These two lines
of
graph show unbalanced swmg
of impulse
pin
which
will
disturb normal operation of watch
and
has to be
corrected.
(7) The space between two lines as per graph means a slight unbalanced swing
of
impulse pin, but
is
not
so·
serious.
This
may be observed
in
many ordinary
watches.
(5) (6)
II
:I
I~
I
I ,
.I
I,
I
(7)
. . I
__
]'
___
_
(8)
Unbalance of balance wheel :
Right graph has been recorded
at
crown-up posi-
tion
and
crowndown position.
When
in
crown-up position there
is
loss
of
2
min.
40
sec. and when
in
crown-down position gains
2
min.
Thus, you
will
see changes of isochronism
of the watch because
of
the unbalance
of
balance
wheel.
- 9
--
(8)
I
I
I,
(9)
"'-
~·
~·
-
..
;·.
(1
0)
-.,__
.
-:..
·~
.
·-.
( 9 ) This
recording
resulted
by
an
inadequate
oscillation
of
balance
wheel
(about
100°
of
oscillation).
This
watch
has
no
oil
and
weak
mam spring.
(1
0) This
is
also
as
above
•about
90°)
with
watch
at
12
o'clock
(11)
up
position
and
the
oil
is
sticky.
This
1s
an
old
watch
slightly
magnetized
and
the
graph
shows
that
escapement
is
faulty.
Escape-
(
11)
(13)
pivot
is
worn
out,
and
the teeth
of
escape wheel
are
uneven.
(1
2) Knockings :
(12)
.·:.·
...;:;
(14)
Balance wheel
IS
occasionally
knocking,
where
recorded
lines
are
always
printing
towards
rhe
right
side.
(1
3) As knockings become
frequent,
the
more
recordings
of
knockings
appear
on
the
paper,
decreasing
the
normal
recordings.
(14)
When
knockings become
very
frequent,
its
recordings
appear
to
be just iike
the
gain
of
time. In this case
you
can
hear
clearly
sounds
of
knockings
by
rece1ver.
-
10
~
(15)
(16)'
(18)
(15)
(16)
,-.,_
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__
II
Unevenness
of
escape wheel teeth:
One
of
the teeth
of
escape wheel
has a slight
defect
and
one
dot
appears
out
of
line.
(in
case
of
15 teeth 1n escape
wheel).
(17)
The
recordings
indicate
the
improper
meshing
of
escape wheel
teeth
with
pallet
jewel due to
unevenness
of
escape wheel teeth.
Unevenness
of
the
4th
wheel teeth:
This shows a sudden
change
of
(17)
(18)
1'--
oscillation
of
balance
wheel caused
by
touching
of
second
hand
with
crystal
once a
round,
and
also the same result
would
appear
by
unevenness
of
teeth
of
the 4th
wheel.
(19)
Condition
of
banking
prne:
This
watch
loses 10
sec.
per
24
hours
due
to
some defects in esscapement.
Impulse pin
is
not
touching
at
fixed
period
with
pallet
fork
due
to
maladjust-
ment
of
banking
pin
and
escapements.
-11-
(20),
(20)
(21)
(21),
(22)
Escapements
are
magnetized
:
These
are
recordings
shown
by
the
influence
of
magnetized
es-
capements.
Recorded
lines
are
apt
to
shaw
irregular
swelling
waves
which
are
similar
to
a re-
cording
of
an
indequate
oscilla
tion
of
balance
wheel.
In
such
case,
it
is
necessary
to
demag-
netize
them.
Scrapping
sound
of
hairspring
can
be
sometimes
heard
in
headphone.
(22)
(23)
---
i I
(24) (25)
:::1
...
-,
..
.....
"'
...
::
'
'
>.._
....
'.::.
(23)
This
shows
a
recording
of
watch
which
has
number
of
ticks
5.5
per
second
but
measured
without
placing
the
crystal
selector
switch
to
19,800
beats.
Consequently
it
shows
faulty
gain
of
time.
(24)
Tangling
of
hair
spring:
Tangling
of
hair
spring
shows
these
disordered
recordings.
It
can
be
heard
as
irregular
sounds
in
the
earphone.
(25)
Oiled
hairspring:
This
recording
resembles
a
slow
condition,
but
actually
indicates
much
gain
of time
due
to
oil
on
hairspring.
Rapid
ticks will
be
heard
in
earphone,
and
recordings
are
printed
always
towards
the
right
side.
-12-
(26)
(27)
,:
.
-·
•'
.....
---\"
~
13
-~-
(26)
Clock:
This
is
a
recording
of
an
alarm
clock which
has
4 ticks
per
second
and
recordings
appear
always
in
two
lines.
(27)
This
is
also
a
recording
of
on
alarm
clock, which
has,
however,
31;3 ticks
per
second
and
record-
ings
appear
in
one
line.
TROUBLE
SHOOTING
FOR
TIMEGRAPHER MODEL
P-61
In case there
happens
any
trouble
in
Timegrapher,
it
is
necessary
to
check first the
external
conditions
such
as
changes
in
voltage
or
neighbouring
machines which
generate
electric noises,
and
further
refer
to
the
paragraph
of
"How
to
Operate"
How
should it be
handled
about
troubles
which
come
from
Timegrapher
itself? This
booklet
presents the
explanations
for
its possible
troubles
and
gives guidances
to
one
who
experiences in
adjusting
and
repairing
radio
and
T.
V.
The
allowance
for
the
voltage
of
each station
of
electric
circuit
is
plus
or
minus 1
O%
of
the figures shown in the
circuit
diagram
attached
hereto
when
Timegrapher
is
working
in
order.
According
to
the
circuit
diagram,
the
voltage
of
each
station
checked
by
a tester
when
electric
circuit
is, considered,
not
working
in
order.
The
voltage
figures
in
the
diagram
are
measured
by
the
vacuum-tube
voltmeter
(hereinafter
referred
to
V.
T.
V.
M.)
Both
direct
current
(V)
and
alternating
current
('{)
shown 1n the
diagram
are
measured by
In
out
Resistance
Input
Capacity
(D.
C.
11
MD
Max.
1.6
PF.
V.
T.V.
M.
lA.
C.
MD
&
over
1.5
Max.
80
PF.
It
is
preferable
to
use
V. T. V.
M.
as
a
voltmeter
than
Circuit
Tester, because the
circuit
tester usually indicates
somewhat
lower
voltage
than
that
of
V.
T.
V.
M.
Troubles
in
Electrical
System
:
1.
Symptom
: Rectified
direct
current
is
not
working
in
order.
Check:
"!"he
bulb
(6
X
4)
or
power
transformer.
2.
Symptom
:
No
tick sound
of
the
watch
can be
heard
by
the receiver.
Check :
Microphone
may
not
be
working
due
to short
or
disconnection
of
wire
system.
Note:
A.
F.
Amp.
of
Timegrapher
has the same mechanical
composition
of
sound
amplifier
used
for
radio
and
T.
V.
3.
Symptom
: Ticking sounds
of
the
watch
is
normal
but
the
recordings
do
not
appear
Check:
on the
paper.
Relay
(2D21)
may
not
be
working.
The parts
which
serve
to
change
voltage
such
as
electromagnet,
resistor, condenser, etc. in
relay
(2021)
may
need
to
be
replaced.
In rare occasion, the mechanical
adjustment
is
required
in the
supporting
rubber
of
printing
bar.
-14-
Note:
The
machine
is
sensitive
to
the
external
noises such
as
electrical
disturbances
and
other
noises.
With
these
noises,
recording
sounds
do
not
correspond
with
fhe
tcking
of
the
watch.
Therefore,
make
sure
that
there
1s
no
electric
calculating
machine,
typewriter
or
any
noise
which
will
effect
directly
to
the
microphone
in
the
neighbourhood.
4.
Symptom
: The
recording
shows
a
considerable
gain
or
loss
and
irregularity
even
though
the
watch
itself
is
very
accurate.
In
case
of
the
above
troubles,
the
performance
of
X-tal
OSC
and
Buff, Divider,
Power
Amp.
and
Motor
(they
serve
to
keep
the
standard
of
time)
are
not
working
correctly.
The
causes
of
troubles
will
be
explained
in
the
following
paragraphs
:
A.
Causes
:
Crystal
vibrator
may
not
be
generating
its
signals.
Check
:
Examine
circuit
of
X-tal
OSC
and
Buff.
B.
Causes
:
Crystal
vibrator
is
working
correctly
but
the
frequency
of
Divider
A
is
not
reduced
to
the
amount
which
is
equal
to
l
/22
or
l
/20
(240
c/s
or
264
c/s)
Check
: 1
he
amount
of
resistance
and
capacity,
both
of
which
are
arranged
in
parallel
to
BT
-3X,
should
be
readjusted
within
the
limit
of
described
figures
in
the
diagram
in
order
to
obtain
the
frequency
of
240
c/s
or
264
c/s.
C.
Causes:
Divider
B
does
not
have
correct
frequency.
Check
:
The
amount
of
capacity
arranged
in
parallel
to
Bl-4X
should
be
readjusted
within
the
limit
of
described
figures
in
the
diagram
in
order
to
obtain
the
frequency
of
l
/4
(60
c/s
or
66
c/s)
Note:
When
the
troubles
cannot
be
eliminated
by
adjusting
capacity
and
resistance
within
the
limit
of
described
figures
in
the
diagram,
the
related
parts
in
Divider A
and
Divider
B,
and
Vacuum
tubes
(l2AU7,
6BM8)
should
be
examined.
Power
Ampifier
is
the
same
mechanical
composition
:
as
of
radio
and.
T.
V.
except
the
following
difference
In
Timegrapher
Load
IS
on
Motor.
In
Radio
and
T.
V.
.
Load
1s
on
Speaker.
Motor
Imp.
lKD
-15-
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Table of contents
Other Fuji Electric Test Equipment manuals
