Armstrong JUBILEE Mk 2 Manual
Specialists
in
High
Quality
Sound
Reproduction
for
over
25
years
JUBILEE
Mk
2
TUNER-
AMPLIFIER
CHASSIS
INSTALLATION
&
OPERATING
INSTRUCTIONS
AND
SERVICE
DATA
ARMSTRONG
WIRELESS
&
TELEVISION
CO.
LTD.,
WARLTERS
ROAD,
LONDON,
N.7.
NORth
3213
(SERVICE
DEPT.
Telephone:
NORth
6351)
0
0
0
Page
1
CONTENTS
.A
Installation
and
Operating
Instructions
Alignment
Instructions
......
...
...
...
Voltage
Table
...
...
...
...
...
Service
Notes
Components
Values
Table
...
...
...
...
...
Guarantee
.
......
Pages
..
2-5
.
.
6
-
8
8
11
12
Rear
Cover
SCHEMATIC
DIAGRAMS
Rear
Chassis
View
.
Diode
Probe
Circuit
.
Alignment
Layout
Valve
Bases
...
...
Drive
Cord
Assembly
.
Circuit
Diagram
and
Switch
Chart
Pacia
Board
Template
..
3
7
.
■
9
~
IQ
10
Pacing
12.
Rear
Page
•This
booklet
is
valuable
to
you
and
should
be
carefully'
kept
as
long
as
the
instrument
is
in
operation.
For
the
average
user
with
little'
or
no
knowledge
of
electronics
the
only
section
which
will
be
of
real
interest
is
that
dealing
with
installation
and
operation.
In
addition
the
removeable
template
will
be
useful
if
you
are
cutting
a
facia
panel
in
your
cabinet.
The
other
sections
of
the
booklet
are
designed
for.
the
Service
Engineer
or
the
more
knowledgeable
user
and
provide
all
the
information
likely
to
be
required
for
servicing
the
instrument.
INSTALLATION
AND
OPERATING
INSTRUCTIONS.
—
C
O
NNECTIONS
-
Mains
Supply
.
Each
model
is
fitted
with
approximately
9
feet
of
lead
for
connection
to
the
mains
supply.
Before
connecting
the
Chassis
the
voltage
selector
plug
on
the
top
of
the
mains
transformer
should
be
adjusted
to
the
correct
setting.
It
is
suitable
for
A.C.
supply
only?
40-60
cycles?
adjustable
between
200
and
250
volts.
AM
Aerial
.
A
separate
aerial
should
not
normally
be
necessary
for
good
reception
on
medium
and
long
waves
but
in
some
areas
under
Certain
conditions,
it
may
bring
about
an
improvement.
If
an
aerial
is
used
it
should
be
.connected
to
terminal
A
and
should
normally
bo
of
at
least
30
yards
in
length?
of
single
core
lead
and?
if
possible?
partly
outdoors,
iiyhen
a
separate
aorial
is
used
the
Ferrite
Rod
is
still
in
circuit
and
the
following
remarks
about
its
adjustment
apply.
Ferrite
Rod
.
Where
the
forrite
rod
and
the
metal
holding
brackot
have
been
Aorial
.
removed
to
ensure
safe
transit
they
should
be
replaced
as
follows.
Locate
the
bolt
which
projects
upwards
from
the
back
of
the
ganged
condenser
and
remove
the
nut
and
washers.
The
metal
.bracket
is
then
fixed
and
the
washers
and
nut
replaced?
one
washer
each
side
of
the
bracket.
This
bracket
allows
a
reasonable
adjustment
of
direction.
The
rod
should
be
adjusted
for
maximum
signal
strength
and
the
securing
nut
tightened
to
hold
it
in
this
fixed
position.
One
complication
with
this
type
of
aerial
is
that
it
is
sensitive
to
hum
pick-up
particularly
from
the
field
which
surrounds
the
mains
transformer.
In
isolated
cases
it
may
be
found
that
the
position
for
maximum
signal
coincides
with
the
position
where
hum
is
induced.
In
such
a
case
it
may
be
possible
T&b
move
the
rod
and
eliminate
the
hum
without
any
ap
p
r
e
c
i
a
b
l
e
loss
of
signal*.^:,
If
such
a
compromise
is
not
possible
wo
wouldou
to
i^iiK>
!
!isS^#
is
b|
,
acket
from
its
.
fixi^Aand
attach
it
in
an
Optimum
position
on
g'8L^r"‘"the
side
of
'
.the
cabinet.
A
-sufficient
length
of
lead
has
been
provided
for
this
purpose.
Another
consideration
when
adjusting’for
maximum
signal
is
that
if
the
long
waveband
is
unlikely
to
have
much
use
it
is
advisable
to
adjust
for
the
optimum
position
on
the
medium
waveband
only.
We
would
suggest
the
adjustment
being
made
with
the'
receiver
tuned
to
your
Regional
Home'
Service.
m
Aerial
.
•
The
aerial
fouder
should
be
of
70/80
ohms
co-axial
cable
and
should
be
connected
to
a
co-axial
plug
which
goes
to
the
co-axial
socket
marked
FK.AE.
FM
reception
is?
broadly
spoaking*.
subject
to
the
same
"’
conditions
as
television
in
that
in
selecting
an
aerial
local
.
conditions
are
thedetermining
factor.
Generally,
a
simple
horizontal
dipolo
in
the
loft
or
on
tho
roof
will
bo
moat
suitable
but
in
good
reception
areas
one
of
the
iJ^too^typos
will
usually'provo
adequate.
In
pp.or
reception
areas
a
high.
of
aerial
will
be
necessary.
"
*'
‘
1
*
1
The
arms
of
the
dipole
should
be
2-ft.
6-ins.
long
(5-ft
.
total
length)?
fixed
horizontally
and
should
normally
be
directed
broadside
towards
the
tr&nsnlittor.
It
is
a
good
idea
to
rotate
the
aerial
for
max
imum
signal.
-
Please
note
that
neither
a
separate
AM
aerial
nor
the
ferrite
rod
are
in
circuit
on
FM
and
a
separate
F.H.F.
aerial
must
bo
used.
Earth.
Tho
earth
lead
should
bo
connected
to
terminal
E.^
Although^
1
A
a
separate
earth
is
not
essential
on
this
type
of
chassis
it
may
reduce
electrical
interference
land
hum
if
the
mains
supply
or
circuit
is
bolow
standard.
Page
3
Tiagram
of
Connections
.
This
diagram,
shows
the
back
of
the
chassis
only*
The
F.M.
aerial
.
connection
is
on
top
of
the
chassis
and
has
already
been
described.
COMMON
0
0
0
3
OHM
tSOffM
AERIAL
EARTH
0
0
COMMON
0
0
0
ORAM
GUAM
TAPE
RECORD
TAPE
REPLAY
SPARE
POWER.
V*
—
(S
P£
»
The
chassis
is
suitable
for
use
with
most
permanent
magnet
,,
loudspeakers
and
the
connections
for
3
and
15'
ohms
loudspeakers
ciie
marked.
An
effective
impedance
of
7\
ohms
can
also
be
obtained
by
connecting
to
the
two
outside
terminals
and
ignoring
the
centre
terminal.
.
An
extension
speaker
may
be
fed
from
the
chassis
in
parallel
wj.th
the
mam
speaker
but
if
it
is
of
different
impedance
it
should
be
connected
to
the’pair
of
terminals
appropriate
to
its
value.
It
should
be
noted
that
if
two
loudspeakers
of
15
ohms
impedance
a;
o
connected
to
the
same
terminals
(i.e.
are
in
parallel)
then
their
e.
motive
impedance
with
both
speakers
in
circuit
is
74
ohms
and
they
should
Jkl
.
Jed
^
o
m
the
74
ohms
output.
Goamo^hone:
Two
pick-up
inputs
are
providod
and
these
are
suitable
for
most
«
crystal
pick-ups
at
present
available.
GRAM.1
.
Sensitivity
1000
mV..Impedance
1
Meg
ohm.
Suitable
for
Garrard
GC-8:
Garrard
GC-8
PA;
B.S.R.
Pul-fi;
Acos
types.
GRAM.S.
Sensitivity
280
mV.
Impedance
270
K.ohm.
Suitable
for
Collaro
studio
’0*
and
Studio
’P'.
To
connect
the
pick-up
to
the
Jubilee
chassis
screened
pick-up
lead
must
be
used.
This
consists
of
a
single
inner
core
insulated
from
an
ouuer
screen.
At
the
gramophone
unit
the
inner
lead
is
connected
to
one
side
P^
C
^
“
U
P
an<
i
the
screen
to
the
other
side
of
the
pick-up
and
to
earth.
At
the
chassis
the
screen
is
connected
to
the
centre
of
the
three
pick-up
terminals
and
the
inner
lead
to
one
of
the
other
two
terminals,
depending
or.
the
type
of
pick-up
used.
L-Q:'-
Output
Pick-ups
If
-
a
low
output
magnetic
pick-up
is
required
we
recommend
the
Goldring
580
cartridge
fitted
to
the
Goldring
Lenco
,
GL58
Transcription
Unit.
In
this
case
the
single
valve
booster
unit
(price
£2.16.Od)
must
be
vised.
The
pick-up
must
be
connected
vi
;
a
co—axial
lead
and
plug
to
the
co—axial
socket
provided
on
the
booster
ur.it•
^
This
unit
is
then
connected
to
the
GRAM.
2.
input
on
the
chassis
by
the
co-axial
.lead
provided.
The
power
lead
from
the
booster
unit
terminating
in
a
1-pin
plug
is
connected
to
the
4-pin
socket
on
the
rear
of
the
chassis.
This
socket
only
provides
sufficient
power
for
this
unit,
i.e.
HT.200V;
10mA:
T.'T
A
T'
r\
TZ
A
Gr:
mop
hone
Motor
.
A
mains
supply
is
not
provided
on
the
chassis
for
the
'
gramophone
motor,
since
this
may
cause
hum.
•
We
reconimend
"that
the
mains
leads
from
the
chassis
and
from-the
motor
ar;
taken
to
a
small
connecting
.block
in
the
cabinet
and
thence
to
the
mains
*
supply-.
This
moans
the
it
each
instrument
is
controlled
by
its
own
on/off
switch.
'
Page
4
v
'fape
Record.
A
co-axial
socket
is
provided
to
feed
a
tape
recorder.
”
Output
is
330
mV
at
100K
ohms
impedance
and
is
suitable
for
the
lower
sensitivity
^nput
of
almost
every
tape
recorder
available.
This
output
is
before
the
vVblurac
and
tone
controls
and
is
,
therefore,
independent
of
these
controls.
This
means
that
recordings
from
both
radio
and
pick-up
may
be
monitored
through
the
chassis
amplifier
and
loudspeaker.
With
the
,volume
control
at
minimum,
recordings
may
be
made
silently.
The
same
principles
apply
if
a
tape
deck
and
its
associated
tape
pro—amplifier
are
used
rather
than
a
complete
recorder
with
its
own
output
,
stage.
;
*
:
Tape
Replay
.
A
co-axia.1
socket
is
provided
to
allow
playback
through
the
chassis
amplifier
and
loudspeaker
either
from
a
complete
recorder
or
from
a
tape
dock
and
its
associated
tape
pre-amplifier.
The
inpu$;
sensitivity
is
500
mV
at
54K
ohms.
The
output
from
a
tape
pro-amplifier
can
be
fed
straight
into
this
input
and
it
is
suitable
for
all
known
available
makes.
On
most
models,
manufacturers
of
complete
tape
recorders
are
now
providing
an
output
for
high
quality
amplifiers
which
is
before
the
recorder
*
s
own
output
stages
and
consequently
its
tone
and
volume
controls.
If
this
facility
is-provided
■
idt:is
;
n
an
advantage
to
be
able
to
replay
tapes
through
the
Jubilee
Mk.
2.
tone
controls
and
amplifier.
CONTROLS
.
There
are
five
controls
which,
from
left
to
right,
are
as
follows.
1.
Volume
'Control
and
On/Off
Switch
.
■
2.
Treble
Tone
Control
.
Base-
■
Tone
Control
.
§§1gtfi?
I*-'
t
0
U
.o
controls
give
12dB0ut
&
10
dB
lift
at
their
respective
minimum
faxiMw
■
pc»4ti©ns*'''
R
At
'tfe8'
,
''to2fAiiiay
position,
i.;e.
-With
knob..®
r
-
/
s
^vertical,
the
controls
give
a
level
response
with
neither
lift
nor
cut.
4.
Selector
Switch:
Five
positions.
TAPE:,
.
GRAM.:
MEDIUM:
VHF.
LONG!
(Switch
to
the
TAPE
position
when
replaying
tape
but
for
recording
the
switch
is
set
to
whichever
source
is
being
recorded).
>
5.-
•
Tuning.
Control.
This
is
a
"Reverse
Vornier
Cord
Drive"
type
of
tuning
which
enaoios
you
to
tune
fast
in
-one
direction
and
then
finely
for
a
short
space
in
the
opposite
direction
in
order
to
obtain
the
precise
tuning
point*
This
will
be
found
to
be
particularly
useful
in
the
more
crowded
sections
of
the
medium
waveband.
(magic
eye)'Is
in
Circuit
on
long
and
medium
bands
5and.
The'biro
ad-tuning
on'VHF,
enhanced
by
the
but
IT®
thd
v
.
n
.i
r
.
UilllU.*
iliu
UUU
U
Uiix
-
-
-
~
.
,
automatic
frequency
control
circuit,
makes
it
unnecessary
for
the
indicator
to
be
used.
It
should
be
noted
that
on
long
and
medium
bands
the
movement
of
the
tuning
indicator
depends
on
the
strength
of
the
individual
transmissions*
On
very
weak
stations,
therefore,
there
is
likely
to
be
little
or
no
move¬
ment.
FITTING
THE
CHASSIS.
The
way
in
which
the
chassis
is
mounted
will
depend
very
much
on
individual
preference
but
there
are
several
points
worth
mentioning.
The
chassis
may
be
fixed
with
its
dial
in
either
the
vertical
or
the
horizontal
plane;
it
will
perform
with
equal
efficiency
in
either
case.
Page
5
should
be
mounted
so
that
reasonable
ventilation
is
available
for
the
heat
dissipated
by
the-
valves
and
power
pack.
■
■
Pour
3/16"
fixing
holes
are
provided
so
that
the
chassis
may
screwed
down,
The
board
on
which
it
is
mounted
should
be
of
reasonable,
tsickness
to
avoid
unnecessary
vibration.
Ajeaci£_|>oard
(;U«8.0.d)
cut
for
the
Jubilee
i:k.
2.
Chassis
is
available
ana
i.iay
be
useful
if
you
are
converting
an
old
radiogram.
It
is
veneered
out
unpolished
so
that
it
can
he
coloured
(we
cannot
ourselves
undertake
this;
to
suit
the
cabinet
into
which
it
is
fitted.
The
board
is
of
9
irjn®
\
a
pprox.
•§•
)
plywood
and
its
outside
dimensions
are
14
!
f
x
18
l
f
.
Tne
cut-out
for
the
dial
is
11.7/16"
x
44-"
with
rounded
corners
of
#"
&ri
i
^
v
c
control
spindle
holes
of
f"
diameter
should
be
centered
l
below
the
bottom
of
the
dial
cut-out.
rhe
middle
one'
of
the
five
is
centred
in
the
line
5.23/32''
from
the
edge
of
the
dial
cut-out*
i.e.
half¬
way
and
the
spindle
hole
centres
are
2"
apart.
If
you
are
cutting
a
facia
board
yourself*
the
template
provided
should
be
used.
A
Dial
Sscutcheon
(7/6d)
of
satinised
brass
is
available
and
may
be
used^with
the
facia
board
or
with
any
board
with
a
dial
cut-out
of
11.7/16"
by
43
"
and
of
9mm.
(approx
-f")
thickness.
If
the
board
is
of
less
thick¬
ness
the
escutcheon
r.ia.y
still
be
used
but
padding
may
be
necessary
at
the
back
of
the
board
so
that
it
fits
securely.
The
escutcheon
should
not
be
used
if
the
board
is
thicker-than
9
ram.
5h®o
8
V-0.3A
lamps
arc
provided
tQ..
illuminate
the
dial.
These
can
be--easily
replaced
by
sliding
the
glass
dial
upwards
so
that
the
lamps
may
be
unscrewed.
Page
6.
1'
.
.iLIGHIEj]NT
INSTRUCTI0N3,
FOR
JUBILEE
Mk.
2.
AF/FF
RADIOGRAM
CHaSSIS
.
Sguipment
required
An
AM
signal
generator
covering
150
Kc/s
to
1.5
I
c/s,
Modulated
30,.-
at
400
cps.
-*n
FM
generator
covering
10.7
Kc/s
and
87-108
Kc/s.
If
an
FM
generator
is
not
available
an
AM
generator
can
be
used.
See
alternative
alignment
instructions.
*''•
valve
voltmeter,.
or
a
20*000
ohms—per-volt
meter.
1.
S
o
t
Controls
as
follows:-
Volume
to
maximum.
■
Treble
to
minimum.
Bp.ss
to
minimum.
Selector
to
medium
wave.
Tuning
to
fully
mesh
tuning
condenser.
2.
Connect
a
15
ohm
load
and
AC
voltmetor
across
speaker
terminals.
3.
Using
a
warm
screw
driver
to
melt
wax-
unscrew
all
tuning
cores
until
they
are
about
j-"
from
fully
screwed
out
position.
■
riM
IF
Stages
.
4.
Connect
signal
generator
output
to
front
section
of
tuning
gang
(C23)
at
the
same
time
using
the
earthy
connection
of
the
generator
lead
to
short
out
the
roar
section
of
the
tuning
gang
(032).
;S'.Feed/in
a
4.30”
~&/a
modulated
signal
and
adjust
cores
L22*
121,
L14
and
L13
in
that
order
for
maximum
output
on
meter.
It
is
important
that
as
the
circuits
are
'brought
into
line
the
output
from
the
generator
should
be
decreased
so
that
the
reading
on
the
output
meter
does
not
exceed
50
niW
(or
2.5
volt).
AM
RF
and
Oscillator
Stages
6.
Connect
signal
generator
to
the
AM
aerial
and
sockets,,
via
a
dummy
aerial.
Feed
in
a
430
Kc/s
signal.and
adjust
core
of
L10
for
minimum
\
/
output.
-
7.
Qheck
that,
the
cursor
is
in
line
with
end
of
scale’when
the
tuning
gang
’
is
.fully
open.
.
/
:-v
.
8.
With
the
receiver
switched
to
M.W.
and
tuned
to
600
Kc/s
(500
m),
feed
modulated
600
Kc/sts
signal
and
adjust
core
of
120.
for
maximum
out-
1
§|
T;.
./$^n
adjust-
the
jiositl-ono
of
aerial
coil'
(112)
on
ferrite
rod
for
NOTE*
It-is
important
to
keep
the
output
from
the
signal
generator
as
.j
low
as
possible,,
as
in
section
5.
9.
Tune
the
receiver
to
1.5
Fc/s
(200
ra)
feed
in
a
1.5
Mc/s
signal'and
adjust
C31
for
maximum
output.-
Then
adjust
C22
for
maximum
output.
10.
Repeat
operations
8
and
9
until-
no
improvement
in
calibration
or
output
can
be'
obtained.
11.
Switch
receiver
to
l.w.
and
tune
to
200
Kc/s
(150
m).
Feed
in
a
200
Kc/s
signal
and
adjust
core
of
118
for
maximum
output.
Then
adjust
position
of
aerial
coil
111
on
ferrite
rod
for
maximum
output.
NOTE:
There
is
no
trimming
adjustment
on
l.w,
band.
Page?
7
wlth-P
K
Generator
.
13.
15,
12.
switch
receiver
to
F.M.
Remove
output
meter.
Connect
valve-voltmeter
or
20,000
ohms-per-volt
meter
across
049
and
set
it
to
the
10
v<?lt
D.O.
range,
rune
receiver
to
100
kc/s
(approx).
Set
all
other
controls
ha
in
setting
up
procedure.
Connect
PM
signal
generator
to
control
grid
of
V3
(win
2.)
Feed
in
n
^
10.7
Me/s
signal
deviated
by
±
25
Kc/s
and
adjust
cores
of
L24.
L23
for
maximum
reading
on
voltmeter.
/
14.
Transfer
signal
generator
to
control
grid
of
V2
(Pin
2).
Adjust
cores
of
L16,
L15
for
maximum
reading.
Li
ng
„
Transfer
signal
generator
to
vl
using
a
capacity
clip
round
envelope
of
valvo
and
adjust
cores
of
L8,
L7
for
maximum
reading.
1G.
With
generator
still
oonnected
to
VI
repeat
adjustments
as
in
13,
14
and
15
until
no
further
increase
in
reading
on
voltmeter
can
bo
obtained.
Adjustment
of
Neutralizing
Condenser
08
dOfEs
This
adjustment
must
be
carefully
carried
out,
as
any
error
may
make
the
tracking
of
the
R„F„
coil
impossible.
diode
probe
such
as
that
supplied
with
certain
types
of
FM
generators
or
valve
voltmeters
is
required
for
this
adjustment.
If
a
probe
is
not
available
a
detector
circuit
must
be
made
up
as
shown
and
is
used
in
conjunction
with
the
valve-voltmeter
o.f
20,000
ohms-per-volt
meter.
TO
VALVE
VjMETER
OR
MICRO
AMMETER
17.
Disconnect
signal
generator.-
Connect
valve-voltmeter
on
AO
range
(via
diode
probe
or
DC
range
and
above
circuit)
between
the
anode
"pin
of
VIA
(Pin
1)
and
chassis.
Tune
the
receiver
to
95
Kc/s
and
adjust
08
for
minimum
output.
•
If
a
valve-voltmeter
is
;
not
available
a
micro-ammeter
cmi
be
used
with
a
diode
probe
as
above.
.
18.
Disconnect
diode
probe
and
reconnect
meter
across
049
as
in
12.
Connect
signal
generat
r
to
FM
aerial
socket.
Tune
receiver
to
104
Kc/s.
Feed
in
a
104
Mc/s
signal
and
adjust
Cores
of
L6
and
L4
for
maximum
reading
on
voltmeter.
19.
Check
calibration
at
90
Mc/s.
If
there
is
more
than
±0.5
Mc/s
error
adjust
spacing
on
tuning
condenser
vanes
012
and
06.
Re-check
calibration
at
104
Mc/s
and
repeat
adjustment
until
there
is
no
further
improvement
in
calibration.
NOTE:
Only
a
very
slight
adjustment
to
012
should
bo
needed.
Bent
out
if
receiver
tunes
high,
bent
in
if
receiver
tunes.low.
Use
the
same
method
on
the
RF
section
C.6.
1
-
20.
Tune
receiver
to
96
Mc/s
foen
in
a
96
Mc/s
signal
and
adjust
cores
of
L3
for
maximum
output.
Pago
8
alternative
PI,I
Alignment
using
an
AH
Signal
Generator
.
21.
Connect
DC
voltmeter
across
C49.
22.
Pully
unscrew
core
of
L24*
Then
using
a
10.7
Ko/s
unr.ioemulated
signal
carry
out
alignment
as
in
PM
alignment
with
PM
generator
sections
12,
i;
,
13,
14,
15
and
16.
BUT
DO
HOT
TOUCH
L24
during
this.
23.
With
a
10.7
Mc/s
unmodulated
signal
fed
in
via
vl
screw
in
core
of
L24
and
adjust
for
zero
volts
with
the
DC
voltmeter
connected
between*
the
junction
of
L25.
R22
and
earth.
24.
Then
carry
out
adjustment,
of
C8
as
described
under
"Adjustment
of
Neutralizing
Condenser
C8".
r
25.
.Carry
out
RF
and
oscillator
alignment
as
described
under
PM
alignment
with
PM
generator
parts,
18,
19
arid
20.
VOLTAGE
TABLE
Main
Voltage
=
235
v
Voltage
adjusting
plug
on
240
-
250
tap.
No
Signal
input.
'
Receiver
switched
as
indicated.
A
Volume.
Treble
and
Bass
controls
“Set
to
minimum.
•
ov
;
All
readings
taken
on
AVO
Model
8
1000
v
range
except
where
other¬
wise
indicated.
•
•
CIRCUIT
REF.
V-'-LVE
.ANODE.'
SCREEN
GRID
SELECTOR
—
..
.
.
..
'a.yww
s
.t-m.;-
.
.
.
.
.
.
.y.
.
-
—
'
Via
ECC$5
-
-
1.4
.
1
PM
Vlh
H
170
-
-1.0.
1
ti
V2.
:
ECH81
Heptode
-
190
50(2)
-0.6
1
mw
V2
:
ECH81
Triodo'
90
...
-7
'<
it
V3
SF89
190
85
-0.6
ti;
tt
V4
EB91
-
-
-
tt
V5
.
EM81
190
30
-0.6
;i;
tt
V6a
ECC85
170
—
-0.5
1
m
V6b
ECC85
130
-
-0.6
1
m
V7a
'ECL82
Triodc-
60
-
1.0
3
tt
V7b
ECL82
Triode
198
170
-3.2
W
tt
V8a
ECL82
Triode
115.
-
tt
V8b
ECL82
Triode
198
170
"
—3.2
1
ui
|
!
*
;
;
tt
V9
EZ81
205
(4)
-
240
‘
■
■
■
ft
1
()
.
:
.V-
a
1.
•
Measured
on
lOv
DC
range.
2.
74
volts
when
switched
to
PM.
3..
Measured
from
cathode
to
chassis.
4.
_.C
1000
v
range.
PLAN
V/EW
UNDE
PS
IDE
V/EW
VALVE
BASE
DIAGRAMS
-
DRAWN
AS
SEEN
FROM
UNDERSIDE
OF
BASE
COMPONENT
VALUES
CAPACITORS
RESISTORS
Cl
63pF.
C35
450pF.
R1
22
ohm.
R35
82K.ohm.
C2
20pF.
C36
0.01
mfd.
R2
150
ohm.
R36
2?0K.ohm.
C3
0.003
mfd.
C37
0.01
mfd.
R3
1
M.ohm.
R37
lOOK.phm.
C4
5pF.
C38
0.01
mfd.
R4
5
.
6
K
.
o
h
m.
R3-3
10
OK.
ohm.
C5
220pF.
C39
250pF.
R5
47K.ohm.
R39
27K.ohm.
06
-
C40
250pF.
R
6
IK.ohm.
R40
6
.
8
K
.o
h
m.
C7
50pF.
C41
lOpF.
R7
5
•
6
E
.
ohm.
R41
68
O
K.ohm.
C
8
3-30pF.
C42
35pF.
R
8
220
ohm.
R42
27K.ohm.
C9
280pF.
C43
0.01
mfd.
R9
4702
v.ohm.
R43
15
O
K.ohm.
CIO
20pP.
C44
150pF.
RIO
lOM.ohm.
R44
6
.
8
K
.
o
h
m.
Cll
lOOpF.
045
280pP.
Rll
Hi.
ohm.
R45
lOOK.ohm.
C12
-
046
280pF.
R12
12K.ohm.
R46
270K.ohm.
C13
lOpF.
C47
280pF.
R13
1M.ohm.
R
4
7
47K.ohm.
C14
20pF.
C
4
8
280pF.
R14
27K.ohm.
R48
270K.ohm.
C15
0.003
mfd.
C49
4
mfd.
R15
27K.ohm.
R49
2
.
2
K
.o
h
m.
C16
0.1
mfd.
C50
0.01
mfd.
R16
47K.ohm.
R50
47K.ohm.
C17
0.1
mfd.
C51
0.1
mfd.
R17
27
K
.
ohm.
R51
lOOK.ohm.
C18
450pF.
C52
280pP.
R18
27K.ohm.
R52
lOOK.ohm.
C19
0.002
mfd.
C53
0.002
mfd.
R19
M.ohm.
R53
680K,ohm.
C20
0.005
mfd.
C54
0.002
mfd.
R20
270K.ohm.
R54
680K.ohm.
C21
85pF.
C55
0.005
mfd.
R21
1M.ohm.
R55
47K.ohm.
C22
-
C56
25
mfd.
R22
47
ohm.
R56
47K.ohm.
C23
•-
C57
25
mfd.
R23
ISOK.ohm.
R57
2
.
2
K
.
o
h
m.
C24
lOOpF.
C58
0.1
mfd.
R24
1.5K.ohm.
R58
470
ohm.
C25
0.01
mfd.
C59
lOOpF.
R25
2
.
7
K.ohm.
R59
470
ohm.
C26
250pF.
C
6
0
O.Glmfd.
R26
2.7K.ohm.
R60
M.ohm.
C27
250pF.
C61
0.01
mfd.
R27
2.7K.ohm.
R61
390
ohm.
C28
20pF.
C62
0.01
mfd.
R28
39K.ohm.
,
R62
lOM.ohm.
om-
SOp-P
i-
-
*50
mf
d.
^,,R29
E&jrrSffiCr
R30
'*lM.
ohm.
“^-
■
5
36
5
-
lOOr.ohm.
C30
47pF.
C64
50
mfd.
C31
i
_
j
•
•
065
50
mfd.
R31
270
K.ohm.
C32
-
C
6
6
50
mfd.
R32
4
7
OK.
ohm.
C33
147pP.
C67
0.01
mfd.
R33
M.ohm.
C34
220pF.
C
6
8
0.01
mfd.
R34
IE.
ohm.
069
0.01
mfd.
POTENTIOUSTERS
VR1
M.ohm,
log,
Treble.
VR2
lM.ohm,
log,
Bass.
VR3
M.ohm,
11
L
21
__
log,
Volume.
•FA.l.
g|]—m.io.
6.6
ohms.
6.6
ohm
.
L3J
14
PR.
1.
.SJ3—
—
15
"L_
16
J
F
0.1
3.5
ohm.
0.2
ohm
.
171.
18-T
IFT.9
0.7
0.5
ohm.
ohm.
12
?
]
—
®
0
.
'l.
3.7
ohn.
1
.
7
ohm
.
19
110
RFC.
I.F.
Rej.
0.5
3.5
ohm.
ohm.
I
22
]
-
i
n
-
1
1
-
6.6
ohm.
6.6
ohn
.
ill
FER.
5.5
ohm.
123~
0
.
6
ohn
.
112
PER.
0.6
ohm.
124
-
R
DT.l.
'
0.25
ohn.
125-
-
Tla
280
ohm.
T2a
110-
ohm.
VA1V3S
•
via-
b,
ECC85
.
C
.
9
ohm.
b
11
C
ohm
.
72,
ECH81.
V
3
,
EF89.
c
—
c
21
ohm.
V4,
EB91.
V5,
EM81.
V
6
a
-
b
,
ECC85•
V7a-b,
EC182.
V9,
EZ81.
V
8
a
-
b
,
SC182.
11,
0A81.
D2
,
0A81.
Table of contents
