HP barney oliver audio schematic
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AMPUFIER
==========
The
Barney
Oliver
Audio
Amplifier
TableofContents
Section
I.
II.
III.
TABLE
OF CONTENTS
DESCRIPTION
A.
General
B.
Specifications
FRONT
A. INPUT
B. MODE
C.
D. VOLUME
E.
F. BASS
PANEL
FILTER
Phono
Switch
CONTROLS
Selector
Switch.
Switch
Control
Equalization
(FLAT,
.
.
Switch
BOOST) . . . . . . .
INSTALLATION
A.
Phono
B.
UseofPhonograph
C.
Speaker
Speaker
D.
E. Line Voltage,
115/230
F.
G. Installing
Connections
Connections
Placement
Frequency
Volt
Amplifiers
Amplifierinan
Pickups
. . . . . . . .
. . . . . . . . . .
and
(European
Existing
H. AssemblyofWalnutorTeak
Rack
I.
J. Pictures
Mounting
and
Cabinet
Outline
. .
Drawing
(-6dB, RIAA, +6dB)
Other
Than
Shure
Line Fusing .
Units) .
Cabinet
Enclosure
V-15
Type
Page
1-1
1-2
2-1
2-1
2-1
2-1
2-2
2-2
.
II
3-1
3-2
3-2
3-2
3-3
3-3
3-3
3-3
3-4
3-4
IV.
v
VI.
VII.
LOUDSPEAKER
CIRCUIT
A.
B.
C.
D.
CIRCUIT
A.
B.
C.
Dl.
D2.
E;
PARTS
A.
B.
C.
D.
E.
DESCRIPTIONS
Phono
Filter
Power
Power
Pre-Amplifier
Board
Amplifier
Supply
DIAGRAMS
Phono
Filter
Power
Power
Primary
Deck
Pre-Amplifier
and
Amplifier
Supply
Circuits . . . . .
Wiring (See Sections VI, A,B,C,
LISTS
Phono
Filter
Power
Power
Deck
Pre-Amplifier
Board
Amplifier
Supply
Parts
PHASING
.
Controls
one
. . . . . .
. .
.
Channel
and
4-1
5-1
5-1
5-2
5-2
6-1
6-2
6-3
6-4
6-5
D.)
7-1
7-2
7-3
7-4
7-5
The
Barney Oliver
Audio
Amplifier
Description
A.
GENERAL
The
quality
two
home,
auditoriums.
quency
with
decks,
enoughtorequire
flat
additiontothe
phono
of
several magnetic
amplifiers provide
the
RIAA
in preamplifier
direct
input
Adding
the
preamplifier
circuit
panel holes as required,
wiring.
result
routing
hum
been
The
class-B
biased
distortion.
back, ranging
low
frequencies
audio
monic
Barney Oliver Amplifier is a high
all solid
channel
in studios,
range 8
signal sources
AM
preamplifiers designedtooperate
recording characteristic.
moving coil
from
this
connectors
Hum
of
careful
on
is well
minimized
output
to
and
range
and
state
stereo
and
It
is
intended
to
16
and
FM
power
phono
the
boards
microphone
low-level, high
feature
and
printed
below
stages
reduce
locally
A large
from
further
inter-modulation
will
boards,
in
distortion
attention
thermal
by
optimum
of
standby
degeneratedtoreduce
amountofoverall negative feed-
over
to
over
audio
sound
(phonograph
tunners)
the
circuit
reduces
amplifier designed
reproduction
in small
for
ohm
speaker
that
littleorno
amplifiers,
cartridges. These pre-
necessary
have
been
impedance
require
install
deck,
and
modify
are inaudible. As a
to
filtering
boards,
noise (which itself has
input
the
amplifiers are
power
100
dB
50
dBatthe
any
distortion.
DESCRIPTION
to
medium
use
with
systems
pickups,
are themselves
equalization.
the
unit
from
equalization
Additional
designed
inputorfor
that
the
user
and
wire
drill
front
selector
andtolead
the
stage design).
operated
drain
crossover
loop
gainatdc
top
remaining har-
Since
SECTION
for
in
the
sized
full fre-
and
tape
In
includes
any
for
plug-
for
direct
sources.
build
printed
or
rear
switch
residual
and
are
and
of
the
the
I
/-l-circuits are
no
long
simply clipped
at
its
proper
cause
onlyafraction
typically
the
amplifiers,
control
maintained
rapidly
amplifier
beyond
transients arising
records
end
20
the
of,
damage from accidental short-circuits
puts.
sustained
tective fuses.
are
from
reducing switching transients. A balanced build-up
and
balancing
transients in
low
turn-on
of
fundamental.
Bridged-tee
board,
below
or
response is
kc
by
amplifiers against overload
strong
The
Momentary
either
test
Finally, considerable
decay
voltage regulated supplies
transient
direct
time
constant
and
value immediately afterward.
the
large
of
showatotal
networksinthe
and
active filters in
enable
down
the
and
loudspeakers from being driven
their
linear excursions
breath
another
r-f signals.
power
shorts
current
probes
of
blasts
reduced
amplifiers are
may
In
addition,
will in general cause
of
power
function
the
amplifiers. A slow
from
coupled, overload produces
transients;
the
original waveform resumes
amount
a dB below
distortion
the
low-end responsetobe
to
20
Hz
audible range. This prevents
from
such
into
microphones.
at
18
pairofactive filterstoprotect
shorts
limited
will have
blow
oneormoreofthe
all
power
or
effort
supply
drops
minimizes
the
pre-amplifiers.
the
peaks are
of
feedback, signals
actual
over75dB below
8-circuitsofthe
the
and
to
by
sources
dB
per
by,orrectification
protected
fused so
was
voltages
further
overload
mixing and
fall
off
low
frequency
as
warped
The
octave above
against
at
their
no
effect, But
supply
turn-oninthe
outputs
that
shorts
no
damage.
devoted
and
careful
the
turn-on
reduces
very
high
out-
pro-
Be-
the
the
to
1-1
Description
SPECIFICATIONS
The
Barney Oliver Audio Amplifier
OUTPUT PER CHANNEL
SPEAKER Z
16
8
4
CONTINUOUS* AUDIO PEAK
::::::36
::::::50W
**
W
::::::90W
::::::160W
::::::80W
HARMONIC DISTORTION
<0.01
%,
2
mw
to
max. power, all freqs.
HUM
AND NOISE
100
db
Power Amplifier:
t
Phono
Preamp:
below
84dbbelow
one
max.
volt
INPUT VOLTAGE FOR FULL OUTPUT
Tuner, Tape,
Aux1,Aux
2:
~1.0
Phono:~5 mv rms
INPUT IMPEDANCE
Tuner, Tape,
Phono:
Aux1,Aux2:100
Optimized
for
K n
SHURE V-15
Pickup.
CONTROLS
INPUT:
TUNER,
TAPE, PHONO, AUX
AUX 2.
output
output
volt
Type
rms
II
1,
FREQUENCY RESPONSE
+1
+1
+
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h!I~~T
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o+l-J+-
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I!
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f I I
II
-101+1
-'-+1-+
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,OUT
.11++
1"'-N~-+----==t"'+-++----1I--+-+++-""'od-.=-+-+-I_+____1
1 i ! : I I
Ii:
i Frequency Response
+----+---+----+-++----1-+-+-+-Hf
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10
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100
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1000
FREQUENCY
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1001
CONTROLS (Cont'd.)
FILTER:
>
18
20
Controls active
dB/octave
kHz. Includes
h.f
with
comerat5,8,10
30
dB
notch
roll-off filter
or
at
10
kHz
in 5 and 8 kHz positions.
VOLUME: Dual precision
attenuator,
range, 2 dB steps. Eliminates
balance
BASS:
Response: RIAA,
control.
FLAT,
BOOST
+ 6 dB, - 6 dB
need
60
dB
for
MODE:
STEREO -
DIR(ect),
MONO-DUAL,
REV(erse), L, R
L, R
*Both channels operating simultaneously
maximum
**Continuous high
than
8 n
output.
power
not
recommended. See instruction
operation
manual.
t
Hum
pickup
by
phono
cartridge
this figure to be exceeded.
1-2
may
at
at
less
cause
SIZE:
16.72"
10.93"
(425
(278
mm)
mm)
wide,
deep
WEIGHT
Approximately
20
pounds
POWER REQUIREMENTS
115
or
230
V.A.C. ± 10%, 50-60 Hz,
standby
16n(both
power,
channels).
135
5.0"
behind
W
at
net
full
(127
panel.
without
output
mm)
high,
case.
20
into
W
The
Barney
Oliver
Audio
Amplifier
Front
Panel Controls
Simplicity
withaminimum
mark
withacolored
special
or
settings
input
A.
five
purpose
technically
selector
INPUT Selector
This
inputs.
TUNER
TAPE
and
switch
naive
achieve
From
of
operation
of
controls.Itis a
dot
the
controlssothat
operator
good
and
volume
allows a
left
Accepts
dBm)
tuner.
Accepts
dBm)
or
to
from
single
choice
right
input
input
from
channel
SECTION
II
FRONTPANELCONTROLS
other
one
Switch
be
introduced.
Both
ered
Monophonic
"left"
Monophonic
"right"
speakers.
signal sources
(STEREO
has
been
achieved
good
idea
"normal"
the
need
results
control.
these
FM, AM,orFM/AM
an
settings
inexperienced
only
ch-eck
using
of
at
at
equalized
tape
only
anyone
are:
line level (0
line level (0
deck.
to
of
these
the
of
stereo
DUAL
L
R
The
Land
tapes
over
side) speakers.
C.
roll-offs
positions
and
either
FILTER
This
control
to
are:
channels
to
both
channel
R
positions
allows various high
mixed
speakers.
reproduction
over
reproduction
channel
allow
to
side)orboth
From
left
and
both
speakers.
over
monophonic
be
reproduced
(MONO
frequency
to
right
deliv-
of
of
both
the
PHONO
AUX
1
AUX2
MODE Switch
B.
This
nels
of
the
in
various ways.
stereo
operation.
L
R
REV
DIR
control
input
Accepts
stereo
Accepts
level
tape
allows
to
The
From
Left
speaker.
Right
right
Stereo
channel
channel
Direct
channeltocorresponding
-Normal
input
phonograph
inputs
audio
circuit
decksorother
the
left
be
delivered
center
positionisnormal
lefttoright
stereo
channel
stereo
speaker.
channels
to
right
to
left
presentation.
position.
fromamagnetic
pickup.
from
suchastuners,
sources.
and
to
the
the
onlytoleft
channel
reversed.
speaker,
speaker.
Each
any
right
speakers
modes
only
speaker
line-
chan-
for
are:
to
Left
right
stereo
5
8
10
20
D.
VOLUME
A
dual
ment
perceptible)
the
the
the
of
attenuation
feedback
nuisance
Introduces
offat5 kHz,
kHz. Useful
records
Introduces
off
kHz. Useful
records
Introducesamaximally
dB/octave
ful
Normal
maximally
offat20
Control
precision
the
sound
steps over a
is precisely
assures
and
and
at
8 kHz
and
for
slightly noisy
attenuator
level
equal
hazard
a high
a high
cutoffat10
position.
flat18dB/octave
kHz.
in
60
balanced
gaininboth
of
frequency
withanullat10
for
noisy
AM
reception.
frequency
with
a nullat10
for
good
AM
reception.
conditions.
Introduces
allows adjust-
2
dB
(or
dB range. Because
and
an
improperly
cut-
78
rpm
cut-
78
rpm
flat
18
kHz. Use-
cut-
scarcely
because
channels,
set
a
2-1
Front
Panel Controls
The
Barney Oliver
Audio
Amplifier
balance
control
speakers are assumed.
good
manufacture
of
each
other
the
two
channelsofa good phono-cartridge. However,
the
components
the
"hot"
E.
Phono Equalization Switch (-6 dB,
+6 dB)
Below
tive only in
are eliminated.
will ordinarily
over
the
perfectionist
and
introduce
side.)
the
INPUT
the
PHONO
Good
audio
quality
range. Likewise
may
want
appropriate
selector
control,
positionofthat
a three-position slide switch allows
sation
mal) position,
RIAA equalization.
frequency response is
the
6 dB.
Gramophone)
ifications, while
for
recording defects.
this
right position,
Some
manufacturers
conscientiously
others
In
switch provides
In
the
left
position,
dropped
the
response is
by
(such as
adheretoRIAA
(names suppliedonrequest)
(Note:
Identical
speakers
be
within
to
test
loss
RIAA,
and
control,
some
compen-
the
center
the
standard
the
6 dB, while in
enhanced
Deutsche
of
1 dB
for
his
into
effec-
(Nor-
high
by
spec-
enhance
deficiencies
the
of
high
the
speakers are flat,
correct
better
your
F.
controlisthe
BOOST
6
BOOST
provided
speakers.
fortunate
woofers
as LE-15A's
this
in
the
ears)
need
BASS Switch
Located
position,
dB/octave
position,
for
(Two
enough
with
practice.Ifyou
majority
below
two-position
from
the
real polesat80
or
larger enclosures),
compensate
bottom
levels,
the
of
the
the
FLAT
end
to
compensate
usual
the
playback
-6
dB
find
of
cases,
system.Ifyour
position
the+6dB
your
attention.
(FLAT,
the
BOOST)
high
frequency
BASS switch.
the
switch
80
Hz
approximate
raises
down
the
to
20
compensation
usual low-end roll-off
polesat40-50
to
have
an
ALTEC
the
411-A's
BOOST
low-end roll-off
audio
range.
Hz).Ifyou
overdamped
Hz
and
in
position
down
For
very high
positionisrecommended.
for
will
position
speakers
FILTER
In
response
Hz.Inthe
of
good
pair
20
Hz (such
9 cu. ft.
will closely
to
sound
the
help
(or
the
at
is
are
of
or
the
2-2
The
Barney
Oliver
Audio
Amplifier
Installation
A.
PHONO CONNECTIONS
Special
the
PHONO
and
series
ance faced
the
high
precautions
input.
feedbackisusedtocontrol
by
the
end
roll-off
ing characteristic,
is
not
grounded
MUST
NOT
TOGETHER
further
are
information.)
used
for
inside
BE
GROUNDED
externally.
each
must
Because a
cartridge
combinationofshunt
and
requiredbythe
the
"LOW"
the
amplifier
(See
If
coaxialorshielded wires
channel,
the
SECTION
INSTALLATION
be
observed
the
thereby
RIAA
sideofeach
and
OR
CONNECTED
Section
two
V, A.
inner
for
imped-
produce
record-
input
THESE
for
shields
III
must
be
insulated
outer
shield
In
some
cartridges,
channels is
at
one
or
THESE
MOVED BY
WITH A
shield
at
end
done,
ground
GROUNDING
LARGE
shouldbeconnectedtothe
one
end
using
the
test
before
from
around
grounded
both
LOW terminals.
PRYING
NEEDLE
andtothe
binding
that
both
connecting
each
other
and
both
as
shown
the
LOW sideofoneorboth
to
the
case
in
byathin
IF
PRESENT,
STRAPS MUST BE RE-
THEM OUT AND
OR
PICK.
The
turntable
amplifier chassisatthe
post
provided.
After
channels are isolated
them
to
the
from
the
Figure
l.
strap
OFF
overall
frame
other
this is
from
amplifier.
NOTE:
Inner
shields
end. Also
together
pickup).
Outer'
shield
inner
at
any
Cables
must
should
must
not
shields
point
not
be
must
(including
have
insulation
make
TO
GROUND
ON
CONNECTION
REAROfAMPLIfiER
grounded
not
be
connected
at
over shields.
contact
Figure 1. Phono Connections
at
or
with
either
inside
any
lead
connecting
inner
In
shields).
some
necessary;
chassis
should
(ground
preferably
TO
CHASSISOfTURNTABLE
OR
CHANGER
pickup
locations
in
terminal
such
be
connected
on
the
cases,
insulated.
to
amplifier (including
outer
turntable
to
rear)
withaseparate
shield
may
or
changer
amplifier chassis
not
be
wire,
3-1
Installation
The
phono
as
is convenient from
other
source
installation
should
volume
B.
be
control
USE
THAN
The
are optimized
Other
good quality pickups
resistor change
boards
may
are designated R1 as
cartridge
of
AC
and
a good cartridge,
audible evenatthe
and
OF PHONOGRAPH PICKUPS
SHURE
phonograph
for
the
on
be required.
shouldbelocatedasfar
any
transformers,
magnetic field. With
no
full setting
with
bass
boost.
V15
TYPE II
pre-amplifiers
Shure
each
shown
V15
of
The
near
TypeIIpickup.
can
be
the
phono
resistors in
the
as
used,
left
motors,
proper
AC
of
OTHER
shipped
pre-amp
question
side
the pre-amp schematic in Section VI, A.
determine
pickup,
up
mustbeknown.
then
Where Lois
pickup internal resistance in ohms,
the
optimum
the
inductance
and
The
be calculatedbyusing
r\
L 6
\R
=_0_
1
x
10
-
.75 0
pickup
inductanceinHenries, Rois
value
for
R1
resistanceofthe
value
for
resistor R1
the
following
100
R -
20K
for
equation:
~
and
a given
R1 is in
ohms.
the
Once
R1 resistors
boards
shouldbechangedtothe
additional
value
on
information,
each
for
R1
of
the
see
SectionV,A.
has
two
been
phono
proper
calculated
pre-amJ
value.
hum
but
pick-
may
For
or
the
of
To
C.
venient distance
pairs
may
speakers
longer
mended.
cables
speaker
the
a
rearofthe
solderedtothe
to
or
the
tape
sleeve
D. SPEAKER
endsofthe
listener
angle, i.e.,
to
as
then
perpendicular
speakers.
The
Barney
SPEAKER CONNECTIONS
The
amplifier
may
from
of
No.
18
wireorlargerorordinary
be
used
to
connect
if
the
distance is
distances, heavier
In
general
or
cords
should
Oliver
be
the
conductors
the
not
impedance.
Connection
two-terminal
avoid
internal
solder bridges.
wire
and
or
heat
after
The
loudspeakers
at
the
two
shown
in Figure 2.
be
heard
to
polarized
amplifier.
mating
short
lugs
from
shrinkable
soldering.
PLACEMENT
base
of
the
apex.
the
angle
speakers
up
bisector
the
amplifier
The
cordsorcables
plugs provided,
circuits
It
is
good
each
tubing
should
an
isosceles triangle
The
apex
between
should
Good
to
450on
of
Audio
located
Amplifier
at
any
con-
loudspeakers. Twisted
zip-cord
the
amplifiers
under
100
feet.
to
the
For
are recom-
d-c resistance
exceed
outputs
Jones
socketsatthe
5%
of
of
is via
the
the
must
practice
other
be
the
from
inside
be
located
angle
the
about
sound
either
line
taking
wire
to
with
of
lines
150to
quality
side
between
care
strands
insulate
electrical
the
plug
at
the
with
the
this tri-
of
sight
45
will
of
the
the
be
0
,
LEFT
SPEAKER
~~~~
RIGHT
I
I
I
I
I
SPEAKER
I
I
I
Figure
2.
3-2
The
E.
Barney
LINE
FUSING
Oliver
VOLTAGE,
Audio
Amplifier
FREQUENCY
Unless specifically tagged otherwise, amplifiers
operate
have single
be
230-115V
The
only
power
connected
step-down
proper
on
115V
transformer
for
230V
line fuse
ac line.
primaries
operation.
transformer
for
115V
115V
(An
may
unitsis1.6
slow-blow.
Satisfactory
line voltages
or
230V)
50
Hzorgreater. A
is
recommended
is
not
ate
ground
phono,
F.
within
115/230V
230V
value.
grounded
mikeorother
115V/230V
Units
shipped
the
power
Units
shippedtoEurope
operation
slow-blow fuses. Becauseofthe
used,
amplifiers
line cords.
amplifieriscompatible
and
it
is assumed
proper
will be
cord.
prominently
115/230
United
will use
equipped
will
be
States
1.6
with
tagged
Amplifiers
ers
maybereconnected
voltage.
two
for
115V
halves
230V,
operation
within
The
±10%
line
groundingorthree
but
not
through
may
be
needed
low
AMPLIFIERS
to
Europe
United
States)
transformers.
and
willbeequipped
shippedtoEurope
The
line
connector
with
that
Units
connected
tagged.
V amplifiers
willbeconnected
amp
slow-blow fuses,
standard
to
indicate
with
115/230V
operation
of
the
transformer
the
two
halves
will
be
obtained
of
the
nominal
frequency
essential.Ifthe
the
power
to
level
cord,
get
ridofhum
inputs.
(European Units)
(and
in a few cases
are
equipped
willbeconnected
with
varietyofac plugs
will
on
the
European
the
user
can
for
230
shipped
for
115V
and
line cords. These
115/230
power
by
the
user
for
requires
connecting
primaryinparallel;
must
be
connected
series.
-NOTE-
When
reconnecting
must
be
connected
eous
flux
have
the
The
line fuse
the
line voltage (1.6
taken
in
produced
same
transformer
to
an
insure
"aiding
by
that
sense"
both
polarity).
mustbechanged
amp
for
primaries, care
windings are
(instantan-
windings
when
115V;.8amp
230V).
AND
LINE
amplifiers
and
cannot
external
be
used.)
amp,
with
(115V
should
wire
socket
chassis
a separ-
with
0.8
amp
not
include
rearofthe
line
cords,
obtain
operation
within
operation,
will
units
capability.
transform-
either
must
changing
be
on
for
the
the
be
line
the
in
for
G.
INSTALLING
ING CABINET
If
the
isting
cabinet,
the
outline
Because
supply
that
is
capacitors, are
the
not
very great
amplifier is
drawing
certain
overhang
AMPLIFIER
careful
attention
shown
components,
quite
at
the
andatthe
IN AN EXIST-
to
be
installedinan ex-
shouldbepaid
in
Sect~op
especially
large,itwill be seen
top
of
the
bottom
edgeisvirtulllly
zero. This will require considerable care
the
necessary
recommended
detail
before
mistakes. Referring
line drawing
overall
front
heightis4.85",
high. This will
somewhat
canbetipped
Front
mately
ontal
H. ASSEMBLY OF WALNUT OR
1,4", requiring less precision
dimension.
CLOSURE
If
the
included
as
outlined
of
assembled enclosure.)
The
Two
Black vinyl-clad
hole
in
the
cabinet.Itis strongly
that
the
panel
less
laying
in
Section
and
make
than
amplifier
out
this holetoprevent
to
the
III, J.,itwillbeseen
heightis5",
that
the
possible
4.85"
be
side view
that
the
side gussets 'are
the
use
high,ifthe
slightly asitis inserted.
panel overhangateach side is approxi-
in
walnut
with
below. (See
enclosure
wood
or
teak
enclosure
your
amplifier,itmaybeassembled
kit
consistsofthe
side panels
aluminum
Section
(one
III, J.
right
top
and
retaining screw.
Four
10-32
for
attaching
Wood side panels have
finished.Itis
be
finish
sanded
400or600
please.
which
One
can
be
an oil finish,
stores
and
finish materials
If
a high-gloss finish is desired,itwill be
necessary
ing
is
referred
and
to
applying
flat-head Allen screws
side panelstoamplifier.
been
recommended
with
grit.
They
quick, simple
done
by
with
or
many
(one
apply
hardware
brand
fillertothe
finish.
to
his friendly
can
that
fine
sandpaper
then
and
most
anyone
without
stores sell Danish oil
is Watco).
wood
For
this process
paint
sanded
the
be
finished as
beautiful
stain. Most
storeorcabinet
shop.
Installa.tion
III, J.
the
power
front
panel
in
cutting
examined
costly
in
the
rear
panel
4.48"
of
a hole
amplifier
the
horiz-
TEAK
option
f~r
picture
following:
one
cover with
and
but
wood
pieces
such as
finish
anywhere
paint
before
stain-
the
to
in
outthat
EN-
was
left).
nuts
not
you
is
user
3-3
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