Ampex 622 User manual
www.SteamPoweredRadio.Com
-
-
622
AMPLIFIER
LOUDSPEAKER
ASSEMBLY
APRIL,
'1883
AMPEX
CORPORATION
-
AUDIO
DIV
i
■
I
CN
IMPORTANT
NOTE
This
manual
, while it is a separ
ate
manual
in
itself, is also designed to fit into
and
become
part
of the
manual
for
the
AMPEX
Model 602
Tape
R
ecorder
/ Re
producer.
To
accomplish
this: s
im
ply remove the staples holding this
manuaJ together; throw away
the
cover
and
this page;
and
insert
the
balance
of
this
man
-
ual
in
the 602 ma
nual
behind section 10"Basic
Concepts
of
Magnetic
Tape
Re
cording
."
Except
for the cover,
the
622
manual
is pre-punched
and
divider
card
is included
for
use
with
the
602
manual
.
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-
DESCRIPTION
In
the
design
of
the Model 622 Amplifier
Loudspeaker Assembly,
AMPEX
engineers
have
created
an
equipment which provides sound
quality
that
would be
remarkab
le from an am-
plifier loudspeaker
of
any size yet,
it
can
be
carr
i
ed
easily
in
one hand.
High quality components
are
used through-
out
the equ
ipm
ent,
in
keeping with profes-
sion
al
standards.
All
normal
operating
controls for
the
amplifier
are
available
on
the
front
panel, clearly marked
as
to their function.
Connection facilities for interconnecting
the
amplifier loudspeaker with
other
equipment
are
located on
the
side panel.
The
IO-watt power amplifier is
of
push
-
pull design.
It
is a conventional high fidelity
type
of
amplifier
but
is
unusual
for
its
fast
transient
overload recovery.
In
conjunction
with the amplifier is a compensation network
which forms
an
accurate inverted image of
th
e
speaker
and
enclosure
characteristics
.
Since
the
speaker is designed to utilize
the
400301
622
AMPLIFIER
LOUDSPEAKER
boost from this network,
the
resu
lt
is
a uniform
acoustical response
that
is virtua
li
y fl
&t
from
65 to better
than
10,0
00
cycles
per
second.
622 Amplifier Loudspeaker
1
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PERFORMANCE
CHARACTERISTICS
Overall Freq
uency
Re
s
pons
e:
(
in
air)
Ampl
ifier Fre
quency
Response:
P
ower
Output
:
Signal-To-Noise
Ratio
:
Controls
and
ConnectiOns:
Equalization:
Externa
l Speaker Feed:
lnp
ta
Impedance:
Output
Imp
ed
an
ce:
P
ower
Requir
ements:
Weight
:
Dimensions:
CONNECTIONS
65
to
better
than
10,
000
cps
esse
nti
ally flat acousticall
y.
Re-
sponse
c
urv
e
es
tablished by a
test
micr
op
hon
e in
fre
e
fi
e
ld
on
axis
with
unit
radi
a
ting
int
o semi-infinite
space
of
2
-:r-
st
er
adians
so
lid
ang
le. Ac
tu
al
us
e will
approximate
t
hi
s
co
nditi
on
wh
en
the 622
is
pla
ce
d
in
a good acoustical
enviro
nm
ent. T
ests
were
mad
e
with
7
co
mpon
e
nt
multiton
es
of
quarter
oc
ta
ve width.
±0.5
db
20
to
20
,
000
c
ps
.
10
watt
s amplifier pow
er
with
no audible ha
rm
onic
dist
ort
i
on
.
Speaker
c
an
us
e full
power
.
Amplifier noi
se
(
including
hum
) is
70
db
below
rated
o
utpul.
Vo
lum
e c
ontr
ol,
ba
ss
-tr
eble
co
ntrol
,
pow
er
sw
it
ch
and
on-off
indi
ca
tor
light
are
provided.
Ca
ble for a-c
power
is
furni
shed
and
al
so
an
a-c
co
nveni
en
ce
outlet is
built
in. Audio
input
con-
n
ec
tor
is
of
the
co
n
ce
ntri
c
pin
type.
Externa
l sp
ea
k
er
co
nn
cc
•
tion is a h
ea
dph
one type
jack.
Single
co
nt
ro
l
on
front
pan
el
giv
es
a level
tilt
to
speaker
o
utput,
boosting
the
bass
a
nd
a
tt
e
nu
ati
ng
the
tr
eble
or
vice versa.
Maxi-
mum
ba
ss
boost is 6
db
relative to treble. Maxi.mum
tr
eble boosl
is
6
db
relative
to
ba
ss.
Use
of
the
ex
te
rnal
spea
ker
ja
ck
a
ut
om
atica
lly c
uts
out
thr
622's
speaker
a
nd
co
mpensation
n
etwor
k. Hence.
Aal
a
mp
l
ifl
cr
output
is fed to
th
e
externa
l speaker.
20,000 o
hm
s.
12
ohms
to
exte
rnal
spea
k
er
.
117 volts a-c,
50
or
60
cps, 0.5
amps,
55
wa
tt
s.
25
pounds.
13x 16 x 8
inches.
C
onn
ect
the
power
cable
from
th
e a-c
power
input
co
nn
ec
tor (C in
th
e Controls
and
Con-
nections
illu
s
tration
) to a
co
nv
e
ni
e
nt
117
vo
lt
a-c
power
so
ur
ce
.
Connect
th
e i
np
ut
ca
ble to
th
e INP
UT
recep
tacle (
Bin
th
e Controls
and
Connections
illu
stratio
n
).
A s
hi
eld
ed
interco
nn
ec
ting
ca
ble
is
furnished
pr
i
maril
y
for
u
se
with the
AMPEX
Mod
el
602
P
orta
bl
e T
ape
Recorder
/
Repro
-
du
ce
r. Any
other
ca
ble used
to
connect
the 622
to
other
eq
uipme
nt
should
be
of
th
e shielded
type a
nd
mu
st
h
ave
a s
tandard
phono
pin
plug
on
the e
nd
tha
t
plugs
into
th
e 622.
2
NOTE
Th
e
second
a
•c
connector
(A in the
Controls
and
Connections
illustra-
tion)
is
a
convenie
nce o
utl
et
which
may
be
used
to
furnish
power to aux-
iliary
equipmen
t.
The
convenience
o
ut
l
et
is
not
co
ntrolled by
the
power
switch,
it
is
al
ways
on.
Th
e
int
e
rn
al
speaker
of
th
e 622 is used in
normal
opera
tion.
An
exte
rn
al
speaker
m
ay
,
however,
be
plu
gged
i
nto
the
EXTERNAL
SPEAKER
jack
(G
in
the
Controls
and
Con• -
www.SteamPoweredRadio.Com
-
1111
C.
CW/fllll.lltl
Ollflll
mu
mo
tlCIPIICl!
0
0
c,
!NI lNII fVU
181
lllO
llll
·,
,,,,
~---
muo 11u
Ill
l04l
l
lllAIIOtt
Cfllrto(
i
011lOIUGIII
I
ll
mu tOllllOl
Co,ztrols and
Connec
t
io
ns
nectious
illu
s
tr
at
ion).
In
se
rtion
of
an
externa
l
spea
k
er
pl.ug au
toma
tica
ll
y
dis
co
nn
ec
ts
th
e in-
ternal
spea
ker.
Th
e
amp
lifier in the Model
622
ha
s a low ou
tp
ut
Jmp
eda
n
ce
a
nd
w
ill
op
era
te
sat
i
sfac
torily
in
to
external
sp
ea
ker
l
oad
im
ped
-
ances
of
appr
ox
imat
ely
12
ohms.
OPERATION
Once
th
e eq
ui
pme
nt
is
insta
ll
ed
or
int
er-
con
nec
ted,
ope
r
atio
n
co
nsi
sts
on
ly
of
setti
ng
the
co
ntro
ls to
ac
hiev
e
th
e desired t
ona
l va
lu
e
and
ou
tp
ut
l
eve
l.
To
ope
rat
e the e
quipmen
t, pla
ce
th
e
P
OWER
sw
itch
(I
in
the
Controls
and
Connec-
tions illu
stra
tion)
in
the
ON
position. A
ft
er
a
s
hort
warm-up
per
iod,
th
e
input
s
ignal
ca
n
be
ap
plied.
Th
en, a
dj
ust
th
e EQUA
LI
ZATION
con
tro
l (F ) and the L
EVEL
co
nt
ro
l (
D)
for
the m
os
t pl
eas
in
g r
es
ult
s.
SPEC
IAL
APPLICATIONS
Th
e M
ode
l 622
is
a
versati
le
un
it,
readi
ly
ada
pt
ab
le to a variety
of
practi
cal
applicat
i
ons.
lt
can
be
u
sed
as
a
port
a
ble
pu
bl
ic
address
system, a g
ui
tar
amplifier,
or
a re
mot
e
auxi
li-
ary
unit
for
a fixed
so
un
d
sys
t
em.
See y
our
di
s
tributor
for
advice on
th
ese
specia
l
appli
ca-
tions.
Th
e
use
of
th
e Model
622
(
in
co
njun
ct
io
n
wi
th th
e A
MP
EX
Mode
l
602
Po
rt
ab
le T
ape
Re-
cor
d
er)
as
a
po
rt
able
publi
c a
ddr
ess
syste
m is
cove
red
in
de
tail
below
as
an
examp
le
of
what
c
an
be
don
e with
thi
s
unit.
St
ep
1:
Co
nn
ec
t a
mi
cr
ophone
to
th
e
AMPE
X
port
-
able r
eco
rder
.
Step
2:
Co
nn
ect
the
r
ec
order
o
utput
to
th
e Model
622
input
.
St
ep
3:
Turn
th
e
recorder
MONI
TOl\
SELECTOR to
th
e
INPUT
position.
Step
4:
Turn
both
ma
c
hin
es
on.
Step
5:
Set the
recor
d
er
MIC R
EC
LE
V
EL
concrol
ex
act
ly
as
fo
r
makin
g a r
ecor
din
g.
Step 6:
Ad
ju
st
th
e lou
dspeaker
vo
lu
me
wi
th
the
LEVEL c
ontro
l on
th
e Model 622.
NOTE
Th
e Ml C REC LEVEL
contro
l
rm.
the
recorder will
al
so
affect
lo
ud
s
peaker
vo
lume
,
hut
it
shou
ld
no
t be
used
for
thi
s
pu
r
pose
once
it
ha.-.
been
set
as
in
Step
5.
A recording of
th
e
program
may be m
ade
s
imult
ane
ou
sly by s
im
ply
thr
ea
din
g a t
ape
on
the reco
rder
a
nd
placing
th
e m
ac
hin
e in the
r
eco
rd
mod
e.
Thi
s w
ill
not affect
th
e
pub
li
c
a
ddr
ess
operat
ion.
THEORY
OF
OPERATION
Th
e si
gna
l
from
J1
appears
at the
gr
id
of
tube
Vl
t
hrou
gh
potentiom
eter
Rl.
Pot
e
nti
om-
eter
RI
pr
ov
id
es
a
means
of
se
ttin
g LEVEL.
Bias
an
d n
ega
tive f
ee
db
ack
is attai
ned
by un-
by
pa
sse
d resistor R2.
Negative
f
ee
dback
for
t
ub
e VJ is al
so
obtained
from
the
compcnsa
l-
ing
n
etwo
rk
.
The
si
gna
l is
dir
ec
t-coupled to
the
gr
id
of
tu
be
V2a.
Tube
V2 is a
standard
se
lf
-
bal
ancing
differe
nti
al amplifier type ph
ase
i
nv
erte
r
exc
ept
that
, b
eca
u
se
of
th
e dfr
ect
c
oupling
to tu
be
V1,
th
e grid of
tub
e V2b is
ap
pr
ox
imat
ely
100
volts
posit
ive
with
r
es
p
ec
t
3
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filJIICK
TO
IIWTl'VI
IIIU
Ml
..
Cl
••
It
Cl • m
II
MTl'Vl
SIii!
cu
Simplified Schematic,
In
put
Stage
and
Pha
se
I
nve
rter
...
to d-c ground (
th
e grid is
at
a-c grou
nd
because
of
th
e low impedance
of
capacitor C2).
Th
e
tw
o outputs
of
the
phase inverter are
coupled to the grids
of
output tubes
V3
and
V4
through capacitors C4
and
C3.
The
output
stage
is
a
standard
push-pull power amplifier.
flOllftar(ISTIIL
>-1-----
"
C>
rn
"
H
1--+-----<1--
·
llNHN'fl
nut
"...__
__
__._
_.....__..
..
..
II
Sim
,plifi.ed Schematic, Power
Am
,plifier
After power amplification,
the
signal is ap-
plied to the co
mp
ensation network through
output
tran
sfo
rm
er
Tl.
The
compensation
net
-
work, which consists
of
capacitors
CS,
C9
, and
ClO
and resistors
RIS
, R16,
and
Rl7
, provides
the necessary inverted ima
ge
of
th
e speaker
and
enclosure
charac
teristics which resul
ts
in
virtually
fl
at
acoustical response.
The
com-
pensation network acts as a passive filter and
also provides feedback to tube Vl.
The
equali-
zation network, consisting
of
capacitor
Cl
1.
resistors R18, R20, and
R21
and
potentiometer
Rl9
, provides the tonal compensation desired
by the listener.
Wh
en
an
ext
ernal
speaker
is
plugged into
EXTERNAL SPEAKER
ja
ck J2,
the
compensa-
tion network
(bu
t not the feedback
or
the
4
f!Oltb.
r
I
,_n
I
JII
1,1
I
_
..
'
I
L--
••
<tolNMSAI~
•
ll(lWffO
C!t
'"
,,
U
ll
'
.l"
l
S,OJll
Simp
l
ified
Schematic, Conipensati.Oll Networh
equalization network) is bypassed providing
flat signal response
at
th
e speaker jack.
SERVICE
NOTE
S
Certain cir
cu
it c
haract
eris
ti
cs
of
the
Mod
el
622 should be understood before attempting
m
eas
urements
or
servicing. (See
Schematk
Diagram.)
1.
While
response
of
th
e
622
(
in
c
ludin
g
speaker) is acoustically '{lat. the r
es
ponse of
the
amp
lifier. measured
at
the internal
speaker terminals, is
not
flat.
The
amplifier
response is flat
only
when measured across
a 12-ohm load plugged into the EXTERNAL
SPEAKER jack.
2.
The
phase inverter,
V2,
is
of
the differ
ent
ial
type. Note, however, t
hat
the
gr
id
of
the
second section, V2b, is
at
ground potential
wit
h respect to a-c only (due to the l
ow
im
-
pedance of
C2)
and
is approximately 100
volts positive with respe
ct
to d
-c
ground.
For
service access to tubes. remove the
four
r
etai
ning screws from
the
front panel
of
the
amplifier. For access to
und
er-c
ha
ssis parts. r
e-
move
th
e screws
at
the forward edge~
of
th
e
amplifier chassis. and pull
th
e front panel for•
ward and down.
No
attempt should
be
made to service the
speaker.
or
to remove
it
from
the
case.
1f
servicing
is
required during the warranty
per
i
od
,
return
the
entire Model 622 to
yo
ur
nearest
AMPEX
dealer
or
authorized service
center.
www.SteamPoweredRadio.Com
-
-400007
REF
.
NO
.
Cl
CZ
C4
cs
C6
C7
ca
C9
Cl0
Cll
Cl2
Fl
I-1
Jl
JZ
J3
J4
Rl
RZ
R3
R4
RS
R6
R?
R8
R9
R 10
Rl
1
Rl2
Rl3
Rl4
Rl
S
Rl6
Rl?
R18
Rl9
RZ0
RZl
RZZ.
R23
PART
DESCRIPTION AMPEX
PART
NO
.
CAPACITOR,
Fixed:
disc;
•
02
uf;
500
vdcw
CAPACITOR,
Fixed:
tubular
paper;
.047
uf;
400
vdcw
(Same
as
CZ)
(Same
all
CZ)
CAPACITOR,
Fi.xed:
electrolyt
i
c;
4,
10,
20,
and
40
uf;
400,
45
0,
450
vd
cw
CAPACITOR,
Fixed:
tubular
electrolytic;
25
u!;
25
vdcw
CAPACITOR,
Fixed:
tubular
paper;
•
033
uf;
200
vdcw
CAPACITOR,
Fixed:
tubular
paper;
•
12
u!;
ZOO
vdcw
CAPACITOR,
Mi
c
a:
50
uuf
(Same
as
C8)
CAPACITOR,
Fixed:
disc;
•
00015
mfd;
500
vdcw
FUSE:
1. 5
amp;
250
V;
Type
3AG
LAMP:
G.
E.
Part
No.
47
JACK:
phonu
receptacle
JACK:
phono
Switch
Cra!t
No.
SF-25
CONNECTOR,
Receptacle:
female;
l.
contac
t
CONNECTOR,
Receptacle:
male;
Z
contact
R
ESISTOR.
Variable
:
250K
log
taper
volume
control
RESISTOR,
Fi
xed:
co
mposition;
750
ohms1
1/
2.
watt;
5%
RESISTOR,
Fixed:
composition
;
l.
5 m
-,
g;
1/Zwat
t;
I0o/o
(Sarne
as
R3)
RESI
S
TOR,
Fixed:
composition
;
220K;
1/
2
watt;
10"/o
RESISTOR,
Fixed:
composition;
Bt.K;
l/
t.
w.itt;
JOo/o
RESISTOR,
fixed:
compositlon;
39K;
1/t.
watt;
54-00IJ
54
-
0003
54-0003
54-0003
55
-
0013
55
-0
007
54
-
0014
54-0012.
54-0014
54
-
0029
61-
0003
61-
0002
63-0019
63-0018
63
-
0005
64-0001
52-0119
5
1-
0041
51-0042
'il-00
4
.'.
SJ-00.l0
51-0036
10%
5
1-001
9
RESISTOR,
Flxed:
composition;
l0OK;
1/
l.
watt;
l
0o/o
51
-
0037
RE
Sts
TOR,
Fixed:
c
omposition;
HOK;
1/
t.
watt;
10%
51-0038
RESlSTOR,
Fixed:
composttlon;
l70K;
1/
t.
w:itt;
10%
5
1-
00
40
(Same
as
R
10)
51-0040
RESISTOR,
Fixeq:
compoeitlon
;
27K;
1/2
watt;
10%
51
-
00
44
RESI
STO
R,
Fixed:
wlre.wo
und;
3
60
obms;
5
watts;
5%
RE
SlSTO
R,
Fixed:
composltion;
l.
SKI l
watts;
10%
RESISTOR,
Flxed:
compos
itlon;
I
SK;
1/
2
watt;
10%
(Same
as
R
9)
RESISTOR,
Fixed:
c
omposition;
56
ohms;
1/
Z.
,.,att;
10%
RESl
STO
R,
Fixed:
compo
slt
lon
;
470
ohms
;
l/
2
wa
tt;
1
0"/A
RESlSTOR,
Fixed:
composition;
IK:
line
ar l
a.per
ton
e
control
RESISTOR,
Fixed
:
composition;
3,
'JK,
1/
2
watt;
5
1-
00
46
5
1-0045
'i
l-00
50
51-003&
5
1-0043
51-0047
Sl-0008-01
10%
51-0048
(Same
as
Rl8)
5
1-0047
(Same
as
RIO)
51
-
0040
RE
SISTO
R,
Flxed:
composltton;
1.
7K
ohm;
1/
2
watt;
1
0%
51-000
1
s 6
www.SteamPoweredRadio.Com
-
REF
.
NO
.
51
Tl
'
1'
/.
Vl
V2
V3
V4
V5
PART
DESCRIPTION
S
WITCH,
Power
TRAN
S
FORMER,
Output
TRANSFORMER,
Powe
r
VACUUM
TUBE
~
EF86
VACUUM
TUB£
:
12AU7
VACUUM
TUB
E:
6V6
GT
(Same
as
V
3)
VACUUM
TUBE: 6AXSGT
POWER
CORD
HEAT
S
HIELD
INPUT
CABLE
*
SPE
AKER
ASSEMBLY
FUS
E
POST
*A
va
U
able
only
as
a
replacement
part
for
the
M
odel
622.
This
speaker
assembly
will
not
!un
c
tion
pr
ope
rl
y
wh
en
associated
wlth
any
other
ampluler.
AMPEX
PART
NO
.
62-0007
58-0005-01
58-000
4-
01
56-00
I0
56-000!.
56-0009
56-0009
56-0008
73-0004-03
29
-0006-
0l
473-0003-50
68-0101
- 01
63-0015
www.SteamPoweredRadio.Com
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622
A.mplif~r
7 8
www.SteamPoweredRadio.Com
AMPEX PROFESSIONAC AUDIO EQUIPMENT
ONE
YEAR
WARRANT¥
Congratulation,;
and
thanks
. You nou·
01m
thf' finest tnslrum('nt
of
its
k
in
d in the
world
today.
T
his
f'QUip
-
ment
mcrts
stllfl.dards
of
performance,
durability
and
rcliabil1t'.I,'
th
at
surJ)(JSs
anything
tn
its
market.
The
u·arranty
cot•ering thtS eq11ipm('n/
is
1,a/uabl"
to
you
.
Thill warrant11
i,
effective when
tla
e warront11•
r~i•tration
card
i, fullll
and
pro,,erl11 filled
and
ret11r
Md
to
th
e
fa
cto
ry
witllin
ten
(
10
)
da11•
of <klioer
11
.
Before
your
unit
left
the
factory,
:ill
phases
of
its
performance
were
carefully
checked by
sensitive
test
instrum
en
ts.
This
individual
Ampex
unit
equalled
or
exceeded
all
current
specifications
fo1•
its
model.
Hence, i.f
properly
used,
it
should
meet
your
most
exacting
requirements.
Should you
experience
difficulty iri
the
operation
of
this
equipmenL
or
should
servicing
of
any kind
be
necessary,
please
contact
the
distributor
from
whom
it
was
purchased.
Ampex
reserves
the
right
to
modify
or
change
the
equipment,
in
whole
or
in
part,
at
any
time
prior
to
delivery
thereof,
in
order
to
include
therein
electrical
or
mechanical
refinements
deemed
appro-
priate
by Ampex,
but
without
incurring
any liability
to
modify
or
change
any equipment previously
delivered,
or
to
supply new equipment
in
accordance
with
earlier
specilications.
Ampelt
warrants
to
the
original
u.alng purcha&er
that
All
new
Professional
Au.dloEqulpment
shall
be
free
from
dcfecta
in
workmanahlp and
material
und<:r
normal
and
proper
u.se
and
service
for
a
period
of
one
year
from
date
of
delivery
to
origin&!
using
purcbao;er :ind
agruca
to
repalr
or
replace
aU
parts
(except
tube11,
translators,
diodes, luaes,
lamps
and
tape)
thereof
ahowtng
auch
defects;
subject
lo
all
or
the
follO\Ving
provl1ioos.
A
■
,u
Wa
rr111ty
0~ipt111
(a)
Pa
rts
ret1r1t
l
wl011
D-9
1
Day$
Ir••
0,1,
E
111
,
■
11t
Otli
un
d
to
Ort
1
iul
U
s111
P
1rc,ner
-A
ll
au.ch
deCecllve
parts
will
t>e
repaired
or
replaced
at
no
chllrgc
Cor
labor
or
ma-
t.erials;
{d)
ImrpecUon
ehall
di11CI06l'
to
Ampex'•
satlsf11etlon
th11t
tho
dt>fact11
are
as
abO\ie
specified
and
that
the
e<r,1l1>-
ment
hllJI
not
be<?n
:ilu:-red
or
l't'paired
bv
other
than
(Jctory
approved procedures,
IUhJecLCd
toneaUgence,
mlBUsu
or
accident,
or
dam
aged
by
cxc~ssive
current
or
other,vlse,
or
bad
lta aerial
number
or
nny
part
thereof
altered.
defaced
or
removed.
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