Ampex 351 Series - PERFORMANCE CALIBRATION

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the
rel
ay
energized.
When
th
e
STOP
button
on
the tape
transport
is
pr
es
sed
, the 115 volt
d-c no
lon
ger
reach
es pin 3
of
5J7
a
nd
relay
3Kl is de-energized a
nd
dr
ops
out.
Sl
ave
elec-
tro
nics
re
l
ay
4K3 provid
es
a
co
up
l
ing
co
nta
ct,
4K3A,
when
b
oth
electronics
arc in
th
e reco
rd
mode
(c
on
c
urr
ent
reco
rdin
g).
Th
is
re
l
ay
re-
m
ains
energized for a s
hort
time
after
th
e
seco
nd
rel
ay
3
Kl
is de-energized to mai
ntain
oscillator
co
up
ling
durin
g
th
e
d
ecay
perfod
of
th
e osci
llat
ors.
NOTE
ln c
atalog
numb
ers
,'30950
and
30960
slave
electro
ni
cs,
r
elay
4K3A
co
ntac/.s
serve
as
inlercon11ec
ti
o11
bet
wee
n
t'1
C'
ma
ste
r
and
sl
ave
osc
illators. Catalog
11u111b
cr
30750
s
la
ve
elec
tr
o
nics
did
11
ot
ha
ve
re
lay
4K3.
CAUTION
B
efo
re
performing
a/ig
nm
e
nl
uncl
perfo
rman
ce
c
/1
ec
ks on
st
ereophonic
equ
ipmen
t
see
special uotes
on
ali
_
q11
-
ing
stereop
h
onic
eq
11
i7m1e11
t.
ALIGNMENT
AND
PERFORMANCE
CHECKS
Equi
pm
ent Required:
Amp
ex
Standard
A
Ji
g
nm
e
nt
Inch Tape.
T
apes
for
¼
Speed
3¾
in
ches
per
secon
d (ips)
7½
in
ch
es
per
second
(ips)
15
in
ch
es
per
sec
ond
(
NAB
)
15
in
ch
es
per
seco
nd
(AME)
NII
mh
('r
Amp
ex
Catalog
3 1
33
1-
01
31
32
1-
01
31311
-01
313
12-01
A
-c
V
ac
uum
Tub
e Vol
tm
eter
capa
bl
e
of
indi
-
c
atin
g
rms
volt
ages
of
.004
or
l
ess.
J\udio O
sc
ill
ator
with
sta
ble o
utput
from
50
c
ps
to
15
kc.
Earphones
or
Speaker
for
A
ur
al
l\
f
on
it
or
i
ng
.
Nutdri
vc
r,
numb
er
8 ( •;
.,
in
ch ) .
Reel of
unr
eco
rd
ed t
ape.
Long
Screw
dri
ver
(a
pproximate
lv 7
in
ch
bit
).
Small Sc
rewdri
ve
r .
Re
produc
e Al
ig
nm
e
nt
:
Step
1:
Re
mo
ve
the
h
ead
cover.
Step
2:
Wit
h
the
equ
ipme
nt
co
nn
ec
ted
as
STANDARD
TAPE
S
Orde
r
3%
ips
7½
ip
,s
J
5
ip,
of
Tone
Ton
e
Tm
w
R
ecording
(c
pi;
)
Levt!l
F
nn
ctio11
(c
pi.)
L
ev
el
F1mr1
ic111
(c
ps
)
Level
F1wrti
o
11
Fir
st
T
one
500
10
db
re
produce
700
-10
dh
reproduce
700
opera
tin
g
reproduce
reference
re
ference
gain
cali
br
ati
on
&
reference
Second
Tone
7500
10
db
reproduce
15,
000
JO
db
reproduce
15,000
operating
r
eprod
u
ce
h
ead
head
h
ead
a
li
g
nment
alignmen
t
a
lignm
ent
Se
ri
es
of
7500
10
db
ch
eck
15,
000
- JO
db
check
1
5,000
operating
ch
eck
Ton
es
to
frequency
to
frequency
to
frequen
cy
50
response
"'
30
response•
30
respon
se•
L
ast
T
one
500
opera
tin
g
re
produce
700
op
erati
ng
reproduce
gain
ga
in
NOT
USED
calibra
t
ion
calib
r
ation
•
Adjust
hi
gh
frequency
eq
u
alizers
if
nece
ssa
ry
7-6