VTL ST-15, ST-150 Owner's Manual
Makinqmbes
vLserjrienb[y
HANOCRAFTEO
IN THE
USA
\TTL
ST-150 Stereo Power
Amplifuer
f:able
of
Gontents
CHAPTER
I
Water
and
fufoisture...
Location
and
Venti
lati
ort
I
I
I
Sen,icing
Operarionot
wonni:ng;.
...... .
...
CHAPTER
2
Gprrnc
Srnnrrp
...........3
Unpacking
the ST-150
from
its
box.
......
3
The
S'f-150
Front
Panel
....--.---4
Check
for
tube
placement
....'..........-.-.4
ST-150 Back
Panel....
.....-.....
J
Connecting
Your Amplif
er to
your svstem...
.........-.-.
5
Voltage Setting
..-...6
Power
Source
for
-your
Atnplrfier
.........-
6
CHAPTER
3
OpsnnrrNc
rr-rE AvpltptpR
Powering
your s.ystenr
on....
Ground Loop
Hutrr..
Powering
the
system
off.........
.-.....8
Bias
Checking
and Setting....
.......8
Top
view and
Bias
Measurenent
points
of the ST-150
Amplifier..
...-.....
.
l0
2
3
7
7
7
Cnnp
AND
MAINTENANCE
ot'- YouR
WL AupLIFIER.....
Bnrex IN
Ppntoo
Power-on
Period.
Tube Type.t......
Tube Life
Ohanging
Tubes..
Changing
the AC
and B+
Iiuses
Cleaning.
il
u
il
t1
I1
n
t2
t3
I3
I4
15
t5
ST-{50
Owney's Manual
VTL
CHAPTER
6.........
.-...
16
WannaNrY......
......
16
APPENDD(..........
...-..l7
Warranty Registratiot't
.......
... 17
Sen,ice ltlotes.
......
I
7
ST-150
Owney's Manual
VTL
tl
CHAPTER
1
lntroduction
Corryratuhtions
onlourpurchase
of
the
VTL
ST-150
Stereo
Power.4nrplifer.
wrth the
he
ST-150
Stereo
Amplifier,
a
150
watts
per
charurel
amplifier,
is designed
to
deliver a-n
involving and
tnre-to-live
listerring
experience
to yoLr.
Prope
r
care and
maintenance
of
the ST-7
50
u,'ill
assure
its
la-sti1g
value zurd
.na-*i*um
perforrnance.
Plea-se take
a
moment
to
read
through
dris
owrlels
manr'ral
arrd
please
take
time
to
get
familiar
with
the
features of
tlls
producg
so
that you
can become
fanitar
opeiatilg
a1d
maint.,',rl..
procedures
needed
for
the
ST-150.
After yotr
have
ftiished
reading
dus
Ulltrerand
Moisfuirc
T5e amplifier
should
not be
trsed
close
to any
water
or
rnoishrre sources.
If liquid enters
the amplifier
it must
be
immediately
urplugged
and
retumed
to your
dealer
for servicing.
If
this occurs
you
should
turder
no
circtrmstalces
try to po*..
the
turit
on before
the
tuit
has
been propedy
serviced
by
a trained
repair
technicia-n
-
tlrere
arc
ltaz.a1dotrs
voltages
preserlt
in this urit
that
czur cause
se
dotrs uriury
if
they
come
in
corltact
with you.
ST-150
Owner's
Manual
VTL
mantral plcase
keep
it
in a safe place
for ftrhrre
referetrce'
T6e
VTL team
is protrd
that
you
have
selected
the
ST-150
power
amphfien
as a
rlew member
of
your
home
atrdio
a'd
horle il-rcater
system.
We
sincerely
hope drat
tl're
VTL ST-150
will
contribr,rte
torvards
yotrr
enjoy'r-nent
oFmtrsic
md
give
yoLl
mally
hotrn of
listeningpleasure.
Slrmbol
Gornrentions
used
in this
guide
Certan
$.'rnbols
are
trsed
For
yotrr
owrr
safety
and
s).'rntlols.
The
'Van*tg
-
Pay partictrlar
Attentiotr"
synbol
used
is
and
the
'lWanring
-
Observe
T'hese
Precautions
For
Yottr Safety''
is
Elec{rbal
SaffiVNotbe
Electrical
voltage
From
power
cables
is hazardotn.
We recolrunelld
drat
be
used
wrth a
propedy
groturded
otrdet.
To
prevent
electdcal
shock
do
arnplifier,
especially
v4rile
the
turit
is
powcred
on.
ur tlus
owler's
manual to
draw your
attenrion
to
intportant
pourts
beurg
discussed.
that
of
your
equipment
you
should
note
and
heed
dre
wanrings
drat
Follow dlese
CAUTION
RISK OF ELECTRIC
SHOCK
dre
power
cord
comected
to
dris
uiit
not
remove ally
oF dre
covers
of th,rs
CAUTION
RISK OF
ELECMC
SHOCK
CALJTION
RISK OF ETECMIC
SHOCK
Locatbn
and
Ventilation
llstall this amphfier
in a locadon
wluch
is stable
and
rvell
vendiated.
if
dre amplifier
is
placed
in a
built-i1
ilstallation,
erlsure that
there
is
adeqtrate
room
for
a strpply
of air to
flow drrotrgh the
ventilation operrings.
Allow at
least 9
inches
clearance
on dre top
atd
arolurd dle
sides
of the
amplifie
r. Be
sure
the arnplifier
is at
least
10
urches away
From
your preamplifier
to preverlt
possible
noise
introductior-r
Lrto
yorlr
system.
Tiptoes or
other
isolation
accessodes
may
prove
trsefi.rl
in reducing
mechaical
vibrations.
Do
not place amplifiers
directly
on
high
pile
carpets as
this
will block
the
ventilation
vents.
Do not place the
amplifier
next to
heat
sources
such
as
radiators, stoves
or other
appliances.
Do
not
place ampllfier
on the
floor u,4rere
small
children
can tamper
wrdr the
equipment.
If it is
not
possible
to place
amplifier out
oF the
reach
of
srnall
children
it is
recommended
drat you
remove power
cables when dre
equipment
is not in use.
Selbltg
Do
not
attempt
to service the
amplifier
beyond
the
procedtrres
described
ur
dris
manual.
For
all other service
and questions,
plea-se
contact yotrr
atrthorized
VTL dealer
or the
factory.
Operational
VUamtEF
-
Do
not
touch ttre tubes
after
the arnplifier
is
turned
on.
Tubes can get
ve
ry
hot
while the ampLfiers
are
operating.
Tunr
offthe amplifier
and
allow dre
tubes
to
cool dowr before
attempdtg
to work
u,ith the tubes.
-
Do not attempt to disassemble
the amplifisl
ghassis
or
rernove
any covers
from
fttg
amplifier.
Always
constrlt
with y'our
VTL authorized
dealer
or the
VTL factory support
department beFore
attempting
arty service
work ort atly
VTL
ruilt.
t
Always corurect yotrr
lotrdspeaker to
the amplifier
before porvedng
dre urilt
on.
Operahng
ary
VTL
power
amplifiers
u,ithout a speaker
load cornected
can
damage dre
ouptrt transfonner,
artd
u,'ill
not
be covered
turder the
warranty.
Also, ensrlre drat
no
spealier
cables car become
loose dumrguse artd that
there are
tlo
interrnittent
farrlts
wrth the
cables.
-
Tube amph6ers can be
heavy
and arvlsvard
to
tift, widr dre
rveight urevenly
drstnbuted, and you
should
rlot
attempt to
move
the
urit
widrout
help.
Each uit of
the ST-150 Stereo
weighs approximately
58
lbs
(%.4Ks)
Do not
attempt to
make or break arly
corxlections
to
dre amphfier
w4rile
the turit
is
porvered
or1 as dris
can
damage the amplifi er utdf
or the
rest of the
system, and dls
damage
is not
cove
red
by
warranty.
If
dris
tuiltl'ra-s tetrode/triode
su,itcl-r,
do
not flrp dre triode
tetrode su'itches
while dre turit
is
powered
on,
a-s this
can damage dre switch
and
is not
covered
turder
warraltty.
-
Do not
exceed
frrse ratings
or
attempt
to bypa-ss
arly
6lses,
a^s this ctut caLrse arl
extrentely
hazardotrs
condition a-nd
will void any
warrantees. Llse
only
dre sanle t)?e
and
rating
of
frrses as specified
ur
thc
owrers
mantral zurd
marked
on
the turit.
CAUTION
R6(
O.
Et€Cm(]
y<fci
CAUTION
R6K OF ELECU?|C
SUCC(
A
A
ffi#,H.Lt?Si
ST-1
50 Ownsy's
Manual
VTL
GHAPTER
2
GetfngStatted
Unpacklrg
fte
ST-150
from
its
bot(
The
ST-150
Stereos
are
shipped
in
cartons
and
wrapped
in
thick
plastic.
The plastic
is not strong
errough to
sgpport
the
turit,
and
may tearif
you
try
to
lift
the
turit out
o[the
box
with
it. Also
there
are protnrding
swiiches
which
could
break
if the tuilt
is not propedy
handled, and
in
addition
to
the awkward,
turbalanced
hear,ry
load the
urit
has a cleaning
polish
on
it
which
makes
it
slippery
and
hard
to
grasp.
We
have
found
that
the
best
way to
rernove the
amplifier
from the box
is
as
Follows:
1. Wth the
box
on a
thick
carpeted
floor,
fold
back all
the
flaps
of the
top of
the
carton,
leaving
all
the
packing
foam
in
place.
Roll the
carton
orlto one
long
side
on top
ofdre
flap.
2. Roll the
box once
more onto
the open
top
artd,
makiltg sure that
notre
of
the
flaps
is
trapped
under the
carton.
hft the
carton
off the
tuilt.
3.
UFt the top
foam
away
from tl're
trpside
dowrr urit
and
careftrlly
ctrt
away
the plastic
from
aroturd
dre ampl-i6er.
4. Uft the amplifier
up
a:rd
away
from the packagurg
eidrer by
holding onto the
metal
ha.ndles on
the
front
of
the
rurit or
by
rolling
the
turit
onto a short
side
and dren
again so
drat
it lands on
it.s
Fotrr nrbber
feet.
Then
Iift av,tay
the packaging
and
set all
dre packaging
in dre carton.
5. When
lifting the
turit be
sure
to only
hft
it from
dre botom
turder the
transfonners.
Be careful
not
to
break
any
suritches.
Be sure to
only
set the amplifier
dor.rnr
on
its
bottom
side
on the
four
nrbber
feet on a
stable
strrface.
Setturg
it
on
any other
side
may damage
protnrdirlg
components.
If
the
turit
is
too
hear,ry or too
awkward
to
hft
then
do
not
attempt
to
do tlns
by younelF,
but
radrer
furd
someotre
to
help
you.
Save
the
carton
zurd all
packagurg
for
any
fi.rture shipment
of the
arnpli6en.
ST-150
Owney's
Manual
VTL
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