GULBRANSEN E - Rattles, Buzzes, and Vibrations; Standing Waves; Key Failure Troubleshooting; External Accessories

RATTI.ES,
BUZZES,
AND
VIBRATIONS
When
playing
the
organ
at considerable
volume
a
great
d€l
of
a.oustical
power
is
p.oduced,
parricular-
ly
*hen
playing
pedal
not€s.
Becaus€
of
the sustained
nature
of
orsan
tones
condiiions
may
b€
such that
sympatbetic
vibrations
are
set up.
This
can
result
in rat
es or
buzzes
which
are very
annoyins.
Sornetines
these
raftles
are
due to
a
parr
in
the
organ case
vibrating,
but very
frequenfly
they
are due
to
somethins
aparr
from
rhe o.san.
Especia
y
likely
to be
"srilty"
are doors,
windows,
venetran
blinds
and Iight
tixtures.
As
for the
orsan
itself,
ure
front
panel
can
some_
tiDes vibraie
if
it is
nor
sc.ewed
in
properly
and
iightly.
It is
very ihportant
rhat
this
front
pancr
De
tisht since
the operatjon
of
the loud
speaker enclGure
demands
an
almost
airtishi
condition.
Be
careful,
too,
lo ahays
replace
any hardware
that is
loosened.
STANDING
WAVES
Because
of th€
)ons wave
tensth
ot the tow
pitch
notes,
thes€
tones are
reflected
from the walls
and
ceiling
in such
a way that
certain
,ones lrill be
loud
at
som€
parts
of the
room
and soft
ar others. This
is
a natural
phenomenon
tbat takes
ptace
regardless
of
ho',
tones
are
produced.
If a
siven
note
.,cancets
out',
at a
point
where
the organists
ear happ€ns to
be, it
can be
very annoying.
The
only
cure is
to move
tne
organ
a few
f€et
so thai the
.,standirg
wave',
pattern
is
altered.
SHOUI.D
A
KEY FA|I.
TO PLAY
If any
individual
key
fails to
operate it is
probably
b€cause
a
piece
ofdust
or
di.t Ms lodged
on the bus
bar. This
is
easily cteared
by
simply holdins
dom
the key
in
question
while operatins
the srop
tablet
on md
off a number
of times.
This causes
a f.iction
o. rubbins
action
that will
clean
rhe contact.
In a
new orsan
an
occasronal
contact
may
be
.,dirty"
due
to the
deposit
on the
bus bar
of a
smal
quantiiy
of
rcsjn as
a rdult
of
the solderins process
used in
assembly.
These
contacts
are easily
cleaned
as
p€.
above
and once
cleaned
will
nor
give
houble.
EXTERNAL
OR ADDITIONAL
SPEAKER
CABINETS
The
Model
E Gulbransen
Oryan
is
so
desisned
thar
in
normal
home
usase
the volume
is srlfficient.
When
the organ
ie used
in
a largo
room
or
where
g.eaier
power
or
sreaier
tonal
dispersion
is
required,
it
js
so
d$isned
that it
may
be used
in
conjuncrion
wtth
one
or
mo.e
Leslie
Speaker
Cabinet!.
Lesiie
O.san
Speaker
Cabiners
a.e
manufacrure.t
by Elect.o,Music,
313
Sourh Fair
Oaks,
pas.ldena
I,
Caljfonia,
and
rlay
be
obtained
from
your
l.)cal
Gulbmnsen
orsan
dealer.
Iaslie
cabinets
have
a mor€
elaborate
tremolo
sys-
tem
than
that emptoyed
jn
rhe
orsan. T1{o
.oarms
homs
prcduce
an
enomousty
comptex
and satisfying
tone
quality
that
is hishty
d€si.able
ev€n where
hish
power
ts required.
Also,
many
interesting
effects
arc
possible
by usins
the Inslie
Speaker
Cabinet
and rhe
built-jn
speaker
in
combinarion.
For exampte,
they
@n
bc used
with
tremolo
on
one sp€aker
ano
nor
on
the other,
or
very
quick
chanses
can
be made
trom
the
"t.emolo
on"
speaker
ro rhe..tremolo
off,,speaker.
Cohplete
parts
and
instructions
for
connecting
the
Irslie
Model 145
or 147
Orsan
speaker
are supptied
with
each
speaker
€binet
and
rhe insrallation
is a
very simple
matt€r
that
can b€
done
by
your
dealer
in
just
a few minutes.
Ask
your
deater
to dernonstrat€
the
Iaslie
Speaker
used
in conjunction
wfth
the
Gulbransen
Transistor
Orsan.
Accessories
tl