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Heathkit TT-1 - Page 9

Heathkit TT-1
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In
order
to
list
the
greatest
number
of
tube
types
on
a
roll
chart
that
is
necessarily
limited
in
size,
abbreviations
must
be
used
to
indicate
control
settings,
procedures,
etc.
An
explana-
tion
of
these
abbreviations
is
given
below:
TYPE
SELECTORS
ny
rd
REMARKS
List
the
tube
according
to
the
EIA
(RETMA)
numher
\avead
ew
avesay
AUS
mcer.
Setting
of
the
BIAS
control
and
BIAS
RANGE
switch.
Example:
A
setting
of
20
L
means
that
the
BIAS
control
is
to
be
set
at
20
and
the
BIAS
RANGE
switch
is
to
be
setto
the
L
(low)
position.
Setting
of
the
FILAMENT
switch,
Setting
of
the
ME
tivity)
control.
Setting
of
the
SIGNAL
switch.
NOTE:
The
Gm
scale
read-
ing
is
not
multiplied
by
the
setting
of
this
switch.
Settings
of
each
of
the
nine
SELECTOR
switches,
read-
ing
from
left
to
eiaht
wy
ah
Weed
awa’
ad
e
fat
=
Seta
}
v¥
the
two
rows
separated
b
Aaah
Uda
Sn.
This
is
the
Reject
Point,
or
the
value
of
the
meter
read-
ing
at
or
below
which
the
tube
being
tested
should
be
re-
jected.
Any
information
pertaining
to
testing
of
the
tube.
HEATHKIT
TT-1TUBE
TESTER
No
Leak
Check
Do
not
rotate
LEAKAGE
Leak
On
rd
oO
Tr
Pl
and
P2
G1
and
G2
K1
and
K2
Ose
Whole
Tube
Reg
Firing
Lim
switch
through
positions
1,
2,
3,
4
or
5.
A
short
circuit
will
be
indi-
cated
on
meter
for
the
posi.
tions
of
the
LEAKAGE
switch
following
this
abbreviation
Pentode
section
of
tube
is
tested.
Triode
section
of
tube
is
being
tested.
Tube
shall
be
tested
with
switch
P
in
both
Pl
and
P2
positions.
Tube
shall
be
tested
with
1
i
1
Gin
co
switch
G
in
both
G
positions.
a
Q
i)
an
Tube
shall
be
tested
with
switch
K
in
both
Ki
and
K2
positions.
NOTE:
Where
the
''2"
posi-
tions
of
two
or
more
of
the
K,
P
or
G
switches
is
called
for,
it
is
recommended
that
they
be
pulled
down
simul-
taneously.
Unless
otherwise
stated,
these
switches
must
1208
Waves
eS
Esse
h
be
in
‘the
K1,
Pi
and
Gi
po-
z
Bee
mabian
At
dec
sillator
section
of
tub
ci
s
being
tested.
oO
Specifies
that
all
elements
in
tube
are
being
tested
si-
multaneously.
Shows
by
how
many
volts
a
regulator
tube
can
vary
on
the
"VR
TEST
VOLTS"
scale.
The
range
of
voltage
fol-
lowing
this
abbreviation
in-
dicates
the
firing
limits
of
the
tube
under
test.
Page
9

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