TV Receiver User Manual
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RCA-2CW4, 6CW4, 13CW4
High-Mu
Nuvistor
Triodes
RCA-2CW4,
6CW4,
and
13CW4
are
high-mu
triodes
of
the
nuvistor
type,
intended
for
use
as
grounded-cathode,
neutralized
rf-amplifier
tubes.
The
2CW4
and
6CW4
are
particularly
useful
in
vhf
tuners
of
television
and
FM
receIvers.
The
13CW4
is
designed
especially
for
use
in
antennaplex
and
antenna-system
booster
amplifiers.
In
these
applications
the
tubes
provide
exceptional
performance
in
fringe
areas
and
other
locations
where
signal
levels
are
extremely
weak.
These
nuvistor
triodes
feature
excellent
signal
power
gain
and
a
noise
factor
significantly
better
than
tubes
currently
in
use
in
such
applications.
•
The
high-gain
and
low-noise
capabilities
of
these
tubes
are
achieved
by
very
high
transconductance
and
excellent
transcon-
ductance-to-plate-current
ratio
(12500
micromhos
at
a
plate
current
of
7.2
milliamperes
and
a
plate
voltage
of
70
volts).
The
2CW4,
6CW4,
and
13CW4
nuvistor
triodes,
because
of
their
unique
design,
offer
these
additional
advantages:
extreme
reliability;
exceptional
uniformity
of
characteristics
from
tube
to
tube;
very
small
size;
and
low
heater-power
and
plate-power
requirements.
All
metal-and-ceramic
con-
struction
insures
ruggedness
and
long-term
stability.
These
nuvistors
utilize
the
RCA
Dark
Heater
to
insure
long
life
and
dependable
performance.
The
heater
of
the
2CW4
has
controlled
warm-up
time
for
use
in
series
heater-string
arrangements.
GENERAL
DATA
•
Elect
r i
ca
1:
Heater,
for
Unipotential
Cathode:
2CW4
6CW4
13CW4
Voltage
lac
or
de).
2.1
6.3
±
10%
13.5±10%
volts
Current.
0.45
±6%
0.135
0.060
amp
Warm-up Time
(Average).
8
seconds
Direct
Interelectrode
Capacitances
(Approx.):
Grid
to
plate
.
0.92
pf
Grid
to
cathode,
shell,
and
heater.
4.3
pf
Plate
to
cathode,
shell,
and
heater
1.8
pf
Plate
to
cathode.
0.18
pf
Heater
to
cathode
1.6
pf
Characteristics,
Class
AI Ampl
ifier:
Plate
Supply
Voltage.
110
volts
Grid
Supply
Voltage.
0
volts
Cathode
Resistor.
130
ohms
Amplification
Factor.
65
Plate
Resistance
(Approx.).
6600
ohms
Transconductance.
9800
f-lmhos
Plate
Current
.
7
ma
Grid
Voltage
(Approx.)
for
plate
current
= 10
fLa.
-4
volts
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