RCA 6cw4 schematic

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AN-191
RCA
This 2CW4 vhf an
turret
data
Design
nuvistor cylindrical
base
which
used
nuvistor
television
experimental
tuner,
and
Features
The
wafers.
extend
as
6CW4
Note
practical
6CW4
design,
acti
the
external
and
in
VHF
describes
triodes
tuners.
neutralized
and
as
the
and
The
2CW4
RF
Television Tuners
high-frequency
their
performance
grid-drive
and a production-type
circuit
of
the
2CW4
featuring
ve
elements
Each
element
through
considerations
6CW4
are
high-mu,
extremely
is
the
ceramic
and
of
the
supported
connector,
Ampli'fiers
performance
application
of
amplifier
switch
2CW4
high-transconductance
small
tubes
are by a
base
as
wafer.
shown
these
tuner.
are
size
mounted
tripod
in
as
also
the
rf-amplifier
tubes
circuit,
Optimum
presented.
and
light coaxial! arrangement
One
lead
bottom
Triodes
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Pos,4<h :U
of
the
6CW4 tubes
is
evaluated
an
experimental
noise-factor
triodes
weight.
y on
of
each
view
ceramic
of
of
Fig.l.
of
leads
set
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lel.
and
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the
The
is
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alllburg
8222
Fig.i-Bottolll
arrangement
6CW4
Sections
lugs
for the
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1961
All
Ri;htl
Printed
for the use
of a tube
by
RadIo
ReleNed
in
U.5.....
tube
and
of
the
socket
leads
COfporglion
view
for
2CW4.
shel1
insertion.
and
shield
of
Americo
of
pin
the
which
extend
ground
unnecessary.
ELECTRON
RADIO CORPORATION
These
the
OF
BOT
TOW VIEW
SMALL
..
0
LARGE
beyond
indexing
metal
TUBE
DIVISION
AMERICA,
HARIUSON. NEW JERSn
LUG
0
2
0
'0
0
LUG
the
shell
7
base
lugs
through
wafer
also
NOTE:
DO
NOT USE. PIN
CLOSE
serve
provide
the
socket,
PIN
I:
PLATE
PIN
z:
SEE
PIN PIN
PIN
PIN
PIN PIN PIN PIN
PIN
PIN 12: HEATER
INTERNAL CONNECTION.
TO
NOTE
3:
PLATE
4:
~E
~:
GRID
&:
GRID
7:
CATHOOE
6:
SEE
NoTE
~:
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NOTE
10: HEATER
IP
OMITTED
CERAMIC
as
indexing
NOTE
15
wArEA.
CUT
or,
protection
making
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Re"iltered
R:egi,trod<l(t)
=====~=====
Several
design
used
with a high
transfer
important
in
these
transconductance-to-plate-current
characteristics
with a considerable
advantages
tubes.
in
reduction
40000
For
Fig.2.
of
are
example,
These
both
plate-input
inherent
high
transconductance
characteristics
"~
~
in
the
ratio,
and
heater-input
60
~
70
"
g
u
60
~
~
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50
U
"
-'
40
~
<
30
20000
unique
as
shown
are
nuvistor
is
obtained
achieved
by
the
power.
Interelectrode
miniature
during
from
As a result,
larly
The
noise
tube
The
suitable
high
factor.
assembly
small
indicate
having
ments
equi
approximate
"
~
30000
I
"C.
-=-
w
U
~
20000
i;;
"
~
w
\'
et
10000
Fig.2 -Average
capacitances
triodes.
permits
to
tube,
tubes
size
for
o
In
especially
can
be
and
short
rf-amplifier
-3
characteristics
addition
a
high
with
replaced
lead
GRID
are
comparable
accurate
J
degree
respect
lengths
applications
transconductance-to-plate-current
In
that
val
these
en
t i
addition,
tubes
npu t capaci
the
input
short-circuit
have
higher
tance
resistance
-2
VOLTS
with
-\
for
element
of
uniformity
to
interelectrode
a minimum
of
the
ratio
input-impedance
input
and
resistance
transconduc
of a completely
15000~
o
92CI.H0520
the
to
those
of
tubes
in
vhf
contributes
~
,
u
,
I
E
6CW4.
of
spacing
of
characteristics
circuit
make
television
than
tance.
neutralized
conventional
in
the
tubes
capacitances.
adjustment.
them
particu-
tuners.
to
low
measurements
other
These
tubes
measure-
triode
tube
- 2 -
====~
in
grid-drive
gain
input
where
at
vhf
resistance
!'
1S
R
IS
s
RL
IS
rp
1S
operation.
frequencies
results
the
amplification
the
source
the
load
the
plate
As
shown by
(impedance-matching
in
increased
Power
resistance
resistance,
resistance
G
aln
factor,
(matched
and
of
. _
the
following
losses
gain.
!,2RsRL
- 2
(rp+RL)
to
the
tube.
input
equation
neglected),
resistance),
for
power
increased
Neutralized
Fig.3 ing a 6CW4. 50-ohm bridge tuned
megacycle
admittance
shows
and
signal network
transformer-coupled
curves
susceptance
o~~s!
Grid-Drive
is a circuit diagram
In
this
generator
is
bandwidth.
was
varied
of
noise
for
used
this
Amplifier
circuit,
and
for
For
determination
by
use
factor
circuit.
TYPE
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n
: I I
1 1
I I OHM _
1 I
I I
I-=--=-
l-
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MEG-
I 1000
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1000 1000
~=;:...I~f
--L I --L
of a neutrali
input
load
neutralization.
network
of
and
6CW4
---
(~~_
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I
and
impedance,
tuned
the
Ilpi"
gain
1-75
JI4lf
-"
lO-7.5
p.~f
'-"H'=-I----.
OHMS
(
zed
output
respectively.
The
to
of
optimum
input-matching
as
functions
~
-=-
I30J£~(
.....J
( -
--L
I 1000
-=-
JJ.p..f'
grid-dri
networks
200
f-~I ~11
ve
ampli
are
A
plate
megacycles,
fn-------1
:
1 1
1 1
I I
, 1
I
L.
of
"='"
circuit,
noise
source
factor.
network.
IOHMS
1 I
-=-
I
.J
50
fier
employ-
matched
capacitive-
a
double-
has a six-
source
Fig.4
conductance
to
a
Noise-factor
limited
indicated
duction used
power was
this arbitrary and signal readings the
of
was
A
substitution
method,
the
to
gain
Fig.] -Circuit
measurements
diode
by a
rf
calibrated
doubled.
reference
signal-generator
the
of
of
noise
detected
noise
the
original
the
the
signals
method
voltage
level.
signal
amplifier
AGe
diagram
amplifier
generator.
output
from
to
indicate
was
output
The
output
reference
generator,
directly.
Er·6.3V
of a neutralized
employing
were
made by The
signal,
the
noise
noise
used
for
of a signal
amplifier
was
attenuated
level.
which
- 3 -
the
6CW4.
use
of a coaxial
noise
was
factor
measurement
was
power
increased
generator.
generator
was
then
The
difference
calibrated
grid-drive
of
The
directly
placed
to
reduce
the
3 db by
noise
when
of
power
was
in
the
between
in
db,
temperature-
circuit,
the
intro-
generator
the
noise
gain.
set
to
Some
the
circuit,
amplified
the
dial
indicated
as
In
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