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2CVV4,
6CVV4,
13CVV4
values
of
serIes
plate-circuit
resistance.
The
regIon
of
permissible
oper-
ation
is
bounded
by
the
lines
representing
plate
dissipation
=
1.5
watts,
plate
voltage
=
135
volts,
and
plate
current
=
15
milliamperes.
In
class
Al
amplifier
service,
because
no
grid
current
flows,
the
plate
current
rating
IS
equivalent
to
the
cathode
current
rating.
To
determine
the
required
minimum
series
plate-circuit
resistance
for
a
given
set
of
o~rating
conditions:
1.
From
Fig.2,
Average
Plate
Characteristics,
select
the
desired
oper-
ating
conditions.
2.
From
Fig.l
determine
the
corresponding
maximum
plate
dissipation
and
required
minimum
value
of
series
plate-circuit
resistance.
Example:
(a)
From
Fig.2
-
for
a
plate
voltage
of
130
volts
and
a
grid
voltage
of
-1
volt,
the
corresponding
plate
current
is
10.5
milliamperes.
•
(b)
From
Fig.l
-
the
plate
dissipation
for
a
plate
voltage
of
130
volts
and
a
plate
current
of
10.5
milliamperes
is
approximately
1.
37
watts.
The
required
minimum
series
plate-circuit
resistance
for
this
plate
dissipation
is
3700 ohms.
<.'
.
Et
=6.3
VOLTS
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.
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0.'
~~
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../
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~
0.4
0/./
Z
·t->:=-
0'j;.o/q i/-j-+-++--+-f---+-+1--1
0.2 135
lJ
20
40
60
80
100 120 140
PLATE
VOLTS
92CM-II&81
Fig.1
-
Plate-Dissipation
Rating
Chart
for
Types
2C1f4. 6C1f4.
and
13C1f4.
o 0
N
2
o
N
PLATE MILLlAMPERES
9ZCIll~IO~24RI
Fig.2
-
Average
Plate
Characteristics
for
Type
6Clf4
and
for
Types
2Clf4
and
13Clf4
Except
for
Heater
Voltage.
- 5 -