Data set 01
1940 RCA
Published operating points and test conditions from this source.
Pentode
Other
receivers, The
35
receivers, The 19X8 hasa [50-milliampere heater (I)SEUEE e e e e i-g 35 mt:
The pentode mixer unit of the
100 V
The pentode mixer unit of the 19X8 provides Plate Voltages « « « o o o o « o & 100 volts
No.! and plate minimizes feedback probiems often for Plate Current of
-10 V
No.! and plate minimizes feedback probiems often for Plate Current of 10 wamp . . -10 volts
encountered in mixer circuits operating into Plate Current. . .« « « « v &« o «
8.5 mA
encountered in mixer circuits operating into Plate Current. . .« « « « v &« o « 8.5 ma
high-impedance plate loads., The low value of Plate Voltage. o« o v o o v o o o &
250 V
high-impedance plate loads., The low value of Plate Voltage. o« o v o o v o o o & 250 volts
a high-impedance plate circuit with resultant Grid-No
150 V
a high-impedance plate circuit with resultant Grid-No.2 Voltage. « « + « o + » & 150 volts
increase in mixer gain. Cathode-Bias Resistor. . PR
200 ohm
increase in mixer gain. Cathode-Bias Resistor. . PR 200 ohms
AM/ receivers. n e section, e pentode for Plate Current of
-10 V
AM/ receivers. n e section, e pentode for Plate Current of 10 uamp . . -10 volts
unit may be used as a pentode mixer to provide Plate Current. o« « + « « o o o o &
7.7 mA
unit may be used as a pentode mixer to provide Plate Current. o« « + « « o o o o & 7.7 ma
A N . Grid-No
1.6 mA
. A N . Grid-No.2 Current. . . .. 1.6 ma
may be used either as a pentode mixer or as a Plate voltage. « + « « = v ¢ o«
150 V
may be used either as a pentode mixer or as a Plate voltage. « + « « = v ¢ o« 150 volts
f . . . Cathode-Bias Res:stor. e e v e e
250 ohm
f . . . Cathode-Bias Res:stor. e e v e e 250 ohms
an rf stage, a pentode mixer not only provides for Plate Current of
-10 V
an rf stage, a pentode mixer not only provides for Plate Current of 10 pamp . . -10 volts
PLATE VOLTAGE. . . . Salus "
250 V
PLATE VOLTAGE. . . . Salus " 250 max. volts
Negatlve blas va ue «
40 V
Negatlve blas va ue « . 40 max. volts
GRID VOLTAGE Positive bias value
0 V
GRID VOLTAGE Positive bias value . . . 0 max. volts
GENERAL DATA GPLATE|DISS|PATI0N.© s b e e e s e e«
1.5 W
GENERAL DATA GPLATE|DISS|PATI0N.© s b e e e s e e« . 1.5 max, watts
RID INPUT . . . <«
0.5 W
. RID INPUT . . . <« . 0.5 max, watt
voltage (AC Or OC) + + + + « o« & &
100 V
voltage (AC Or OC) + + + + « o« & & 18.9 volts .., cathode . . . . ... 100 max. volts
Current. . . s e e e s
150 mA
Current. . . s e e e s 0.15 ampere Heater positive with respect to
pirect Intereiectrode’ capamtances: cathode
100 V
pirect Intereiectrode’ capamtances: cathode . . . . . . . 100 max. volts
Shield Shield# PLATE VOLTAGE. . . e s e
250 V
Shield Shield# PLATE VOLTAGE. . . e s e 250 max. volts
Trioqe unit: GR1D=-NO
0 V
Trioqe unit: GR1D=-NO.3 (SUPPRESSOR) VOLTAGE . e e . 0 max, volts
Grid to Plate., . .,
250 V
Grid to Plate., . ., 1.4 1.4 ppf GRID-NO.2 SUPPLY VOLTAGE . . . . « .« . 250 max. volts
Inpute & o & & & &
1
Inpute & o & & & & 2.0 2.6 put GRID-No.2 (SCREEN) VOLTAGE « . . . . & See Fig.1
Output . . o
1 pF
Output . . o . . . 0.5 1.0 uuf GRID-No.1 (CONTROL-GRID) VOLTAGE:
Pentode unit: Negative bias value. . . . + « + .+
40 V
Pentode unit: Negative bias value. . . . + « + .+ . 40 max. volts
Grid No
0 V
Grid No.1 to Plate 0.09 max. 0.06 max, puf Positive bias value., . . . . . « . 0 max. volts
Input
2 W
Input. . . . . . . 4.3 4.5 puf PLATE DISSIPATION. & o & « & o o o « o 2.0 max. watts
output
0.4 W
output . . . . 0.7 1.4 puf GRID-NO.2 INPUT. .+ « « o« o s e e e 0.4 max. watt
Pentode Grid No
1
Pentode Grid No. 1 to PEAK HEATER-CATHODE VOLTAGE
Pentode Plate to cathode
100 V
Pentode Plate to cathode. . . . . . . 100 max. volts
Heater to Cathode,
100 V
Heater to Cathode, . 5.2 5.2 puf cathode, . . . . . . 100 max. volts
PLATE VOLTAGE. . . . «
250 V
PLATE VOLTAGE. . . . « . 250 max. volts
GRID-NO
1
GRID-NO. 1 (CONTROL-GRID) VOLTAGE: »
Negative bias value., . . . + .+ + .«
40 V
Negative bias value., . . . + .+ + .« . 40 max, volts Z%
Positive bias value. . . + « « «
0 V
Positive bias value. . . + « « « . . 0 max. volts MAX.
PLATE DISSIPATION., . . . “ e e e
2.4 W
PLATE DISSIPATION., . . . “ e e e 2.4 max, watts
cathode,
100 V
cathode, . . . .. 100 max. volts
cathode. . . +
100 V
cathode. . . + . . . 100 max, volts
Plate voitage. . +« « v « o +» o & o &
150 V
Plate voitage. . +« « v « o +» o & o & 150 volts
Grid Resistor. . . . + . .« «
2700 ohm
Grid Resistor. . . . + . .« « . . . . 2700 ohms MAX. »* ”
Power Qutput (APProxX.) . + « + « + &
3 W
Power Qutput (APProxX.) . + « + « + & 0.5 watt 3 L4
Plate voltage. . . s e e e s
150 V
Plate voltage. . . s e e e s 150 volts
Grid-No
150 V
Grid-No.2 Voltage. . . I 150 volts
Mixer Grig-No
3.5 V
Mixer Grig-No.1 Supply VOltage . e . =3.5 volts
Grig No
2.6 V
Grig No.1. . . . 2.6 rms volts
Mixer Grid-No.i1-Circuit Res»stance
120000 ohm
Mixer Grid-No.i1-Circuit Res»stance 120000 ohms
Ptate Current. . . + . « . + « . +
6.2 mA
Ptate Current. . . + . « . + « . + . 6.2 ma
Grid-No
1.8 mA
Grid-No.2 Current. . . . « + . . . 1.8 ma
Grid-No
2
Grid-No.1i Current. . . ) 2.0 uamp SMALL BUTTON NOVAL
plate voltage. . . « e e
150 V
plate voltage. . . « e e 150 volts
Grid-No
3.5 V
Grid-No.1 Supply VOltage v e e s . =3.5 volts
Oscillator voltage at Grid No
1 V
Oscillator voltage at Grid No.1 . . 2.6 rms volts AS DETERMINED BY RING GAUGE OF 7/16" 1.D.
Plate Current. . . « « ¢ « « «
7.8 mA
Plate Current. . . « « ¢ « « « 4 . . 7.8 ma
Grid-No
2
Grid-No.1 Current. . « . « « +« . . . 2.0 pamp
For fixed-bias operation
0.1
For fixed-bias operation . . . . . . 0.1 max. megohm
For cathode~-bias operation
0.5
For cathode~-bias operation . . . . . 0.5 max, megohm SOCKET CONNECTIONS
from ac or dc power-line supplies whose normal voltage PIN
4
from ac or dc power-line supplies whose normal voltage PIN 4: HEATER
line~center voltage value of
117 V
line~center voltage value of 117 volts.
impedance ofthe first if coil does not exceed
2 ohm
impedance ofthe first if coil does not exceed 75000 ohms, PIN 8: PENTODE GRID No.2
[T THIS CURVE ALSO APPLIES TO TYPES Fl £ g =
189 V
[T THIS CURVE ALSO APPLIES TO TYPES Fl £ g =189 vOLTS
GRID-N®
2
GRID-N® 2 VOLTAGE EXPRESSED AS PER CENT OF MAX. < ol o
2 SUPPLY VOLTAGE RATING PLATE (Is) OR GRID (I¢) MILLIAMPERES
2
2 SUPPLY VOLTAGE RATING PLATE (Is) OR GRID (I¢) MILLIAMPERES
92CM-7779
7779
92CM-7779
I E¢£ =
19 V
I E¢£ =18.9 VOLTS E £=19.
ol GI:ID-NQ
3 V
ol GI:ID-NQ 2 VOLTS=150 t:_ GRID N2 3 CONNECTED TO CATHODE
M GRID-NZ
2 V
M GRID-NZ 3 VOLTS=0 j_ GRID N2 2 CONNECTED TO PLATE
—— >
4
—— > 4\‘!’ ™ °
PLATE (Ib) OR GRID~-N2
1
PLATE (Ib) OR GRID~-N22 (1C2) MILLIAMPERES LATE MILLIAMPERES
92CM-7777 92CM~7787
7787
92CM-7777 92CM~7787
E ¢ =IBY VOLTS I Ep
189 V
E ¢ =IBY VOLTS I Ep 189 VOLTS
PLATE VOLTS =
150 V
PLATE VOLTS =150
i PLATE VOLTS
150 V
i PLATE VOLTS 150
GRID-N2
0 V
GRID-N2 3 VOLTS GRID-N2 3 VOLTS 0
I GRID-N2
150 V
I GRID-N2 2 VOLTS 150 GRID-N2 2 VOLTS 150
Characteristic
other tubes having !
50
other tubes having !50-milliamperes heaters. Characteristics:
low grid=No.|~to-plate capacitance as compared cathode-Bjas Resistor
100 ohm
low grid=No.|~to-plate capacitance as compared cathode-Bjas Resistor. . . . . . . 100 ohms
Ampl|f|cat|on Factor o« + ¢« o o« » &
40
. . . . Ampl|f|cat|on Factor o« + ¢« o o« » & 40
withatriode mixer and also has low output capaci~ Plate Resistance (ApPprox.)
6900 ohm
withatriode mixer and also has low output capaci~ Plate Resistance (ApPprox.) . . . . 6900 ohms
tance. The low value of capacitance between grid Transconductance . . « o« « « + o
5800
tance. The low value of capacitance between grid Transconductance . . « o« « « + o 5800 pmhos
Plate Resistance (Approx. ) « s«
750000 ohm
Plate Resistance (Approx. ) « s« . 750000 ohms
The
4600
The 19X8 offers versatility to designers of Transconductance + « « & « o« o . 4600 umhos
retatively low equivalent noise resistance, they Amplification Factor . . « « o +
32
retatively low equivalent noise resistance, they Amplification Factor . . « « o + . 32
are preferred for receiver designs which do not Plate Resistance (Approx.}
7900 ohm
are preferred for receiver designs which do not Plate Resistance (Approx.} . . . . 7900 ohms
P . . . Transconductance . . . “ e e e
4000
P . . . Transconductance . . . “ e e e 4000 pmhos
Conversion Transconductance
2100
Conversion Transconductance. . . . . 2100 pmhos
Grid-No
120000 ohm
Grid-No.1-Circuil Resistance . . . 120000 ohms
Conversion Transconductance
2800
Conversion Transconductance. . . . 2800 pmhos