Data set 01
1940 RCA
Published operating points and test conditions from this source.
CameraPickup
Other
The 7038 utilizes aunique a modulating voltage of suitable waveform to the
7038 V
The 7038 utilizes aunique a modulating voltage of suitable waveform to the
——m—m— voltage (AC or DC) P 6.3 +
109 V
——m—m— voltage (AC or DC) P 6.3 + 109 volts
Current
600 mA
Current. . . . . . 0.6 amp
other etectrodes
4.6 pF
other etectrodes . . . . . . . . . 4.6 uuf
a condition necessary for driving the surface to GRID-NO.3 & GRID-No.4 VOLTAGE. . . . . 350 max. vol
350 V
a condition necessary for driving the surface to GRID-NO.3 & GRID-No.4 VOLTAGE. . . . . 350 max. volts
cathode potential. The beam electrons approach GRID-NO.2 VOLTAGE . . « « « « . . . . 350 max. volts
350 V
cathode potential. The beam electrons approach GRID-NO.2 VOLTAGE . . « « « « . . . . 350 max. volts
the layer at low velocity because of the low GRI1D-No
1 V
the layer at low velocity because of the low GRI1D-No.1 VOLTAGE:
operating potential of the signal electrode. Negative bias value. . . . . . . . . 125 max. volts
125 V
operating potential of the signal electrode. Negative bias value. . . . . . . . . 125 max. volts
Positive bias value. . . . . . . . . 0 max. volts
0 V
Positive bias value. . . . . . . . . 0 max. volts
to cathode, . . 125 max. volts
125 V
to cathode, . . 125 max. volts
posited fromthe beam until the surface potential to cathode. . . 10 max. volts
10 V
posited fromthe beam until the surface potential to cathode. . . 10 max. volts
Grid-No.2 (Accelerator) voltage. 300 volts T Indicated range for each type of service serves only
300 V
Grid-No.2 (Accelerator) voltage. 300 volts T Indicated range for each type of service serves only
Grid-No. 1 VOltage for Plcture to illustrate the operating target-voltage range
1 V
Grid-No. 1 VOltage for Plcture to illustrate the operating target-voltage range
Cutoff® | - -45 to —-100 volts normally encountered
-100 V
Cutoff® | - -45 to —-100 volts normally encountered.
Average "Gamma" of Transfer The target voltage for each 7038 must be adjusted to that
7038 V
Average "Gamma" of Transfer The target voltage for each 7038 must be adjusted to that
when applied to grid No.1. . . . 75 volts Video amplifiers must be designed properly to handle
75 V
when applied to grid No.1. . . . 75 volts Video amplifiers must be designed properly to handle
Wwhen applied to cathode. . . . . 20 volts target currents of this magnitude to avoid amplifier
20 V
Wwhen applied to cathode. . . . . 20 volts target currents of this magnitude to avoid amplifier
in Any Tube®*, . . 110 volts limiting values above which its serviceability
110 V
in Any Tube®*, . . 110 volts limiting values above which its serviceability
Target voltageT 60 to
100 V
Target voltageT 60 to 100 volts
in Any Tube**
60 V
in Any Tube** . . 60 volts
Target Vo]tagef.e e e 30 to
50 V
Target Vo]tagef.e e e 30 to 50 volts
Max. Target voltage Required to The base pins of the 7038 fit the ditetrar
7038 V
Max. Target voltage Required to The base pins of the 7038 fit the ditetrar
in Any Tube
30 V
in Any Tube .. . 30 volts
Target VO1tageT. 15 to
25 V
Target VO1tageT. 15 to 25 volts
ance of the 7038, is increased when the tube is mounted the tube and by a clamping mechanism near th
7038
ance of the 7038, is increased when the tube is mounted the tube and by a clamping mechanism near the
the order of 100 megohms. should be such that the horizontal scan is
100 ohm
the order of 100 megohms. should be such that the horizontal scan is
crease with decreasnng grid-No.4 and grid-No
3 V
crease with decreasnng grid-No.4 and grid-No.3 voltage.
above 250 volts. should be of high quatity and provide depth of
250 V
above 250 volts. should be of high quatity and provide depth of
amp]nfner having bandwidth of 5Mc. Because the noise
5 A
amp]nfner having bandwidth of 5Mc. Because the noise
HIGHLIGHT SIGNAL - OUTPUT MICROAMPERES =
200 mA
HIGHLIGHT SIGNAL - OUTPUT MICROAMPERES = 0.2
DARK CURRENT (MICROAMPERES)= 0.2 v o The alignment cotl should be located on the
200 mA
DARK CURRENT (MICROAMPERES)= 0.2 v o The alignment cotl should be located on the
Fig.3. The target voltage must be adjusted to The focusing-electrode (grid No.3) voltage
3 V
Fig.3. The target voltage must be adjusted to The focusing-electrode (grid No.3) voltage
produce the desired value of dark current depend- may be fixed at a value of about 280 volts when
280 V
produce the desired value of dark current depend- may be fixed at a value of about 280 volts when
voltage. Operation at a grid-No.3 voitage below
3 V
voltage. Operation at a grid-No.3 voitage below
260 volts is not recommended. The necessary
260 V
260 volts is not recommended. The necessary
focusing device, the grid-No.3 voltage should be
3 V
focusing device, the grid-No.3 voltage should be
adjustabte over a range from 250 to
300 V
adjustabte over a range from 250 to 300 volts.
grid-No.3 voltage. in general, grid No
4 V
grid-No.3 voltage. in general, grid No.4 and
grid No.3 should be operated above
250 V
grid No.3 should be operated above 250 volts.
The grid-No.1 voltage should be adjustable
1 V
The grid-No.1 voltage should be adjustable
from O to —
-110 V
from O to —-110 volts.
The dc voltages required by the 7038 can be
7038 V
The dc voltages required by the 7038 can be
R3 N23 AND N24 AMPLIFIER factory operation of the
7038
R3 N23 AND N24 AMPLIFIER factory operation of the 7038
1t that the target voltage be
1 V
1t that the target voltage be
C1 Cy¥: 0.1 uf, 300 volts (worklng R1: 120000 ohms, 1/2 watt 3 foot-candles on the faceplate
3 V
C1 Cy¥: 0.1 uf, 300 volts (worklng R1: 120000 ohms, 1/2 watt 3 foot-candles on the faceplate
voltage) R2: 100000~ohm potentiometer, 2 watts of the 7038. Such a low
7038 V
voltage) R2: 100000~ohm potentiometer, 2 watts of the 7038. Such a low
C2: 0.1 uf, 300 volts (working R3: 50000—ohm potentiometer, 2 watts . . . i
2 V
C2: 0.1 uf, 300 volts (working R3: 50000—ohm potentiometer, 2 watts . . . i
voltage) RL: 70000 ohms, 1/2 watt iflumination fevel, however,
2 V
voltage) RL: 70000 ohms, 1/2 watt iflumination fevel, however,
€3 €5: 0.1 uf, 200 volts (working R5: 5000 ohms, 1/2 watt requires maximum-sensitivity
2 V
€3 €5: 0.1 uf, 200 volts (working R5: 5000 ohms, 1/2 watt requires maximum-sensitivity
voltage) R6: 10000 ohms, 1/2 watt A
2 V
voltage) R6: 10000 ohms, 1/2 watt A .
C6: 4 uf, electrolytic, 300 volts R7: 200000 ohms, 1/2 watt operationof the 7038. For this
7038 V
C6: 4 uf, electrolytic, 300 volts R7: 200000 ohms, 1/2 watt operationof the 7038. For this
(working voltage) R8: 50000 ohms, 1/2watt, non—inductive type of operation, adark current
2 V
(working voltage) R8: 50000 ohms, 1/2watt, non—inductive type of operation, adark current
M: Target-Current Meter, RCA Ultra- R9: 100000 ohms, 1/2 watt . . A
2 W
M: Target-Current Meter, RCA Ultra- R9: 100000 ohms, 1/2 watt . . A
sensitive Microammeter wv-guB, or RI0: 500000-0hm potentiometer,2 watts of 0.2 microampere is requir
200 mA
sensitive Microammeter wv-guB, or RI0: 500000-0hm potentiometer,2 watts of 0.2 microampere is required.
equrva]ent Ri1: 1000 ohms, 1/2 watt, non-inductive This value will be obtained for
2 W
equrva]ent Ri1: 1000 ohms, 1/2 watt, non-inductive This value will be obtained for
Fig.q4 - Typical Voltage Dividers for Supplying rangeof 60 to |00 volts. Under
0 V
Fig.q4 - Typical Voltage Dividers for Supplying rangeof 60 to |00 volts. Under
DC Electrode Voltages to Type 7038. such low—level illumination
7038 V
DC Electrode Voltages to Type 7038. such low—level illumination
highlight target current of 0.5 microampere ilfumination and lower dark current
500 mA
highlight target current of 0.5 microampere ilfumination and lower dark current.
the faceplate, adark current of
20 mA
the faceplate, adark current of 0.02 microampere
having an 8-Mc bandwidth as shown in Fig
5 MHz
having an 8-Mc bandwidth as shown in Fig.5 (b).
Aperture correction compensates for the aper— target voltagewithin the range of 30 to B
30 V
Aperture correction compensates for the aper— target voltagewithin the range of 30 to B0 volts.
Over the entire broadcast bandwidth of 4.5 Mc, will range between |5 and
25 V
Over the entire broadcast bandwidth of 4.5 Mc, will range between |5 and 25 volts.
Fig.6. This compensation, however, does not The exact value of target voltage to give the
6 V
Fig.6. This compensation, however, does not The exact value of target voltage to give the
7038 CONTROL CORRECTION AMPLIFIER OUTPUT
7038
7038 CONTROL CORRECTION AMPLIFIER OUTPUT
NOTE: IT 1S RECOMMENDED THAT THIS PREAMPLIFIER BE SHOCK-MOUNTED
1
NOTE: IT 1S RECOMMENDED THAT THIS PREAMPLIFIER BE SHOCK-MOUNTED
C1 €3 C5: 0.01 uf, 100 volts R1 R4 R5 R6: 100 ohms, 1/
2 V
C1 €3 C5: 0.01 uf, 100 volts R1 R4 R5 R6: 100 ohms, 1/2 watt
C2: 2000 uf, electrolytic, 3 volts R2: 500000 ohms, 1/
2 V
C2: 2000 uf, electrolytic, 3 volts R2: 500000 ohms, 1/2 watt
Cy: 0.01 pf, 350 volts R3: 15 ohms, 1/
2 V
Cy: 0.01 pf, 350 volts R3: 15 ohms, 1/2 watt
C6: 90 uf, electrolytic, 350 volts R7: 12 ohms, 1/
2 V
C6: 90 uf, electrolytic, 350 volts R7: 12 ohms, 1/2 watt
C7: 0.1 uf, 350 volts R8: 100000 ohms, 1/
2 V
C7: 0.1 uf, 350 volts R8: 100000 ohms, 1/2 watt
¢8: 0.1 pf, 300 volts RG9: 1 megohm, 1/
2 V
¢8: 0.1 pf, 300 volts RG9: 1 megohm, 1/2 watt
Li: 12 wh peaking coil, adjustable R10 R11: 1800 ohms,
2 W
Li: 12 wh peaking coil, adjustable R10 R11: 1800 ohms, 2 watts
core to cover range from 9 to 15 uh R12: 470 ohms,
2 W
core to cover range from 9 to 15 uh R12: 470 ohms, 2 watts
Fig.s (b) - Low-Noise Cascode Preamplifier Having 8-Mc Bandwidth
8 MHz
Fig.s (b) - Low-Noise Cascode Preamplifier Having 8-Mc Bandwidth.
the input of the video preamplifier to indicate approximately 0.65. This value is relatively
0.65
the input of the video preamplifier to indicate approximately 0.65. This value is relatively
The maximum amount of illumination on the target voltage, or 50 to | in dark current,
50 V
The maximum amount of illumination on the target voltage, or 50 to | in dark current,
temperature of the faceplate which should never and 0.3 microampere. Close uniformity in the
300 mA
temperature of the faceplate which should never and 0.3 microampere. Close uniformity in the
target voltage neededto give maximum sensitivity the 7038 can be achieved by compensating for the
7038 V
target voltage neededto give maximum sensitivity the 7038 can be achieved by compensating for the
at a dark current of 0.2 microampere may range beam landing errors that are introduced by the
200 mA
at a dark current of 0.2 microampere may range beam landing errors that are introduced by the
between 60 and 100 volts, it is essential that deflecting and focusing components used with the
100 V
between 60 and 100 volts, it is essential that deflecting and focusing components used with the
FHIGHLIGHT TARGET MICROAMPERES=0.35 w2 AMPERES =
300 mA
FHIGHLIGHT TARGET MICROAMPERES=0.35 w2 AMPERES =0.3
DARK CURRENT (MICROAMPERES)= 0.02 Q SCANNED AREA OF I?HOTOCONDUCTIVE
20 mA
DARK CURRENT (MICROAMPERES)= 0.02 Q SCANNED AREA OF I?HOTOCONDUCTIVE
FHIMc= 80 TV LINES (APPROX.) T
8
FHIMc= 80 TV LINES (APPROX.) T 8
; 4.5Mc BROADCAST____| T . ] \\
4.5
; 4.5Mc BROADCAST____| T . ] \\
waveform to the cathode of the 7038. The de— tional design. The modulating voltage is applied
7038 V
waveform to the cathode of the 7038. The de— tional design. The modulating voltage is applied
25 volts 450 volts Underscanning of the photoconductive layer
450 V
25 volts 450 volts Underscanning of the photoconductive layer
450 volts
400 V
450 volts 400 volts
400 volts |, 450 volts condition which produces a larger-than-normal
450 V
400 volts |, 450 volts condition which produces a larger-than-normal
Characteristic
circuit and the scanning beam, a capacitive Electrode™®) voltage. - . . . . . 250 to
300 V
circuit and the scanning beam, a capacitive Electrode™®) voltage. - . . . . . 250 to 300 volts
Fig.2 - Typical Characteristics of Type 7038. voltage to maintain the desired dark current, as
7038 V
Fig.2 - Typical Characteristics of Type 7038. voltage to maintain the desired dark current, as