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2P21

Image-orthicon television camera tube using a semitransparent photocathode, magnetic focusing and deflection, and electron-multiplier output. It converts an optical image into a scanned electrical television signal.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: JUMBOANNULAR7
Base pins: -
Nominal heater: -

Description

from RMA #825 Feb. 1, 1950 2P2| IMAGE ORTHICON DATA General: Heater, for Unipotential Cathode: vVoltage (AC or OC). . . . . « . . Current . . .« . . + + v ¢ o & 4 . . Direct Interelectrode Capacitance: Anode to All Other Electrodes . . ., e Photocathode, Semi-transparent: Response. . . . . « « + ¢« « « o« « . « « « . See Fig.| Useful Size of Rectangular Image (4 aspect ratio) . |.6" Diagonal Focusing Method . . . . . . . . . . . x . . e e e Magnetic Deflection Method . . . . . . . . . . . . . . e e Magnetic Overal! Length. . . . . . . + .+ & o . N 15-1/74% £ j72V Greatest Diameter of Bulb . . . . . . . . . e vt i/ 18" Shoulder Base . . . . . . . « v 4« « . s+ + + « « Jumbo Annular 7-Pin End Base. . . . . . . . .« « 4 4 . . . . Small-Shell Diheptal I|4-Pin Deflecting-~~Coil Length. . . . . . . . » .. RN e . 5n Focusing~~Coi! Length. . . . . . . . . T oA Alignment-Coil tength ., . e e e e ..

Socket description

Jumbo annular 7-contact shoulder base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: JUMBOANNULAR7
Base pins: -
Nominal heater voltage: -
Nominal heater current: -
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

CameraPickup

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Source-derived section; promoted values populated where applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

CameraPickup

Other

PHOTOCATHODE VOLTAGE. . « ¢« « + « « &
450 V
PHOTOCATHODE VOLTAGE. . « ¢« « + « « & 450 max. volts
GRID-No
450 V
GRID-No.6 (ACCELERATOR) VOLTAGE . . . 450 max. volts
OVERALL MULTIPLIER VOLTAGE®
1650 V
OVERALL MULTIPLIER VOLTAGE® . . . . . 1650 max. volts
MULTIPLIER VOLTAGE PER STAGE
350 V
MULTIPLIER VOLTAGE PER STAGE. . . . . 350 max. volts
Negative bias value
100 V
Negative bias value . . . . . - 100 max. volts
Positive bias vatue
0 V
Positive bias vatue . . . . . . . . 0 max. volts
Photocathode Voltage (Image Focus)**
-300 V
Photocathode Voltage (Image Focus)**. -300 volts
Grid-No
6
Grid-No.6 Voltage (Accelerator)—
80% of photocathode voltage® ~240 volts
240 V
80% of photocathode voltage® ~240 volts
Grid-No
25 V
Grid-No.5 Voltage (Deceleratori# . . . . . . .+ ¢« . . 25 volts
Grid-No
125 V
Grid-No.4 Voltage (Beam Focus)## . . . . . « « « « « . 125 volts
Grid=No
210 V
Grid=No.3 Voltageo. et e e e s e e e e e e e e e e 210 volts
Grid-No
210 V
Grid-No.2 & Dynode-No.| Voltage . . . . . . . . . . . . 210 volts
Grid-No.| Voltage (For Picture Cutoff)?
45 V
Grid-No.| Voltage (For Picture Cutoff)?9, . . . . . . . ~45 volts
Dynode~No
525 V
Dynode~No.2 Voltage . . . « +« « « ¢ o ¢ o o o v 0 0 . 525 volts
Dynode-No
850 V
Dynode-No.3 voltage . . . . . . . . « « v o o 0. e 850 volts
Dynode-No
1150 V
Dynode-No.4 Voltage . . . . . <« . « ¢« o v ¢ ¢« o o s e 1150 volts
Dynode-~No
1450 V
Dynode-~No.5 Voltage . . . . . . . « « « o « o o <« 4 1450 volts
Anode Voltage . . . . o v &
1500 V
Anode Voltage . . . . o v & 0 o i v et e e e e 0 e e 1500 volts
Target Operating Temperature. . . . . e e e e e e
4
Target Operating Temperature. . . . . e e e e e e 35 to 4b °c
For best operation, this voltage should be adjustable within +
25
For best operation, this voltage should be adjustable within + 25%of indicated value,
Adjustable within &
3 V
Adjustable within & 3 volts of indicated value, with blanking voltage off,
For best operation, thisvoltage should beadgustgble within
100
For best operation, thisvoltage should beadgustgble within 2 100% of indicated value.
oo Adjustable over range from
70 V
oo Adjustable over range from -5 to ~70 volts.