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8XP4

Eight-inch P4 cathode-ray display tube for high-voltage direct visual service, using magnetic deflection and manufacturer-specified focusing, grid-control, and accelerating-voltage characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: 12S
Socket code: DUODECAL5
Base pins: 5
Nominal heater: 6.3 V / 600 mA

Description

The Sylvania 8XP4 is a 8-inch rectangular P4 receiver-check CRT with self-focusing electrostatic gun and magnetic deflection.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 12S
Socket code: DUODECAL5
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

12S - 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

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Cathode-ray section. CRT anode/ultor, grid, focus/deflection, heater-cathode, capacitance, and operating values are stored as section parameters.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Phosphor
P4
Focusing Method
Self Focusing (Electrostatic)
Deflecting Method
Magnetic

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Self-Focusing Electrostatic text
Deflection Method
Magnetic text
Deflection Angle
90 deg
Approximate
Phosphor
P4 text
Fluorescence
White text
Persistence
Short to Medium text
Cathode-to-All Capacitance
5 pF
Approximate
Grid1-to-All Capacitance
6 pF
Approximate

Other

Maximum Anode Voltage
22000 V
Maximum Grid2 Voltage
550 V
Maximum Grid1 Negative Bias
155 V
RepresentativePublishedLimit
Maximum Grid1 Positive Peak
2 V
Maximum Heater-Cathode Voltage During Warmup
450 V
Duration<=15s
Maximum Heater-Cathode Voltage After Warmup
200 V
Anode Voltage
16000 V
Grid2 Voltage
300 V
Grid1 Cutoff Voltage Minimum
-72 V
Grid1 Cutoff Voltage Maximum
-28 V
Maximum Grid1 Circuit Resistance
1.5 Mohm

Data set 03

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

Cathode to All Other Electrodes Capacitance
5 pF
Grid #1 to All Other Electrodes Capacitance
6 pF

Characteristics

Focusing Method
Electrostatic self-focus
Deflecting Method
Magnetic

Other

Anode Voltage
- to 22000 V
Design maximum
Grid #2 and Grid #4 Voltage
- to 550 V
Grid #1 Negative Peak Voltage
- to 220 V
Grid #1 Negative Bias Voltage
- to 155 V
Grid #1 Positive Bias Voltage
- to 0 V
Grid #1 Positive Peak Voltage
- to 2 V
Peak Heater-Cathode Voltage - Heater Negative During Warm-Up
- to 450 V
Warm-up period <=15 s
Peak Heater-Cathode Voltage - Heater Negative After Warm-Up
- to 200 V
Peak Heater-Cathode Voltage - Heater Positive
- to 200 V
Anode Voltage
16000 V
CathodeDrive
Grid #2 and Grid #4 Voltage
400 V
CathodeDrive
Cathode Voltage for Visual Extinction
36 to 78 V
CathodeDrive
Grid #1 Circuit Resistance
- to 1.5 MΩ
Maximum circuit value