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27ZP4

Twenty-seven-inch 110-degree television CRT with electrostatic focusing, magnetic deflection, gray-filter faceplate, and aluminized P4 screen. Its wide-angle construction supports a shallow direct-view monochrome receiver.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Twenty-seven-inch 110-degree television CRT with electrostatic focus, magnetic deflection, gray-filter faceplate, and aluminized P4 screen.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12A
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
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

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 16 V
Max screen voltage: 550 V

Electrical section extracted from supplied datasheet.

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

Heater Voltage . . . . . . . . . . . .. .. 6.3 Volts
6.3 V
Heater Voltage . . . . . . . . . . . .. .. 6.3 Volts
Minimum Anode Voltage . . . . . 12,000 Volts dc
12 V
Minimum Anode Voltage . . . . . 12,000 Volts dc
Grid No. 4 Voltage (Focusmg Electrode) .. —550 to +1100 Volts dc
1100 V
Grid No. 4 Voltage (Focusmg Electrode) .. —550 to +1100 Volts dc
Grid No. 2 Voltage . . . . . .. .. 550 Volts dc
550 V
Grid No. 2 Voltage . . . . . .. .. 550 Volts dc
Grid No. 1 Voltage
1 V
Grid No. 1 Voltage
Anode Voltage . . . . . . . .. Lo o s e 18,000 Volts dc
18 V
Anode Voltage . . . . . . . .. Lo o s e 18,000 Volts dc
Grid No. 4 Voltage for Focus . . . . . . . . . . . o000 oL 0 to 400 Volts dc
400 V
Grid No. 4 Voltage for Focus . . . . . . . . . . . o000 oL 0 to 400 Volts dc
Grid No.2Voltage . . . . . . . . . . . . ... o oo 300 Volts dc
300 V
Grid No.2Voltage . . . . . . . . . . . . ... o oo 300 Volts dc
Grid No. 1 Voltage Required for Cutoff® . . . . . . . . . .. . ... ... .. —35to —72 Volts dc
72 V
Grid No. 1 Voltage Required for Cutoff® . . . . . . . . . .. . ... ... .. —35to —72 Volts dc
3. Visual extinciion offocused raster. Extinction of stationary focused spor will require that these
5 V
3. Visual extinciion offocused raster. Extinction of stationary focused spor will require that these values be about 5 volts more negative.

Other

External Conductive Coating to Anode® . . 2500 uuf Max.
2500 pF
External Conductive Coating to Anode® . . 2500 uuf Max.
Maximum Anode Voltage . . . . . . . . . 22,000 Volts dc
22 V
Maximum Anode Voltage . . . . . . . . . 22,000 Volts dc
Maximum Heater Voltage . . . . . . . . .. 6.9 Volts
6.9 V
Maximum Heater Voltage . . . . . . . . .. 6.9 Volts
range if this tube is operated at higher than the manufacturer's Maximum Rated Anode Voltage or 16,0
16 V
range if this tube is operated at higher than the manufacturer's Maximum Rated Anode Voltage or 16,000 volts, whichever is less.

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Maximum Grid No. 2 voltage
550 V
Published maximum Grid No. 2 voltage
Maximum Anode voltage
22000 V
Maximum Anode voltage ....... •... 22,000Volts
Grid No. 2 Voltage
550 V
Grid No. 2 Voltage ........... .... 550Volts
After Equipment warm-up period
200 V
After Equipment warm-up period . 200 Volts SENECA FALLS, NEW YORK
Heater Positive with Respect to Cathode
200 V
Heater Positive with Respect to Cathode 200 Volts Pre|4red and R|eledced By The
Anode voltage
18000 V
Anode voltage ........................ 18,000 Volts
Grid No. 4 Voltage for Focus
400 V
Grid No. 4 Voltage for Focus .................. 0 to 400 Volts
Grid No. 2 Voltage
300 V
Grid No. 2 Voltage ...................... 300 Volts

Characteristic

Heater current
600 mA
Published heater current
LightTransmittance (Approx.) . . . •
70 %
LightTransmittance (Approx.) . . . •..... 70Percent
Heater voltage
6.3 V
Heater voltage ............. . . 6.3Volts

CircuitValue

Grid No. 1 Circuit Resistance
1.5 Mohm
Grid No. 1 Circuit Resistance .................. 1.5 Megohms Max.