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27GP4

Twenty-seven-inch direct-view monochrome television picture tube with magnetic deflection and high-voltage operation. Manufacturer documentation provides focusing, optical, and electrical characteristics for large-screen receiver display service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Direct-view cathode-ray picture tube intended for television display service. The supplied Tung-Sol datasheet provides electrical ratings, operating conditions, capacitances, optical characteristics, focusing and deflection information.

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: -
Socket code: DUODECAL5
Base pins: 12
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: 22500 V
Max screen voltage: 500 V

Direct-view television CRT; high-voltage electrode rating mapped to MaxPlateVoltage as the section high-voltage limit.

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 Current (approx) . . . . . . . 06 Ampere
6 A
Heater Current (approx) . . . . . . . 06 Ampere
Anode Voltage. . . . . . . . . . .22500 Volts dc
22500 V
Anode Voltage. . . . . . . . . . .22500 Volts dc
Grid No. 1 Voltage . o
1 V
Grid No. 1 Voltage . o
Anode Voltage! . . . . . . . . . . . . . . .20,000 Volts dc
20 V
Anode Voltage! . . . . . . . . . . . . . . .20,000 Volts dc
Grid No. 2 Voltage . . . . . . . . .300 Vol dc
2 V
Grid No. 2 Voltage . . . . . . . . .300 Vol dc
Grid No. 1 Voltage? Requ1red for Cutoﬁ . . . . =281t0-72 Volts dc
-72 V
Grid No. 1 Voltage? Requ1red for Cutoﬁ . . . . =281t0-72 Volts dc
Focusing Coil Current® . . .. . . .125 #= 209 Ma dc
209 Ma
Focusing Coil Current® . . .. . . .125 #= 209 Ma dc
Anode Voltage or 16,000 volts, whichever is less.
16 V
Anode Voltage or 16,000 volts, whichever is less.

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

Heater Cathode Capacitance
5 pF
Approximate

Other

HighVoltageElectrodeMaximum
22500 V
CRT

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

HABNETIC FOCUS b DEFLEC110M
10
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
RECTANGULAR GLASS CONSTRUCTION — value 1
1
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
RECTANGULAR GLASS CONSTRUCTION — value 2
10
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DIRECT INTERELECTRODE CAPACITANCES (APPROX.)
1
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
GRID #1 TO ALL OTHER ELECTRODES — value 1
1
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
GRID #1 TO ALL OTHER ELECTRODES — value 2
0
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
GRID #1 TO ALL OTHER ELECTRODES — value 3
6
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
PHOSPHOR NUMBER
4
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
FACEPLATE LIGHT TRANSMISSION AT CENTER (APPROX.) — value 1
11 percent
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
FACEPLATE LIGHT TRANSMISSION AT CENTER (APPROX.) — value 2
66 percent
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
HEATER
3 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
HEATER CURRENT
600 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
HEATER POSITIVE WITH RESPECT TO CATHODE — value 1
1 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
HEATER POSITIVE WITH RESPECT TO CATHODE — value 2
0 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC ANODE SGRID #3 VOL TAGE B — value 1
3 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC ANODE SGRID #3 VOL TAGE B — value 2
16000 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC GRID #2 VOLTAGE — value 2
300 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC GRID #i VOLTAGE C — value 1
1 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC GRID #i VOLTAGE C — value 2
33 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC GRID #i VOLTAGE C — value 3
77 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC FOCUSING COIL CURRENT (APPROX.)D — value 1
95 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC FOCUSING COIL CURRENT (APPROX.)D — value 2
20 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 1
10 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 2
111 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 3
100 mA
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
BIF TXIS TUBE IS OPERATED AT VOLTAGES IN E%CESS OF 16.000 VOLTS, X-RAY RADI ATIOM SX IEL DING MAY — value 1
0 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
BIF TXIS TUBE IS OPERATED AT VOLTAGES IN E%CESS OF 16.000 VOLTS, X-RAY RADI ATIOM SX IEL DING MAY — value 2
16 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
BIF TXIS TUBE IS OPERATED AT VOLTAGES IN E%CESS OF 16.000 VOLTS, X-RAY RADI ATIOM SX IEL DING MAY — value 3
1 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
CVISV AL EXTINCTION OF UNOEfI ECT ED FOCUSED SPOT.
0
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DFOR STANDARD FOCUS COIL /109, OR EQUIVALENT. WI TX TXE COMBINED GRID /1 BIAS VOLTAGE AMD VIDEO — value 1
109 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DFOR STANDARD FOCUS COIL /109, OR EQUIVALENT. WI TX TXE COMBINED GRID /1 BIAS VOLTAGE AMD VIDEO — value 2
0 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
DFOR STANDARD FOCUS COIL /109, OR EQUIVALENT. WI TX TXE COMBINED GRID /1 BIAS VOLTAGE AMD VIDEO — value 3
1 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
SI GX AL VOLTAGE AD JU STEO TO PRODUCE A NIGHLIGHT BRI GX TXE SS OF 20 FOOT CAMBER TS OM A 24 1/4 " BY — value 1
0 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
SI GX AL VOLTAGE AD JU STEO TO PRODUCE A NIGHLIGHT BRI GX TXE SS OF 20 FOOT CAMBER TS OM A 24 1/4 " BY — value 2
241 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
SI GX AL VOLTAGE AD JU STEO TO PRODUCE A NIGHLIGHT BRI GX TXE SS OF 20 FOOT CAMBER TS OM A 24 1/4 " BY — value 3
4 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

Other

MAXIMUM DC ANODE S GRID #3 VOLTAGE — value 1
3 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM DC ANODE S GRID #3 VOLTAGE — value 2
22500 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM DC GRID #2 VOLTAGE — value 1
2 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM DC GRID #2 VOLTAGE — value 2
500 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM GRID #i VOLTAGE
1 V
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM GR iD #1 CIRCUIT RESISTANCE — value 1
1 Mohm
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM GR iD #1 CIRCUIT RESISTANCE — value 2
1 Mohm
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.
MAXIMUM GR iD #1 CIRCUIT RESISTANCE — value 3
15 Mohm
Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.