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Power - TV Vertical Output ·Triode-Triode

8CY7

Dissimilar dual triode with controlled heater warm-up for television vertical-deflection service. A high-mu oscillator section generates the sweep while the low-mu high-current output section handles deflection power and substantial pulse voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9EF
Socket code: B9A
Base pins: 9
Nominal heater: 7.9 V / 600 mA

Description

The 8CY7 is a dissimilar double triode intended for combined vertical-deflection oscillator and amplifier service in television receivers, with controlled heater warm-up.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9EF
Socket code: B9A
Base pins: 9
Nominal heater voltage: 7.9 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9EF - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	B	P — Plate (Anode) Original chart label: 2P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN3Base Pin	B	G1 — Control Grid Original chart label: 2G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN6Base Pin	A	P — Plate (Anode) Original chart label: 1P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN7Base Pin	A	G1 — Control Grid Original chart label: 1G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN8Base Pin	A	K — Cathode Original chart label: 1K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF
PIN9Base Pin	B	K — Cathode Original chart label: 2K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EF

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 52000 Ω
Transconductance: 0.0013 S
Amplification factor: 68
Max plate voltage: 350 V
Max plate dissipation: 1 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Published promoted fields populated semantically; identical repeated sections compressed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 920 Ω
Transconductance: 0.0054 S
Amplification factor: 5
Max plate voltage: 350 V
Max plate dissipation: 5.5 W
Max cathode current: 35 mA
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Section 2 vertical-deflection amplifier; 1800 V pulse limit retained as parameter.

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

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate_voltage
250 V
TVVerticalDeflection,Oscillator
Grid_voltage
-3 V
TVVerticalDeflection,Oscillator

Characteristic

Amplification_factor
68
TVVerticalDeflection,Oscillator
Plate_resistance
52000 ohm
TVVerticalDeflection,Oscillator
Transconductance
1300 uS
TVVerticalDeflection,Oscillator
Plate_current
1.2 mA
TVVerticalDeflection,Oscillator

Capacitance

Grid-to-plate capacitance
1.8 pF
Input capacitance
1.5 pF
Output capacitance
0.3 pF

SECTION 2

Triode

Other

Maximum_peak_positive_plate_voltage
1800 V
Maximum_peak_cathode_current
120 mA
Plate_voltage
150 V
TVVerticalDeflection
Cathode_bias_resistor
620 ohm
TVVerticalDeflection
Heater_warmup_time
11 s
TVVerticalDeflection

Characteristic

Amplification_factor
5
TVVerticalDeflection
Plate_resistance
920 ohm
TVVerticalDeflection
Transconductance
5400 uS
TVVerticalDeflection
Plate_current
30 mA
TVVerticalDeflection

Capacitance

Grid-to-plate capacitance
4.4 pF
Input capacitance
5 pF
Output capacitance
1 pF

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
7.9 V
HeaterCurrentNominal
600 mA

Characteristic

Plate Resistance
52000 Ohm
Transconductance
1300 uS
Amplification Factor
68

SECTION 2

Triode

Characteristic

Plate Resistance
920 Ohm
Transconductance
5400 uS
Amplification Factor
5

Other

Peak Positive Pulse Plate Voltage
1800 V
VerticalDeflection
Peak Cathode Current
120 mA
VerticalDeflection