Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Rectifier - Damper Diode ·BeamPower-Diode

50GY7A

Combination television tube integrating a damper diode and beam-power horizontal-output section, providing both line-deflection amplification and energy recovery.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
12FN
Socket code
-
Base pins
12
Nominal heater
50 V / 300 mA

Description

Duodecar diode plus beam-power tube used as a combined damper diode and horizontal-deflection amplifier in television receivers.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12FN
Socket code
-
Base pins
12
Nominal heater voltage
50 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12FN - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Max plate dissipation
3.8 W
Rectifier peak inverse voltage
4200 V
Rectifier nominal output current
135 mA
Rectifier peak forward current
810 mA
Rectifier forward voltage drop
21 V
Rectifier warm-up time
11 s

Damper diode unit; 21 V instantaneous drop at 250 mA.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
10000 Ω
Transconductance
0.0065 S
Amplification factor
4
Max plate voltage
400 V
Max screen voltage
150 V
Max plate dissipation
9 W
Max cathode current
155 mA

Horizontal-deflection beam-power unit; pulse plate rating is stored 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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Heater Voltage (ac/dc) 33.6

    50 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Heater Current 0.45

    300 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 33GY7A target datasheet entry; Section1

  • DC Plate Supply Voltage

    400 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Positive-Pulse Plate Voltage#

    5000 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Negative-Pulse Plate Voltage

    0 V

    Published in approved 33GY7A target datasheet entry; Section1

  • DC Grid-No.2 Voltage

    150 V

    Published in approved 33GY7A target datasheet entry; Section1

  • DC Grid-No.l Voltage

    -55 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Negative-Pulse Grid-No.l Voltage

    330 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Cathode Current

    540 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Average Cathode Current

    155 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Plate Dissipation!

    9 W

    Published in approved 33GY7A target datasheet entry; Section1

  • Grid-No. 1-Cireuit Resistance

    1 MΩ

    Published in approved 33GY7A target datasheet entry; Section1

  • # Pulse duration must not exceed 15</J of a horizontal scanning cycle (

    10 microseconds

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Inverse Plate VoJtage#

    4200 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak Plate Current

    810 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Average Plate Current

    135 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Plate Dissipation

    3.8 W

    Published in approved 33GY7A target datasheet entry; Section1

  • Peak value +200

    -4200 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Average value +100

    -400 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Bulb Temperature (At hottest point)

    200 °C

    Published in approved 33GY7A target datasheet entry; Section1

  • Tube Voltage Drop for plate current of

    250 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Tube Voltage Drop for plate current of 250 mA

    21 V

    Published in approved 33GY7A target datasheet entry; Section1

  • # Pulse duration must not exceed I5 r/r of a horizontal scanning cycle (

    10 microseconds

    Published in approved 33GY7A target datasheet entry; Section1

Characteristic

  • Plate Voltage 5000 60 130

    130 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage 0 —22.5

    -22.5 V

    Published in approved 33GY7A target datasheet entry; Section1

  • Plate Resistance (Approx.)

    10000 Ω

    Published in approved 33GY7A target datasheet entry; Section1

  • Plate Current 320*

    48 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • Grid-No.2 Current 22"

    2.9 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • current of

    1 mA

    Published in approved 33GY7A target datasheet entry; Section1

  • current of 1 mA -80

    -40 V

    Published in approved 33GY7A target datasheet entry; Section1

SECTION 2

Beam Power

Other

  • Heater Voltage (ac/dc) 33.6

    50 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Heater Current 0.45

    300 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 33GY7A target datasheet entry; Section2

  • DC Plate Supply Voltage

    400 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Positive-Pulse Plate Voltage#

    5000 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Negative-Pulse Plate Voltage

    0 V

    Published in approved 33GY7A target datasheet entry; Section2

  • DC Grid-No.2 Voltage

    150 V

    Published in approved 33GY7A target datasheet entry; Section2

  • DC Grid-No.l Voltage

    -55 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Negative-Pulse Grid-No.l Voltage

    330 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Cathode Current

    540 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Average Cathode Current

    155 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Plate Dissipation!

    9 W

    Published in approved 33GY7A target datasheet entry; Section2

  • Grid-No. 1-Cireuit Resistance

    1 MΩ

    Published in approved 33GY7A target datasheet entry; Section2

  • # Pulse duration must not exceed 15</J of a horizontal scanning cycle (

    10 microseconds

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Inverse Plate VoJtage#

    4200 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak Plate Current

    810 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Average Plate Current

    135 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Plate Dissipation

    3.8 W

    Published in approved 33GY7A target datasheet entry; Section2

  • Peak value +200

    -4200 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Average value +100

    -400 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Bulb Temperature (At hottest point)

    200 °C

    Published in approved 33GY7A target datasheet entry; Section2

  • Tube Voltage Drop for plate current of

    250 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Tube Voltage Drop for plate current of 250 mA

    21 V

    Published in approved 33GY7A target datasheet entry; Section2

  • # Pulse duration must not exceed I5 r/r of a horizontal scanning cycle (

    10 microseconds

    Published in approved 33GY7A target datasheet entry; Section2

Characteristic

  • Plate Voltage 5000 60 130

    130 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Voltage 130 130 130

    130 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage 0 —22.5

    -22.5 V

    Published in approved 33GY7A target datasheet entry; Section2

  • Plate Resistance (Approx.)

    10000 Ω

    Published in approved 33GY7A target datasheet entry; Section2

  • Plate Current 320*

    48 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • Grid-No.2 Current 22"

    2.9 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • current of

    1 mA

    Published in approved 33GY7A target datasheet entry; Section2

  • current of 1 mA -80

    -40 V

    Published in approved 33GY7A target datasheet entry; Section2