6FR7

Dissimilar dual triode designed for television vertical-deflection service, combining an oscillator section with a high-current output amplifier rated for substantial positive plate pulses.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: 9
Nominal heater: 9.7 V / -

Description

Dissimilar dual triode featuring oscillator and amplifier sections for vertical-deflection service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 9
Nominal heater voltage: 9.7 V
Nominal heater current: -
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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 1500 V

Electrical section extracted from supplied datasheet.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Max plate voltage: 1500 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 2

Triode

Characteristic

Heater Voltage 9.7 13.0 6.31 Volts 361362
6.31 V
Heater Voltage 9.7 13.0 6.31 Volts 361362
Heater Current 2 600! 4501 925 Ma 3 75?
925 mA
Heater Current 2 600! 4501 925 Ma 3 75?
Heater Voltage - - - - 5.7-6.9 Volts 1002 Dia.
-6.9 V
Heater Voltage - - - - 5.7-6.9 Volts 1002 Dia.
Plate Voltage 250 150 Volts
150 V
Plate Voltage 250 150 Volts
Grid No. 1 Voltage -3 -~20 Volts
20 V
Grid No. 1 Voltage -3 -~20 Volts
Plate Current 1.4 50 Ma
50 mA
Plate Current 1.4 50 Ma
Transconductance 1600 7200 umhos
7200 umhos
Transconductance 1600 7200 umhos
Plate Resistance (Approx.) 40,000 750 Ohms
750 Ohms
Plate Resistance (Approx.) 40,000 750 Ohms

Other

Plate Voltage 330 330 Volts Max.
330 V
Plate Voltage 330 330 Volts Max.
Pecak Positive Pulse Plate Voltage - 1500 Volts Max,
1500 V
Pecak Positive Pulse Plate Voltage - 1500 Volts Max,
Peak Negative Pulse Grid Voltage 400 250 Volts Max.
250 V
Peak Negative Pulse Grid Voltage 400 250 Volts Max.
Plate Dissipation6 1.5 10 Watts Max.
10 W
Plate Dissipation6 1.5 10 Watts Max.
Average Cathode Current 22 50 Ma Max.
50 mA
Average Cathode Current 22 50 Ma Max.
Pealt Cathode Current 77 175 Ma Max.
175 mA
Pealt Cathode Current 77 175 Ma Max.