3FY5

Remote-cutoff frame-grid shielded triode for low-noise VHF television-tuner service around 220 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 3.1 V / 450 mA

Description

Remote-cutoff frame-grid shielded triode for low-noise VHF television tuner service around 220 MHz.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: 7
Nominal heater voltage: 3.1 V
Nominal heater current: 450 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.013 S
Amplification factor: 70
Max plate voltage: 200 V
Max plate dissipation: 2.2 W
Max cathode current: 20 mA

Promoted only where the locked schema has a direct semantic match; additional published receiving-tube, pulse, rectifier, capacitance, and transmitting-tube values are retained in TUBE_SECTION_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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

MAXIMUM PLATE VOLTAGE
200 VOLTS
Published datasheet value
MAXIMUM PLATE VOLTAGE (ZERO PLATE CURRENT)
550 VOLTS
Published datasheet value
MAXIMUM CATHODE CURRENT
20 MA
Published datasheet value
MAXIMUM NEGATIVE GRID VOLTAGE
50 VOLTS
Published datasheet value
PLATE VOLTAGE 135 13H 135
136 VOLTS
Published datasheet value
PLATE CURRENT 11
0.1 MA
Published datasheet value

Data set 02

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
135 V
RFAmplifier
Control-grid voltage
-4.5 V
RFAmplifier
Plate current
11 mA
RFAmplifier

Characteristic

Transconductance
13000 µS
Section1
Amplification factor
70
Section1

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Input capacitance
4.75 pF
Section1
Output capacitance
3.3 pF
Section1
Grid-to-heater capacitance maximum
0.28 pF
Section1
Plate-to-cathode capacitance
0.25 pF
Section1
Grid-to-cathode capacitance
3.2 pF
Section1
Cathode-to-heater capacitance
2.5 pF
Section1

Other

Zero-current plate voltage maximum
550 V
Section1
Plate voltage
135 V
VHFTuner
Plate current
11 mA
VHFTuner
Application
Remote-cutoff frame-grid VHF tuner amplifier; controlled for low noise at 220 MHz
Section1

Characteristic

Amplification factor
70
Section1