3FH5

High-transconductance miniature triode for VHF RF-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 3 V / 450 mA

Description

High-transconductance miniature triode for VHF RF-amplifier service.

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 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

Plate resistance: 5600 Ω
Transconductance: 0.009 S
Amplification factor: 50
Max plate voltage: 150 V
Max plate dissipation: 2.2 W
Max cathode current: 22 mA

Promoted values are from the supplied Westinghouse family sheet; additional published ratings, characteristics and operating points 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

Capacitance

GRID TO PLATE: G TO P (MAX.) (ROGEY) — 0.52 —*
0.52 PF
Published datasheet value
INPUT: G TO (H+K+(.S.) 3.2
3.2 PF
Published datasheet value

Other

MAXIMUM PLATE VOLTAGE
150 VOLTS
Published datasheet value
MAXIMUM DC CATHODE CURRENT
22 MA
Published datasheet value
HEATER WARM-UP TIME (APPROX.)*
11 SECONDS
Published datasheet value
PLATE VOLTAGE
135 VOLTS
Published datasheet value
GRID VOLTAGE
-1 VOLT
Published datasheet value

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
135 V
Grid voltage
-1 V
Plate current
11 mA

Characteristics

Plate resistance
5600 Ohm
Transconductance
9000 uS
Amplification factor
50 ratio
Control-grid cutoff voltage
-5.5 V

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
135 V
VHFRFAmplifier
Plate current
11 mA
VHFRFAmplifier
Application
High-frequency RF amplifier
Section1

Characteristic

Plate resistance
5600 Ω
Section1
Transconductance
9000 µS
Section1
Amplification factor
50
Section1
Grid voltage at 100 uA plate current
-5.5 V
Section1
Heater warm-up time
11 s
Section1