3HT6

Semi-remote-cutoff pentode designed for AGC-controlled television IF amplifier stages. Its gradual cutoff characteristic provides useful gain regulation while handling wideband television intermediate-frequency signals.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 3.15 V / 600 mA

Description

Semi-remote-cutoff pentode for AGC-controlled television IF amplifier stages.

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: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 3.15 V
Nominal heater current: 600 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 143000 Ω
Transconductance: 0.014 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.55 W
Max cathode current: 25 mA
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

Published promoted fields populated by semantic headings; identical repeated sections compressed.

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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
125 V
Screen-grid voltage
125 V
Cathode bias resistor
56 Ohm
Plate current
15 mA
Screen-grid current
4 mA

Characteristics

Plate resistance
143000 Ohm
Transconductance
14000 uS

Capacitance

Grid-to-plate capacitance
0.024 pF
Shielded
Input capacitance
8.7 pF
Shielded
Output capacitance
3 pF
Shielded

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
125 V
IFAmplifier
Screen voltage
125 V
IFAmplifier
Cathode-bias resistor
56 Ω
IFAmplifier
Plate current
15 mA
IFAmplifier
Screen current
4 mA
IFAmplifier

Characteristic

Transconductance
14000 µS
Section1
Plate resistance
0.143 MΩ
Section1
Grid-1 cutoff bias at 50 uS
-6.7 V
Section1
Transconductance at -1.5 V
12000 µS
Section1
Transconductance at -3.6 V
300 µS
Section1
Hot input resistance at 44 MHz
12700 Ω
Section1

Capacitance

Hot input capacitance at 44 MHz
7.45 pF
Section1