4GM6

Semi-remote-cutoff pentode designed for television IF amplifier service with automatic gain control. Its gradual cutoff characteristic allows controlled wideband gain as received television signal strength changes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7M
Socket code: B7G
Base pins: 7
Nominal heater: 4.2 V / 600 mA

Description

Semi-remote-cutoff pentode for television IF amplifier service with AGC.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7M
Socket code: B7G
Base pins: 7
Nominal heater voltage: 4.2 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7M - 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: 200000 Ω
Transconductance: 0.013 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 1.7 W
Max screen dissipation: 0.65 W

Gain-controlled 40-MHz picture-IF pentode.

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

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

GRID #
0.036 ΜΜF
Capacitances | GRID #1 TO PLATE (MAX.) 0.036 µµf
PLATE TO CATHODE S INTERNAL SHIELD d. G
2.4 ΜΜF
Capacitances | PLATE TO CATHODE S INTERNAL SHIELD d. G3. G2 8~ H. 2.4 µµf

Characteristic

FOR GRID #
165 V
ClassA | FOR GRID #2 VOLTAGES UP TO 165 VOLTS 0.65 wart
HEATER WARM—UP TY ME (APPROX.)*
11 s
ClassA | HEATER WARM—UP TY ME (APPROX.)* 11.0 SECONDS
HEATER VOLTAGE
4.2 V
ClassA | HEATER VOLTAGE 4.2 VOLTS
PLATE SUPPLY VOLTAGE
5 V
ClassA | PLATE SUPPLY VOLTAGE 1'L5 VOLTS
CATHODE RESISTOR
56 ohm
ClassA | CATHODE RESISTOR 56 OHMS
PLATE RESISTANCE (APPROX.) O
2 Mohm
ClassA | PLATE RESISTANCE (APPROX.) O.2 MEGOHMS
PLATE CURRENT L
4 mA
ClassA | PLATE CURRENT L4 MA.
GRID #
4 mA
ClassA | GRID #2 CURRENT j.4 MA.

Data set 02

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
125 V
IFAmplifier;40MHz
Grid 2 voltage
125 V
IFAmplifier;40MHz
Cathode resistor
56 ohm
IFAmplifier;40MHz
Plate current
14 mA
IFAmplifier;40MHz
Grid 2 current
3.4 mA
IFAmplifier;40MHz

Characteristic

Plate resistance
200000 ohm
IFAmplifier;40MHz
Transconductance
13000 uS
IFAmplifier;40MHz
Grid 1 cutoff reference voltage
-15 V
IFAmplifier;40MHz
Heater warm-up time
11 s
ControlledWarmUp