6664

High-mu triode for mobile-communications amplifier and oscillator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7BD
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 150 mA

Description

High-mu triode for mobile-communications amplifier and oscillator 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: 7BD
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN2G3	A	G3 — Suppressor GridGroup 7BD2 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN2IS	A	IS — Internal ScreenGroup 7BD2 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN2K	A	K — CathodeGroup 7BD2 EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN3H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN5P	A	P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN6G2	A	G2 — Screen Grid EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN7G3	A	G3 — Suppressor GridGroup 7BD7 EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN7IS	A	IS — Internal ScreenGroup 7BD7 EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD
PIN7K	A	K — CathodeGroup 7BD7 EIA chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BD

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 10900 Ω
Transconductance: 0.0055 S
Amplification factor: 60
Max plate voltage: 330 V
Max plate dissipation: 2.9 W
Max cathode current: 12 mA

Alias/co-designation of 6AB4;

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
180 V
Published handbook rating
Maximum screen voltage
125 V
Published handbook rating
Plate voltage
120 V
ClassA
Screen voltage
120 V
ClassA
Plate current
7.5 mA
ClassA
Screen current
2.5 mA
ClassA

Characteristic

Plate resistance
340000 ohm
Published handbook characteristic
Transconductance
5000 µS
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
175 mA
Published heater/filament rating

Capacitance

Input capacitance
4 pF
Published capacitance column
Output capacitance
2.9 pF
Published capacitance column
Grid-to-plate capacitance
0.02 pF
Published capacitance column

Data set 02

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Nominal
Heater current
150 mA
Nominal
Maximum plate voltage
330 V
Promoted published value
Maximum plate dissipation
2.9 W
Promoted published value
/^~ Voltage (AC or DC)
6.3 V
Heater Characteristics and Ratings (Absolute-Maximum Valuesl:
Current at heater volts =
150 V
Heater Characteristics and Ratings (Absolute-Maximum Valuesl:
respect to cathode
100 V
Heater Characteristics and Ratings (Absolute-Maximum Valuesl:
PLATE VOLTAGE
330 V
Maximum Ratings, Absolute -Maximum Values:
PLATE DISSIPATION
2.9 W
Maximum Ratings, Absolute -Maximum Values:
to voltage variations as great as t
20 V
Maximum Ratings, Absolute -Maximum Values:
With heater volts =
250 V
Maximum Ratings, Absolute -Maximum Values:
cathode resistor (ohms) bypassed =
200 ohm
Maximum Ratings, Absolute -Maximum Values:

Characteristic

Plate resistance
10900 ohm
Promoted published value
Transconductance
5500 uS
Promoted published value
Amplification factor
60
Promoted published value
Plate Supply Voltage
250 V
Characteristics, Clasa A I ,Ampl ifier:
Cathode Resistor
200 ohm
Characteristics, Clasa A I ,Ampl ifier:
Plate Resistance (Approx )
10900 ohm
Characteristics, Clasa A I ,Ampl ifier:
Transconductance
5500 uS
Characteristics, Clasa A I ,Ampl ifier:
Plate Current
10 mA
Characteristics, Clasa A I ,Ampl ifier:
r ' for plate µa =
-12 V
Characteristics, Clasa A I ,Ampl ifier: