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Voltage Radio Detector Converter ·Heptode

3BY6

Multi-grid heptode for specialized receiving and signal-processing service. Separate control grids permit mixer and converter-type operation, allowing multiple signals or control voltages to influence plate current.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CH
Socket code: B7G
Base pins: 7
Nominal heater: 3.15 V / 600 mA

Description

3BY6 is described in the supplied Tung-Sol datasheet as a controlled-warm-up gated-amplifier heptode equivalent to 6BY6. Published electrical ratings and operating characteristics were extracted from the supplied source.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CH
Socket code: B7G
Base pins: 7
Nominal heater voltage: 3.15 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: Yes

7CH - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2G5	A	G5 — Fifth GridGroup 7CH2 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2K	A	K — CathodeGroup 7CH2 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN3H	—	H — Heater Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN4H	—	H — Heater Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN5P	A	P — Plate (Anode) Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G2	A	G2 — Screen GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G4	A	G4 — Fourth GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN7G3	A	G3 — Suppressor Grid Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH

Section ratings

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0019 S
Max plate voltage: 330 V
Max screen voltage: 150 V
Max plate dissipation: 2.3 W
Rectifier max heater-cathode voltage: 200 V
Rectifier warm-up time: 11 s

RCA and Tung-Sol 3BY6 dual-control heptode/pentagrid gated amplifier for color television sync separation and clipping. Heater 3.15 V, 600 mA, controlled warm-up ~11 s in series-heater TV receivers. Maximum plate voltage 330 V, plate dissipation 2.3 W, screen-grid No.2+No.4 supply 330 V; actual screen voltages and power are limited by conditional rating charts, not simply the 330 V supply. Typical gated-amplifier operating point: plate 250 V, grids 2 and 4 supply 100 V, grid 3 -2.5 V, grid 1 -2.5 V; grid-1-to-plate gm 1900 µmhos (0.0019 S), distinct grid-3-to-plate gm 500 µmhos (0.0005 S), plate current 6.5 mA and screen current 9 mA. Screen max voltage field of 150 V retained as approved. Capacitances documented. Neither conversion conductance nor the separate control-grid gm should be conflated.

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

Heptode

Other

Plate voltage
250 V
GatedAmplifier;Grid3=-2.5V
Screen-grid voltage
100 V
GatedAmplifier;Grid3=-2.5V
Grid No.1 bias
2.5 V
GatedAmplifier;Grid3=-2.5V
Plate current
6.5 mA
GatedAmplifier;Grid3=-2.5V
Screen-grid current
9 mA
GatedAmplifier;Grid3=-2.5V
Transconductance
1900 uS
GatedAmplifier;Grid3=-2.5V
Plate voltage
10 V
GatedAmplifier;Grid3=0V
Screen-grid voltage
25 V
GatedAmplifier;Grid3=0V
Grid No.1 bias
0 V
GatedAmplifier;Grid3=0V
Plate current
1.4 mA
GatedAmplifier;Grid3=0V
Screen-grid current
3.5 mA
GatedAmplifier;Grid3=0V

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Warmup Time
11 s
GatedAmplifierService

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater voltage
3.15 V
Published heater rating
Heater current
600 mA
Published heater rating

Capacitance

Grid 1 to plate capacitance
0.08 pF
Published
Grid 3 to plate capacitance
0.35 pF
Published
Grid 1 to grid 3 capacitance
0.22 pF
Published

Other

Maximum plate voltage
330 V
GatedAmplifier
Maximum grids 2 and 4 supply voltage
330 V
GatedAmplifier
Maximum negative grid 3 voltage
-55 V
GatedAmplifier

Data set 04

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

Current — published value 1
0
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Current — published value 2
600
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Current — published value 3
0.04
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Voltage (ac or dc) at 0.600 A — published value 1
0 V
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Voltage (ac or dc) at 0.600 A — published value 2
0.6 V
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Voltage (ac or dc) at 0.600 A — published value 3
3.15 V
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Warm-up Time (Average)
11
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Heater~athode Voltage — published value 1
0 V
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Heater~athode Voltage — published value 2
0 V
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Current — published value 1
0.6
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.
Current — published value 2
0.04
Published datasheet value; multiple numbers on a row represent separate source limits or conditions.