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5915

Miniature dual-control heptode for computer, control, and switching applications, using separate control grids for logic, gating, and industrial control functions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CH
Socket code: B9A
Base pins: 7
Nominal heater: 6.3 V / 300 mA

Description

Miniature dual-control heptode intended for control applications.

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: 7CH
Socket code: B9A
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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: 0.002 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 1 W
Max screen dissipation: 1 W
Max cathode current: 20 mA

Published ratings and characteristics promoted where applicable; additional source-table values 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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate supply voltage
150 V
Open
Screen-grid supply voltage
75 V
Open
Plate current minimum
5 mA
Open
Plate current maximum
6.5 mA
Open
Plate supply voltage
150 V
Blocked
Screen-grid supply voltage
75 V
Blocked
Plate current maximum
0.2 mA
Blocked
Plate cold voltage
550 V
Screen-grid cold voltage
550 V
Control-grid minimum voltage
-100 V
Suppressor-grid minimum voltage
-100 V
Heater-to-cathode voltage
120 V

Capacitance

Input capacitance control-grid
5.6 pF
Input capacitance screen-grid
6.8 pF
Output capacitance
8.3 pF
Control-grid to plate capacitance maximum
0.07 pF
Screen-grid to plate capacitance maximum
0.35 pF

Data set 02

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristics

Voltage
6.3 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Current
300 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Electrodes and Heater
5.4
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Electrodes and Heater
6.9
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Electrodes and Heater
7.6
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 1
67.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 2
67.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grids-No.2 and No.4 Voltage — published value 1
67.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grids-No.2 and No.4 Voltage — published value 2
67.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.3 Voltage — published value 1
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.3 Voltage — published value 2
-4 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.l Voltage — published value 1
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.l Voltage — published value 2
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance
2000
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance
1100
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 1 —Grid No.l — published value 1
1
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 1 —Grid No.l — published value 2
5
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 2 -Cathode, — published value 1
2
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 2 -Cathode, — published value 2
6
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 3 —Heater — published value 1
3
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 3 —Heater — published value 2
7
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 4 -Heater
4
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
GRID—No."1 SUPPLY VOLTAGE
1 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
DC CATHODE CURRENT
20 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 1
150 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 2
150 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 3
150 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 1
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 2
10 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 3
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Supply Voltage — published value 1
75 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Supply Voltage — published value 2
75 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Supply Voltage — published value 3
75 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 1
10 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 2
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 3
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 1
20000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 2
20000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 3
20000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 1
47000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 2
47000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Resistance — published value 3
47000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 1
0 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 2
0 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 3
5.8 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grids—No.2 6 Na.4
6
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Current — published value 1
0 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Current — published value 2
14 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Current — published value 3
9 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current
0.2 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 1
2 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 2
5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Current — published value 3
6.5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Note Ia
6.3 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
on neater, plate—supply volts = 150, grid-No.3 supply volts =
150 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
0, grids—No.2 6 No.4 sup Ply volts = 75, grl d—No.1 suDPly.volts — published value 1
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
0, grids—No.2 6 No.4 sup Ply volts = 75, grl d—No.1 suDPly.volts — published value 2
6 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
0, grids—No.2 6 No.4 sup Ply volts = 75, grl d—No.1 suDPly.volts — published value 3
75 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
— —10, plate—Circuit resistance (ohms) = 20000, grid—No.3 cl rcuit — published value 1
10 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
— —10, plate—Circuit resistance (ohms) = 20000, grid—No.3 cl rcuit — published value 2
20000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
r e515t once (Ohm S) = 47000, grid 5—N0.2 8 No.4 series rest 5tOr — published value 1
47000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
r e515t once (Ohm S) = 47000, grid 5—N0.2 8 No.4 series rest 5tOr — published value 2
5 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
r e515t once (Ohm S) = 47000, grid 5—N0.2 8 No.4 series rest 5tOr — published value 3
8 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
r e515t once (Ohm S) = 47000, grid 5—N0.2 8 No.4 series rest 5tOr — published value 4
5 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
(ohms) = 470, and grid xo. 1—circuit resistance (ohms) = 47000 — published value 1
470 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
(ohms) = 470, and grid xo. 1—circuit resistance (ohms) = 47000 — published value 2
1 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
(ohms) = 470, and grid xo. 1—circuit resistance (ohms) = 47000 — published value 3
47000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
same as /or Mate la exc epi Lhat grid—No.3 Supply vo1L5 = —10
10 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.

Other

Grid No.i to Plate
0.08 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid No.3 to Plate
0.35 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid No.l to Grid No.3. 0.15 max
0.15 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
PLATE VOLTAGE
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
GRIDS—No.2 and No.4 SUPPLY VOLTAGE
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Negative bias value
100 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Positive bias value
0 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
GRIDS—No.2 and No.4 INPUT
1 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
PEAK CATHODE CURRENT
70 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater negative with respect to cathode
90 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater positive with respect to cathode
90 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
For fixed-bias operation — published value 1
0 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
For fixed-bias operation — published value 2
5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
for cathode-bias operation — published value 1
1 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
for cathode-bias operation — published value 2
0 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.