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Voltage Pentode - Sharp Cutoff (single) ·Pentode

7732

Sharp-cutoff pentode designed for high-input-impedance instrumentation applications as a specialized replacement for the 6CB6.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
E7-1 / 7CM
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 300 mA

Description

Sharp-cutoff pentode for high-input-impedance instrumentation applications; replacement for 6CB6.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E7-1 / 7CM
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E7-1 / 7CM - 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
600000 Ω
Transconductance
0.006 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
2.3 W
Max screen dissipation
0.55 W

Sharp-cutoff 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

1960 CBS Hytron

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid-to-plate capacitance maximum

    0.025 pF

    NoShield

  • Input capacitance

    6.5 pF

  • Output capacitance

    2.6 pF

    NoShield

Other

  • Plate voltage

    250 V

    ClassA

  • Screen-grid voltage

    150 V

    ClassA

  • Cathode bias resistor

    200 Ohm

    ClassA

Characteristics

  • Plate current

    8.5 mA

  • Screen-grid current

    2.5 mA