Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Radio Detector Converter ·Heptode

707

Receiver oscillator-converter combining local oscillation and signal mixing for superheterodyne frequency conversion. Its multi-grid structure integrates the front-end frequency-changing functions in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
8AL
Socket code
B8G
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

707 is listed/represented in the supplied handbook batch as a pentagrid converter (printed designation OCRs as 7Q7/707).

Socket description

Loctal 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8AL
Socket code
B8G
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8AL - 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

Heptode

X-ray radiationInterelectrode capacitances
Plate resistance
1000000 Ω
Transconductance
0.00055 S
Max plate voltage
300 V
Max screen voltage
100 V

Published handbook ratings and representative operating characteristics reviewed.

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

  • Maximum plate voltage

    300 V

    Published handbook rating

  • Maximum screen voltage

    100 V

    Published handbook rating

  • Plate voltage

    250 V

    ClassA

  • Screen voltage

    100 V

    ClassA

  • Control-grid bias

    2 V

    ClassA

  • Plate current

    3.5 mA

    ClassA

  • Screen current

    8.5 mA

    ClassA

Characteristic

  • Plate resistance

    1000000 ohm

    Published handbook characteristic

  • Transconductance

    550 µS

    Published handbook characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    300 mA

    Published heater rating