CV782

Low-consumption battery heptode for oscillator and frequency-converter service in portable superheterodyne receivers. Its economical directly heated filament minimizes battery drain while providing useful conversion performance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 50 mA

Description

Commercial-equivalent designation explicitly printed for the 1R5 variable-mu battery heptode frequency changer.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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: 600000 Ω
Transconductance: 0.0003 S
Max plate voltage: 90 V
Max screen voltage: 67.5 V
Max cathode current: 5.5 mA

Published ratings and characteristics promoted semantically from source; repeated identical physical sections compressed where applicable.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Plate Voltage
90 V
Plate Current
1.6 mA
Screen Voltage
67.5 V
Screen Current
3.2 mA

Characteristic

Plate Resistance
600000 ohm
Conversion Conductance
300 µS
Operating Frequency Maximum
20 MHz