CV785

Service designation explicitly associated with the 1T4 variable-mu miniature battery RF pentode. It provides controlled RF/IF gain using a low-power directly heated filament suitable for portable equipment.

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 1T4 variable-mu miniature battery RF pentode.

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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 500000 Ω
Transconductance: 0.0009 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

Pentode

Other

Plate Voltage
90 V
Plate Current
3.5 mA
Screen Voltage
67.5 V
Screen Current
1.4 mA

Characteristic

Transconductance
900 µS
Plate Resistance
500000 ohm