CV784

Receiving diode-pentode intended for radio IF amplification, detection, and control functions, with the pentode providing gain and the diode furnishing signal rectification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 50 mA

Description

Commercial-equivalent designation explicitly printed for the 1S5 miniature battery diode-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

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

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

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 600000 Ω
Transconductance: 0.000625 S
Max plate voltage: 90 V
Max screen voltage: 90 V
Max cathode current: 3 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 2

Pentode

Other

Plate Voltage
67.5 V
PentodeSection
Plate Current
1.6 mA
PentodeSection
Screen Voltage
67.5 V
PentodeSection
Screen Current
0.4 mA
PentodeSection

Characteristic

Transconductance
625 µS
PentodeSection
Plate Resistance
600000 ohm
PentodeSection