CV408

High-frequency triode for grounded-grid amplification, low-noise amplification, oscillation, or frequency multiplication in VHF/UHF equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 7
Nominal heater: 6.3 V / 490 mA

Description

A triode with planar electrodes for use as an RF oscillator at frequencies up to 1000 Mc/s or as a low-noise amplifier at frequencies up to about 300 Mc/s. The A1714 is a commercial equivalent of CV408.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 490 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0085 S
Amplification factor: 45
Max plate voltage: 250 V
Max plate dissipation: 2.5 W
Max grid dissipation: 0.1 W
Max cathode current: 45 mA

Explicit commercial-equivalent designation on A1714 datasheet.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

up to
1000 MHz
up to 1000 Mc/s or as a low noise amplifier at frequencies up to about
300 MHz
Vh-k(pk)
90 V
MAXIMUM RATINGS (Design centre)
rin (
45 MHz
a subsidiary of THE GENERAL ELECTRIC CO LTD OF ENGLAND
cg-all (
45 MHz
a subsidiary of THE GENERAL ELECTRIC CO LTD OF ENGLAND
cg-all (45 Mc/s)
5 pF
a subsidiary of THE GENERAL ELECTRIC CO LTD OF ENGLAND
Noise factor (
45 MHz
a subsidiary of THE GENERAL ELECTRIC CO LTD OF ENGLAND
Noise factor (45 Mc/s)
1.9 dB
a subsidiary of THE GENERAL ELECTRIC CO LTD OF ENGLAND

Characteristic

ca-g
0.9 pF
CAPACITANCES (of unscreened valve)
Ca-all less g
1.3 pF
CAPACITANCES (of unscreened valve)
tCg-all less a
3 pF
CAPACITANCES (of unscreened valve)
+Measured at
1 MHz
CAPACITANCES (of unscreened valve)