4678

Visual tuning indicator combining a triode amplifier with a fluorescent cathode-ray display whose luminous pattern varies with tuning-control voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 200 mA

Description

A visual tuning indicator combining a triode amplifier with a fluorescent cathode-ray display whose luminous pattern changes with tuning-control voltage.

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: 6.3 V
Nominal heater current: 200 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 100000 Ω
Transconductance: 0.00065 S
Amplification factor: 65
Max plate voltage: 350 V

Representative active triode section; cathode-ray indicator values retained as parameters.

Section 2

Tuning Indicator

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Supply voltage
250 V
Triode anode load resistance
2 MOhm

Characteristic

Triode anode current
120 uA
Vg=0V
Triode anode current
30 uA
Vg=-4V
Indicator screen current
0.28 mA
Vg=0V
Indicator screen current
0.26 mA
Vg=-4V