UM84

Series-heater tuning indicator with amplifying triode, designed for receiver tuning or modulation-control service with a sensitive fluorescent visual display.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: -
Nominal heater: 12 V / 100 mA

Description

UM84 is a TuningIndicator device in the supplied Philips literature. Indicator tube with amplifying triode for tuning indication or modulation-control service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: -
Nominal heater voltage: 12 V
Nominal heater current: 100 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

Max plate voltage: 250 V
Max plate dissipation: 0.5 W

Indicator tube with amplifying triode for tuning indication or modulation-control service.

Section 2

Tuning Indicator

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V

Indicator tube with amplifying triode for tuning indication or modulation-control service.

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

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Supply voltage
170 V
TriodeSection
Anode/display resistor
470 kOhm
TriodeSection
Grid resistor
3 MOhm
TriodeSection
Grid voltage
0 V
TriodeSection
Plate-plus-display current
0.3 mA
TriodeSection; GridVoltage=0V
Grid voltage
-15 V
TriodeSection
Plate-plus-display current
0.04 mA
TriodeSection; GridVoltage=-15V

SECTION 2

Tuning Indicator

Other

Indicator current
0.6 mA
IndicatorSection; GridVoltage=0V
Indicator current
1.05 mA
IndicatorSection; GridVoltage=-15V
Shadow length
15 to 25 mm
GridVoltage=0V
Shadow length
0 mm
GridVoltage=-15V

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 2

Tuning Indicator

Characteristics

Caractéristiques d'utilisation (D relié a 1'anode)
1 a
Caractéristiques d'utilisation (D relié a 1'anode)