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Tuning Indicator ·Triode-TuningIndicator

EM1

Philips electron-ray tuning indicator with integral control triode and fluorescent display for visual receiver tuning or signal-strength indication.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 200 mA

Description

EM1 is listed in the supplied valve table as a electron-ray tuning indicator. Published operating and characteristic values were transcribed from its target row.

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

No fixed ratings are recorded for this section.

Published target-row operating and characteristic values reviewed.

Section 2

Tuning Indicator

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Fluorescent tuning indicator with integral control triode

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    250 V

    Published table operating point

  • Plate current

    0.095 mA

    Published table operating point

  • Control-grid bias

    5 V

    Published table operating point

  • Target supply voltage

    250 V

    TuningIndicator

  • Target current

    0.095 mA

    TuningIndicator

Characteristic

  • Heater/filament voltage

    6.3 V

    Published heater/filament rating

  • Heater/filament current

    200 mA

    Published heater/filament rating

  • Grid voltage closed indication

    0 V

    TuningIndicator

  • Grid voltage open indication

    5 V

    TuningIndicator

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Triode anode series resistance

    2 MΩ

    Section1

SECTION 2

Tuning Indicator

Other

  • Fluorescent screen voltage

    250 V

    Section2

  • Alternative fluorescent screen voltage

    200 V

    Section2