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1910

Philips current-regulator ballast tube designed to maintain approximately 1.4 A over a 5–15 V operating range.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: -

Description

1910 Current Regulator

The 1910 is a current regulator (also designated as Régulateur de courant or Stromregler) designed to maintain a stable current of approximately 1.4 A across a regulating voltage range of 5 V to 15 V.

Physical Construction and Base Configurations

The device is constructed with a tubular glass envelope. Its physical dimensions are characterized by a maximum diameter of 35 mm and a maximum height (excluding pins) of 92 mm. The pins have a maximum length of 18 mm, resulting in a maximum overall length of 110 mm.

The 1910 is documented with two different base configurations:

3-pin base (type 40465): The filament ( $f$ ) is connected to pins 1 and 4, while pins 2 and 3 are connected together internally.
2-pin base: The pinout diagram shows two active terminals designated as 'f' and 'f' connected directly to the internal regulating element.

Electrical Operating Characteristics and Tolerances

The primary function of the 1910 is current regulation. It operates over a regulating voltage range of 5 V to 15 V with a nominal regulated current of 1.4 A (or 1.400 A). To account for tube-to-tube variations, the following current tolerances are specified at key voltage points:

Voltage	Minimum Current	Maximum Current
5 V	1.3 A	1.5 A
8.5 V	1.35 A	1.5 A
15 V	1.35 A	1.5 A

Regulation Curve Behavior

The current ( $I$ ) versus voltage ( $V$ ) characteristic curve demonstrates excellent regulation across the entire 5 V to 15 V operating range. The curve is extremely flat, maintaining a regulated current of approximately 1.40 A to 1.42 A.

Depending on the specific device configuration, the curve exhibits minor variations:

In some cases, the current is approximately 1.38 A at 5 V, rising slightly to a peak of approximately 1.41 A between 9 V and 10 V, before settling back to 1.40 A at 15 V.
In other cases, the curve shows a very slight peak around 7 V to 8 V and a minor upward trend as it approaches 15 V.

Technical Summary

Parameter	Value
Device Type	Current Regulator (Régulateur de courant / Stromregler)
Nominal Regulated Current	1.4 A
Regulating Voltage Range	5 to 15 V
Maximum Diameter	35 mm
Maximum Height (excluding pins)	92 mm
Maximum Overall Length	110 mm

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: -
Nominal heater current: -
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

Ballast

X-ray radiationInterelectrode capacitances

Regulator minimum current: 1.35 A
Regulator maximum current: 1.5 A
Regulator maintaining voltage: 8.5 V

Published ratings and characteristics promoted semantically from the approved Philips source.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Ballast

Characteristic

Nominal Regulating Current
1.4 A
Operating Voltage Minimum
5 V
Operating Voltage Maximum
15 V
Current-Tolerance Test Voltage
8.5 V
Current Tolerance Minimum
1.35 A
From tube to tube
Current Tolerance Maximum
1.5 A
From tube to tube