KDD1

European double triode documented in Philips valve tables; available source establishes operating characteristics but does not clearly identify a narrower specialized application.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / 220 mA

Description

KDD1 is listed in the supplied valve table as a double triode. 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: 2 V
Nominal heater current: 220 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: 10000 Ω
Amplification factor: 2
Max plate voltage: 150 V
Max plate dissipation: 1.6 W
Max cathode current: 20 mA

Published target-row operating and characteristic values reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 10000 Ω
Amplification factor: 2
Max plate voltage: 150 V
Max plate dissipation: 1.6 W
Max cathode current: 20 mA

Second physical triode section; added to align rows with SectionCount.

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
135 V
Published table operating point
Plate current
3 mA
Published table operating point
Control-grid bias
0 V
Published table operating point

Characteristic

Plate resistance
10000 ohm
Published table characteristic
Amplification factor
2
Published table characteristic
Heater/filament voltage
2 V
Published heater/filament rating
Heater/filament current
220 mA
Published heater/filament rating

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate current per section at maximum modulation
10 mA
ClassB;PushPull;TwoTubes;PlateVoltage=90V
Output power
0.72 W
ClassB;PushPull;TwoTubes;PlateVoltage=90V
Driver grid voltage
1.57 V RMS
ClassB;PushPull;TwoTubes;PlateVoltage=90V
Load resistance between plates
10000 ohm
ClassB;PushPull;TwoTubes;PlateVoltage=90V
Plate current per section at maximum modulation
14 mA
ClassB;PushPull;TwoTubes;PlateVoltage=135V
Output power
2 W
ClassB;PushPull;TwoTubes;PlateVoltage=135V
Driver grid voltage
1.9 V RMS
ClassB;PushPull;TwoTubes;PlateVoltage=135V
Load resistance between plates
10000 ohm
ClassB;PushPull;TwoTubes;PlateVoltage=135V
Maximum plate voltage per section
150 V
Maximum plate dissipation without signal
0.35 W
Maximum plate dissipation at full signal
1.6 W
Maximum average plate current per section
20 mA