Power - Pentode (NOT beam) ·Pentode
Early Philips directly heated three-grid battery output pentode for audio amplification from approximately 50–150 V supplies.
Philips D143 is a directly heated historical three-grid output valve, classified as a pentode. The Dutch sheet gives 1.0 V/0.65 A filament data, 50-150 V plate and screen supply range, μ 100, gm 1.8 mA/V, rp 55.5 kohm, and a 12 mA normal plate current.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Published Dutch data: amplification factor 100, transconductance 1.8 mA/V, internal resistance 55.5 kohm, anode/screen supply 50-150 V.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater voltage
1 V
Heater current
650 mA
Saturation current
50 mA
Amplification factor
100
Transconductance
1800 uS
Plate resistance
55500 ohm
Plate voltage range
50 to 150 V
Screen grid voltage range
50 to 150 V
Negative grid voltage
15 V
Normal plate current
12 mA