KL4

Low-filament-current directly heated power pentode for Class A audio output in battery receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: P35(30)
Socket code: -
Base pins: -
Nominal heater: 2 V / 140 mA

Description

Directly heated low-filament-current power pentode for Class-A audio output service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: P35(30)
Socket code: -
Base pins: -
Nominal heater voltage: 2 V
Nominal heater current: 140 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

P35(30) - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 150000 Ω
Transconductance: 0.0021 S
Max plate voltage: 135 V
Max screen voltage: 135 V
Max plate dissipation: 1 W
Max screen dissipation: 0.3 W
Max cathode current: 10 mA

Promoted only where a fixed schema field matched the source semantics; all other published operating, capacitance, CRT, converter, and output data are preserved in TUBE_SECTION_PARAMETER.

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

Pentode

Other

Anode voltage
135 V
ClassA;OperatingPoint1
Anode current
6.5 mA
ClassA;OperatingPoint1
Control-grid voltage
-5 V
ClassA;OperatingPoint1
Screen-grid voltage
135 V
ClassA;OperatingPoint1
Screen-grid current
1 mA
ClassA;OperatingPoint1
Optimum matching impedance
19000 Ω
ClassA;OperatingPoint1
Power output at 10% distortion
0.44 W
ClassA;OperatingPoint1
Grid AC voltage at indicated output
3.3 V RMS
ClassA;OperatingPoint1
Anode voltage
90 V
ClassA;OperatingPoint2
Anode current
4.7 mA
ClassA;OperatingPoint2
Control-grid voltage
-2.5 V
ClassA;OperatingPoint2
Screen-grid voltage
90 V
ClassA;OperatingPoint2
Screen-grid current
0.7 mA
ClassA;OperatingPoint2
Optimum matching impedance
19000 Ω
ClassA;OperatingPoint2
Power output at 10% distortion
0.16 W
ClassA;OperatingPoint2
Grid AC voltage at indicated output
2 V RMS
ClassA;OperatingPoint2
Maximum anode dissipation
1 W
Pentode

Characteristic

Mutual conductance
2100 µS
ClassA;OperatingPoint1
Internal resistance
150000 Ω
ClassA;OperatingPoint1
Mutual conductance
1800 µS
ClassA;OperatingPoint2
Internal resistance
170000 Ω
ClassA;OperatingPoint2

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Cheuffage: direct par batterie; VE
2 V
alimentation en paralléle I[£
150 mA
Capacities Cagl <
1 pF

Other

Va = S0
135 V
ClassA
Vgl = -2)6
-5 V
ClassA
Ia = 447
7 mA
ClassA
Ig2 = 0,8
1.1 mA
ClassA
s = 1,8
2.1 mA/V
ClassA
Wo (d=10%) = 0,16
0.44 W
ClassA
Va = 90
135 V
ClassB
Vg2 = 90
135 V
ClassB
Vel = -5
-8 V
ClassB
Ia =2x1,0 2x2,7 [1]
2 %
ClassB
Ia =2x1,0 2x2,7 [2]
2 %
ClassB
Ia =2x1,0 2x2,7 [3]
4.9 mA
ClassB
Tg2 =2x0,2 2x0,5 2x0,3
2x0.8 mA
ClassB
Vo = [¢] 0,37 0
0.8 W
ClassB
Vg2 = max [1]
135 V
Vg2 = max [2]
135 V
Wg2 (Vi [1]
0 V
Wg2 (Vi [2]
0.15 W
Wg2 (Vi [3]
1 W
Wg2 (Wo = max.) = max. 0,30 ¥ 1k = mex
10 mA
Vgl (Igl=+0,3u4)= max
0.2 V