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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

UL41

Series-heater power pentode providing approximately 4 W Class A audio output in transformerless radios.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B8A
Base pins: 8
Nominal heater: 45 V / 100 mA

Description

Power pentode for Class A low-frequency audio output amplification.

Socket description

Rimlock 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8A
Base pins: 8
Nominal heater voltage: 45 V
Nominal heater current: 100 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 20000 Ω
Transconductance: 0.0095 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 9 W
Max screen dissipation: 1.75 W
Max cathode current: 75 mA

Power pentode; promoted characteristics use the 165 V nominal operating column.

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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Anode Voltage
100 V
ClassA; OneTube
Screen Voltage
100 V
ClassA; OneTube
Control Grid Voltage
-5.7 V
ClassA; OneTube
Anode Current
29 mA
ClassA; OneTube
Screen Current
5.5 mA
ClassA; OneTube
Optimum Load
3000 ohm
ClassA; OneTube
Power Output
1.35 W
ClassA; OneTube
Anode Voltage
200 V
PushPull; TwoTubes
Power Output
12.5 W
PushPull; TwoTubes
Anode-to-Anode Load
4000 ohm
PushPull; TwoTubes

Characteristics

Input Capacitance
11 pF
Output Capacitance
8.3 pF
Control Grid to Anode Capacitance
1 pF
Maximum

Data set 02

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
165 V
Nominal
Screen Voltage
165 V
Nominal
BiasResistor
140 Ohm
AutomaticBias
Plate Current
54.5 mA
Nominal
Screen Current
9 mA
Nominal
OutputPower
3.8 W
Nominal
Total Distortion
10 percent
Nominal
Load Impedance
3000 Ohm
Nominal

Capacitance

Input Capacitance
12.3 pF
Output Capacitance
9.3 pF
Plate To Grid Capacitance
1 pF
Maximum

Data set 03

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
170 V
ClassA
Plate Current
53 mA
ClassA
Screen Current
10 mA
ClassA
Power Output
4 W
ClassA,10PercentDistortion

Characteristic

Transconductance
9500 µS
ClassA
Plate Resistance
20000 ohm
ClassA

Data set 04

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Anode capacitance
8.3 pF
Control-grid capacitance
11 pF

Other

Plate voltage
100 V
ClassA
Screen voltage
100 V
ClassA
Plate current
29 mA
ClassA; PlateVoltage=100V
Screen current
5.5 mA
ClassA; PlateVoltage=100V
Plate voltage
170 V
ClassA
Screen voltage
170 V
ClassA
Plate current
53 mA
ClassA; PlateVoltage=170V
Screen current
10 mA
ClassA; PlateVoltage=170V
Plate voltage
170 V
ClassAB; PushPull; TwoTubes
Power output
11.5 W
ClassAB; PushPull; TwoTubes

Characteristic

Transconductance
8000 uS
ClassA; PlateVoltage=100V
Plate resistance
18 kOhm
ClassA; PlateVoltage=100V
Transconductance
9500 uS
ClassA; PlateVoltage=170V
Plate resistance
20 kOhm
ClassA; PlateVoltage=170V

Data set 05

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

9W. and with
100 mA
Published in approved UL41.pdf target datasheet; Section1
I. 29 53
45 mA
Published in approved UL41.pdf target datasheet; Section1
Ig z 5.5 10
8.5 mA
Published in approved UL41.pdf target datasheet; Section1
gm 8.0 9.5 8
2 mA
Published in approved UL41.pdf target datasheet; Section1
(Pout =
50 mW
Published in approved UL41.pdf target datasheet; Section1
la (o l 2 x24 2 x44 2 x
45 mA
Published in approved UL41.pdf target datasheet; Section1
I, (m ax. sig.) 2 x27 2 x49 2 x
53 mA
Published in approved UL41.pdf target datasheet; Section1
Ig 2.10 1 2 x4 .6 2 x8 .8 2 x
9 mA
Published in approved UL41.pdf target datasheet; Section1
Ig z (max . sig .) 2 x 6.8 2 X 16 .5 2 x
19 mA
Published in approved UL41.pdf target datasheet; Section1
9W , and with
100 mA
Published in approved UL41.pdf target datasheet; Section1
9W, and with
100 mA
Published in approved UL41.pdf target datasheet; Section1
9W , and with
100 mA
Published in approved UL41.pdf target datasheet; Section1

Data set 06

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Power Output
4 W
ClassA;OneTube;Plate 170 V;Screen 170 V;Load 3 kohm

Data set 07

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Capacitznces Ca
8.3 a
Capacitznces Ca = 8,3 pF
Capacit@nces Ca
8.3 a
Capacit@nces Ca = 8,3 pi