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25L6G

Beam-power output tube for low-voltage AC/DC audio amplifier service, intended to provide Class-A power output in transformerless receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: -
Nominal heater: 25 V / 300 mA

Description

Beam power output tube for AC/DC audio amplifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: -
Nominal heater voltage: 25 V
Nominal heater current: 300 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

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 10000 Ω
Transconductance: 0.0082 S
Amplification factor: 82
Max plate voltage: 110 V
Max screen voltage: 110 V

Electrical section reconstructed from published ratings/characteristics; promoted transconductance normalized to A/V.

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

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum Plate Voltage
110 V
Published ratings
Maximum Screen Voltage
110 V
Published ratings
Plate Voltage
110 V
ClassA; Column1
Plate Voltage
110 V
ClassA; Column2
Screen Voltage
110 V
ClassA; Column1
Screen Voltage
110 V
ClassA; Column2
Grid Bias
-7.5 V
ClassA; Column1
Grid Bias
-7.5 V
ClassA; Column2
Signal Peak Voltage
7.5 V
ClassA; Column1
Signal Peak Voltage
7.6 V
ClassA; Column2
Amplification Factor
82
ClassA; Column1
Amplification Factor
82
ClassA; Column2
Plate Resistance {approx
10000 ohm
ClassA; Column1
Plate Resistance {approx
10000 ohm
ClassA; Column2
Transconductance
8200 uS
ClassA; Column1
Transconductance
8200 uS
ClassA; Column2
No-Signal Plate Current
49 mA
ClassA; Column1
No-Signal Plate Current
49 mA
ClassA; Column2
Maximum-Signal Plate Current
54 mA
ClassA; Column1
Maximum-Signal Plate Current
50 mA
ClassA; Column2
No-Signal Screen Current
4 mA
ClassA; Column1
No-Signal Screen Current
4 mA
ClassA; Column2
Maximum-Signal Screen Current
9 mA
ClassA; Column1
Maximum-Signal Screen Current
11 mA
ClassA; Column2
Load Resistance
1500 ohm
ClassA; Column1
Load Resistance
2000 ohm
ClassA; Column2
Total Harmonic Distortion
11 %
ClassA; Column1
Total Harmonic Distortion
10 %
ClassA; Column2
Second Harmonic Distortion
10 %
ClassA; Column1
Second Harmonic Distortion
3.5 %
ClassA; Column2
Third Harmonic Distortion
4 %
ClassA; Column1
Third Harmonic Distortion
8.5 %
ClassA; Column2
Power Output
2.1 W
ClassA; Column1
Power Output
2.2 W
ClassA; Column2
The voltage between heater and cathode should not exceed
90 V
ClassA

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Application

Service
Audio power output