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KT150

High-power beam tetrode designed for high-fidelity audio output stages, with 70-watt maximum plate dissipation and substantial single-tube power capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 2 A

Description

High-power beam tetrode for low-frequency power amplification in HI-FI audio output stages.

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: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 2 A
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

Transconductance: 0.0126 S
Max plate voltage: 850 V
Max screen voltage: 650 V
Max plate dissipation: 70 W
Max screen dissipation: 9 W
Max cathode current: 275 mA

Transconductance is published as a minimum at the delivery-test operating point.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current minimum
1.75 A
Heater current maximum
2 A
Output power minimum
20 W
Ua=400V;Uc2=225V;Uc1=-14V

Capacitance

Input capacitance nominal
20.5 pF
Output capacitance nominal
10 pF
Transfer capacitance nominal
1.75 pF

Characteristic

Plate current minimum
150 mA
Ua=400V;Uc2=225V;Uc1=-14V
Plate current maximum
180 mA
Ua=400V;Uc2=225V;Uc1=-14V
Grid-2 current maximum
15 mA
Ua=400V;Uc2=225V;Uc1=-14V
Cathode-to-heater leakage current maximum
50 uA
Uk-h=+-300V

Data set 02

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Application

Application
HighPowerAudioOutput text