TH41

Mazda triode-hexode frequency changer for superheterodyne receivers. The triode supplies local oscillation while the hexode performs mixer action with useful conversion gain.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 4 V / 1.3 A

Description

Triode-heptode frequency changer for mains receivers.

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: 4 V
Nominal heater current: 1.3 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

2 physical sections, each with unique specifications.

Section 1

Hexode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0034 S
Max plate voltage: 250 V
Max screen voltage: 250 V

Heptode mixer section.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0053 S
Amplification factor: 16
Max plate voltage: 150 V
Max cathode current: 15 mA

Oscillator triode section.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Hexode

Other

Conversion conductance
750 uA/V
Typical screen voltage
100 V

SECTION 2

Triode

Other

Typical anode voltage
80 V
Typical anode current
4.5 mA