TH30C

Mullard triode-hexode frequency changer combining a relatively high-transconductance oscillator triode with a high-resistance mixer section for superheterodyne receiver conversion service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 200 mA

Description

Triode-heptode frequency changer for receiver service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 200 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0055 S
Amplification factor: 17.5
Max plate voltage: 185 V
Max cathode current: 14 mA

Promoted from published Mullard absolute-maximum/limiting-value and characteristic tables; service-specific limits retained in parameter rows.

Section 2

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 1500000 Ω
Transconductance: 0.00075 S
Max plate voltage: 300 V
Max screen voltage: 150 V
Max cathode current: 25 mA

Promoted from published Mullard absolute-maximum/limiting-value and characteristic tables; service-specific limits retained in parameter rows.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

HeaterOrFilamentVoltage
4 V
HeaterOrFilamentCurrent
200 mA
Plate Voltage
100 V
Plate Current
9.5 mA
Transconductance
5500 uS
Amplification Factor
17.5

Other

MaxPlateVoltage
185 V
MaxPlateCurrent
14 mA

SECTION 2

Hexode

Characteristic

Plate Voltage
250 V
Screen Voltage
100 V
OscillatorInjectionVoltageRMS
8 V
Grid Voltage
-2.5 V
Plate Current
3.25 mA
Screen Current
6 mA
Conversion Transconductance
750 uS
Plate Resistance
1.5 Mohm

Other

MaxPlateVoltage
300 V
MaxScreenVoltage
150 V
MaxCathodeCurrent
25 mA