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Voltage - Dual Triode (similar) ·Triode-Triode

2C52

High-mu twin triode intended for Class-A voltage amplification, with approximately 100 amplification factor and low plate current for high-gain small-signal circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8BD
Socket code: IO
Base pins: 8
Nominal heater: 12.6 V / 300 mA

Description

High-mu twin triode for Class-A voltage-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: 8BD
Socket code: IO
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8BD - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN22P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN32K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN41G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN51P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN61K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN7H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD
PIN8H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8BD

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0019 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 10 mA

Promoted from the printed maximum-rating/characteristic columns; additional operating-point and capacitance data are retained in TUBE_SECTION_PARAMETER.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0019 S
Amplification factor: 100
Max plate voltage: 300 V
Max plate dissipation: 1 W
Max cathode current: 10 mA

Second physical triode restored under current section policy.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
12.6 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1 W
Maximum Cathode Current
10 mA

Characteristic

Transconductance
1900 µS
Typical
Amplification Factor
100
Typical

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Input capacitance
2.3 pF
Section1
Output capacitance
0.75 pF
Section1
Grid-to-plate capacitance
2.7 pF
Section1

Other

Plate voltage
250 V
ClassA
Control-grid voltage
-2 V
ClassA
Plate current
1.3 mA
ClassA

Characteristic

Transconductance
1900 µS
ClassA
Amplification factor
100
ClassA

Data set 03

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
250 V
Grid 1 Voltage
-2 V
Plate Current
1.3 mA

Characteristic

Transconductance
1900 uS
EachUnit
Amplification Factor
90
EachUnit