2C50

Low-power double triode designed particularly for discriminator circuits in servo amplifiers, providing paired triode sections for control and instrumentation applications.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Low-power double triode designed particularly for discriminator circuits of servo amplifiers.

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: 0.00175 S
Amplification factor: 9.5
Max plate voltage: 800 V
Max plate dissipation: 3.85 W
Max cathode current: 30 mA

Representative row for two identical triode sections; tabulated operating values apply to each unit.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00175 S
Amplification factor: 9.5
Max plate voltage: 800 V
Max plate dissipation: 3.85 W
Max cathode current: 30 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
800 V
Maximum Plate Dissipation
3.85 W
Maximum Cathode Current
30 mA

Characteristic

Amplification Factor
10
Typical

Data set 02

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
300 V
Grid 1 Voltage
-24 V
Plate Current
12.5 mA

Characteristic

Transconductance
1750 uS
EachUnit
Amplification Factor
9.5
EachUnit