6814A

Medium-mu twin-triode variant with a 6.3-volt heater, providing paired triode sections for general voltage-amplifier and related electronic service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9A
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 350 mA

Description

6814A is listed in the supplied receiving-tube handbook as a medium-mu twin triode variant. The published heater/filament rating is 6.3 V at 0.35 A. Maximum ratings, representative operating characteristics, and available special-service data were captured from the supplied table.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9A
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 350 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN22G1	B	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN32K	B	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN4H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN5H	—	H — Heater EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN61P	A	P — Plate (Anode) EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN71G1	A	G1 — Control Grid EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN81K	A	K — Cathode EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A
PIN9HCT	—	HCT — Heater Center Tap EIA transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 130, 9A

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6250 Ω
Transconductance: 0.0031 S
Amplification factor: 19.5
Max plate voltage: 300 V

Published maximum ratings, representative operating conditions, and available capacitance/rectifier data reviewed.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6250 Ω
Transconductance: 0.0031 S
Amplification factor: 19.5
Max plate voltage: 300 V

Second physical triode restored under current one-row-per-physical-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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
300 V
Published handbook rating
Plate voltage
100 V
ClassA
Control-grid bias
0 V
ClassA
Plate current
11.8 mA
ClassA

Characteristic

Plate resistance
6250 ohm
Published handbook characteristic
Transconductance
3100 µS
Published handbook characteristic
Amplification factor
19.5
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
350 mA
Published heater/filament rating

Capacitance

Input capacitance
1.6 pF
Published capacitance column
Output capacitance
0.5 pF
Published capacitance column
Grid-to-plate capacitance
1.5 pF
Published capacitance column