6847

Sharp-cutoff RF pentode using a 6.3 V, 0.3 A heater. Manufacturer handbook data provide ratings and representative operating characteristics for fixed-gain high-frequency signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9X
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

6847 is listed in the supplied receiving-tube handbook as a sharp-cutoff RF pentode. The published heater/filament rating is 6.3 V at 0.3 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: 9X
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9X - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN3H	—	H — Heater Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN4G3	A	G3 — Suppressor GridGroup 9X4 Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN4IS	A	IS — Internal ScreenGroup 9X4 Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN4K	A	K — CathodeGroup 9X4 Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN6P	A	P — Plate (Anode) Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN8G2	A	G2 — Screen Grid Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X
PIN9H	—	H — Heater Transcribed from EIA chart; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9X

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 12500 Ω
Max plate voltage: 180 V
Max screen voltage: 150 V

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

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

Pentode

Other

Maximum plate voltage
180 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
150 V
ClassA
Screen voltage
150 V
ClassA
Plate current
13 mA
ClassA
Screen current
4.5 mA
ClassA

Characteristic

Plate resistance
12500 ohm
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
300 mA
Published heater/filament rating

Capacitance

Input capacitance
7.1 pF
Published capacitance column
Output capacitance
2.9 pF
Published capacitance column
Grid-to-plate capacitance
0.04 pF
Published capacitance column