6670

High-frequency twin triode intended for RF amplification and related high-frequency circuitry, combining two triode sections in a miniature envelope.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8CJ
Socket code: -
Base pins: 8
Nominal heater: 6.3 V / 350 mA

Description

6670 is listed in the supplied receiving-tube handbook as a high-frequency twin triode. 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.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8CJ
Socket code: -
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 350 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8CJ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1H	—	H — Heater Original EIA label H; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN22K	B	K — Cathode Original EIA label 2K; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN32G1	B	G1 — Control Grid Original EIA label 2G1; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN42P	B	P — Plate (Anode) Original EIA label 2P; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN5IS	A	IS — Internal Screen Original EIA label IS; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN61P	A	P — Plate (Anode) Original EIA label 1P; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN71G1	A	G1 — Control Grid Original EIA label 1G1; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN81K	A	K — Cathode Original EIA label 1K; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ
PIN9H	—	H — Heater Original EIA label H; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CJ

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 6400 Ω
Transconductance: 0.0055 S
Amplification factor: 35
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: 6400 Ω
Transconductance: 0.0055 S
Amplification factor: 35
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
150 V
ClassA
Plate current
8.2 mA
ClassA

Characteristic

Plate resistance
6400 ohm
Published handbook characteristic
Transconductance
5500 µS
Published handbook characteristic
Amplification factor
35
Published handbook characteristic
Heater/filament voltage
6.3 V
Published heater/filament rating
Heater/filament current
350 mA
Published heater/filament rating