6DY4

High-efficiency high-transconductance strap-frame-grid triode designed for stable low-heater-power UHF oscillator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7DK
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 125 mA

Description

High-efficiency high-gm medium-mu strap-frame-grid triode intended for UHF oscillator service, with low heater power for low temperature, long life, and high stability.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7DK
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 125 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7DK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1P	A	P — Plate (Anode) Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN2G1	A	G1 — Control Grid Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN3H	—	H — Heater Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN4H	—	H — Heater Source-transcribed; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN5K	A	K — Cathode Chart transcription; independent verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN6G1	A	G1 — Control Grid Chart transcription; independent verification pending	Unverified EIA Base Connections, printed page 129, 7DK
PIN7P	A	P — Plate (Anode) Chart transcription; independent verification pending	Unverified EIA Base Connections, printed page 129, 7DK

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.011 S
Amplification factor: 28
Max plate voltage: 135 V
Max plate dissipation: 1.5 W
Max cathode current: 20 mA

Published ratings and characteristics promoted from the approved source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Grid Current
2 mA
Oscillator Plate Supply Voltage
135 V
960 MHz
Oscillator Plate Current
11.5 mA
960 MHz

Characteristic

Plate Current
10.4 mA
Class A1 at 90 V

Capacitance

Grid-to-Plate Capacitance
2 pF
Shielded