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7722

Wideband pentode amplifier with very high transconductance, co-designated E280F. Its manufacturer-defined role is broadband signal amplification where high gain and wide frequency response are required.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9EQ
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 320 mA

Description

Wideband pentode amplifier with very high transconductance. Co-designated E280F.

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: 9EQ
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 320 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9EQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	—	K — Cathode Original chart label: K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN2Base Pin	—	G1 — Control Grid Original chart label: G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN3Base Pin	—	K — Cathode Original chart label: K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN6Base Pin	—	IC Original chart label: IC; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN7Base Pin	—	P — Plate (Anode) Original chart label: P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN8Base Pin	—	G3 — Suppressor GridGroup 9EQ8 Original chart label: G3; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN8Base Pin	—	IS — Internal ScreenGroup 9EQ8 Original chart label: IS; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ
PIN9Base Pin	—	G2 — Screen Grid Original chart label: G2; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9EQ

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 100000 Ω
Transconductance: 0.026 S
Max plate voltage: 220 V
Max screen voltage: 180 V
Max plate dissipation: 4 W
Max screen dissipation: 1.1 W
Max cathode current: 30 mA
Rectifier warm-up time: 120 s

Pentode-mode values promoted; triode-connected characteristics retained as parameters.

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

1960 CBS Hytron

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Input capacitance
9.3 pF
Output capacitance
2.1 pF
Grid-to-plate capacitance
0.035 pF

Other

Plate supply voltage
190 V
PentodeConnection

Characteristics

Plate current
20 mA
PentodeConnection
Screen-grid current
6 mA
PentodeConnection
Transconductance
26000 uS
PentodeConnection
Plate resistance
100 kOhm
PentodeConnection
Plate current
24.5 mA
TriodeConnection
Transconductance
33000 uS
TriodeConnection
Plate resistance
1800 Ohm
TriodeConnection
Amplification factor
60 ratio
TriodeConnection