7370

General-purpose medium-mu high-current double triode, electrically equivalent to the 5687 family, with independent sections and a series/parallel heater arrangement.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 40 V / 130 mA

Description

The 7370 is a general-purpose medium-mu double triode with electrically independent sections and a series/parallel heater arrangement, otherwise electrically equivalent to the 5687.

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: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 40 V
Nominal heater current: 130 mA
Parallel heater voltage: 20 V
Parallel heater current: 260 mA
Series capable: Yes

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3000 Ω
Transconductance: 0.0115 S
Max plate voltage: 330 V
Max plate dissipation: 4.75 W
Max cathode current: 65 mA

Representative row for electrically identical repeated sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 3000 Ω
Transconductance: 0.0115 S
Max plate voltage: 330 V
Max plate dissipation: 4.75 W
Max cathode current: 65 mA

Second physical triode restored.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

InversePlateVoltageMaximum
1000 V
EachUnit
TotalPlateDissipationMaximum
8.5 W
BothUnits
Plate Voltage
120 V
EachUnit

Characteristic

Plate Current
36 mA
EachUnit

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Grid To Plate: ( G To P' )
4 pf
PublishedTable
Grid To Cathode:(G To K+H)
4 pf
PublishedTable
Heater To Cathode:(H To K)
5 Pf
PublishedTable
Plate To Plate: (1P To 2P) (Approx.)
0.75 pf
PublishedTable
Grid To Grid: (1G To 2G) (Approx.)
0.025 pf
PublishedTable
Heater Voltage A
5 VOLTS
PublishedTable
Plate Voltage
250 VOLTS
PublishedTable
Plate Current
12 MA
PublishedTable
Plate Resistance
3000 OHMS
PublishedTable

Other

Maximum Plate Voltage
330 VOLTS
PublishedTable
Maximum Inverse Plate Voltage
1000 VOLTS
PublishedTable
Maximum Plate Dissipation (Each Unit)
4.75 WATTS
PublishedTable
Maximum Dc Grid Current (Each Unit)
6 MA
PublishedTable
Maximum Dc Cathode Current (Each Section)
65 MA
PublishedTable