1T6

Ultra-low-power directly heated diode-pentode for detector and voltage-amplifier service in battery receivers. The diode supplies signal rectification while the pentode provides subsequent gain from very modest filament and plate supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8DA
Socket code: -
Base pins: -
Nominal heater: 1.25 V / 40 mA

Description

Directly heated diode-pentode for detector and low-voltage amplifier service. Published maximum ratings, characteristics, and representative operating conditions were extracted from the approved manual page.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8DA
Socket code: -
Base pins: -
Nominal heater voltage: 1.25 V
Nominal heater current: 40 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8DA - 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

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Detector diode section.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.0006 S
Max plate voltage: 67.5 V
Max screen voltage: 67.5 V

Directly heated diode-pentode for detector and low-voltage amplifier service.

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 2

Pentode

Other

Plate voltage
67.5 V
ClassA; OperatingPoint1
Screen voltage
67.5 V
ClassA; OperatingPoint1
Control-grid bias
0 V
ClassA; OperatingPoint1
Plate current
1.6 mA
ClassA; OperatingPoint1
Screen current
0.4 mA
ClassA; OperatingPoint1
Plate voltage
30 V
ClassA; OperatingPoint2
Screen voltage
30 V
ClassA; OperatingPoint2
Control-grid bias
0 V
ClassA; OperatingPoint2
Plate current
0.33 mA
ClassA; OperatingPoint2
Screen current
0.1 mA
ClassA; OperatingPoint2
Maximum plate voltage
67.5 V
Maximum screen voltage
67.5 V

Characteristics

Plate resistance
400000 ohm
ClassA; OperatingPoint1
Transconductance
600 uS
ClassA; OperatingPoint1
Plate resistance
500000 ohm
ClassA; OperatingPoint2
Transconductance
330 uS
ClassA; OperatingPoint2