8522

Premium subminiature dual-control pentode for amplifier and mixer service in severe-environment equipment. An additional control electrode enables frequency conversion and signal-control functions beyond ordinary pentode amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 6.3 V / 150 mA

Description

Premium subminiature dual-control pentode useful as an amplifier or mixer in severe-environment electronic equipment.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0032 S
Max plate voltage: 165 V
Max screen voltage: 155 V
Max plate dissipation: 0.7 W
Max screen dissipation: 0.55 W
Max cathode current: 16 mA

Premium dual-control pentode; grid-3 control characteristics retained in 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Nominal
Heater current
150 mA
Nominal
Plate voltage
165 V
Published operating table; OperatingPoint1
Plate voltage
100 V
Published operating table; OperatingPoint1
Plate voltage
100 V
Published operating table; OperatingPoint2
Plate voltage
100 V
Published operating table; OperatingPoint1
Screen voltage
155 V
Published operating table; OperatingPoint1
Screen voltage
100 V
Published operating table; OperatingPoint1
Screen voltage
100 V
Published operating table; OperatingPoint2
Screen voltage
100 V
Published operating table; OperatingPoint1

Characteristic

Plate current
3.5 mA
Published operating table; OperatingPoint1
Transconductance
1400 uS
Published operating table; OperatingPoint1

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
165 V
Maximum screen voltage
155 V
Maximum negative grid #1 voltage
-55 V
Maximum positive grid #3 voltage
30 V
Maximum plate dissipation
0.7 W
Maximum screen dissipation
0.55 W
Maximum cathode current
16 mA
Maximum envelope temperature
220 degC
Maximum altitude
60000 ft
Plate voltage
100 V
DualControlAmplifier
Screen voltage
100 V
DualControlAmplifier
Cathode resistor
150 ohm
DualControlAmplifier
Plate current
5.3 mA
DualControlAmplifier
Screen current
3.6 mA
DualControlAmplifier
Low-frequency vibration output maximum
60 mV
15G;40Hz;RL=10kohm

Characteristic

Grid #1 transconductance
3200 uS
DualControlAmplifier
Plate resistance
110000 ohm
DualControlAmplifier
Grid #3 transconductance at -1 V
7050 uS
DualControlAmplifier

Capacitance

Grid #1-to-plate capacitance
0.02 pF
WithoutShield
Grid #3-to-plate capacitance
1.1 pF
WithoutShield
Grid #1-to-all capacitance
4 pF
WithoutShield
Grid #3-to-all capacitance
4 pF
WithoutShield
Plate-to-all capacitance
3.4 pF
WithoutShield
Grid #1-to-grid #3 capacitance
0.15 pF
WithoutShield