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6528

Rugged long-life twin power triode developed as a high-current series-pass tube for regulated power supplies. Each section combines very high transconductance, low plate resistance, and approximately 30 W dissipation for demanding regulator and power-control service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 5 A

Description

Long-life rugged twin power triode developed as a high-current series-pass tube for regulated power supplies. Electrical ratings, characteristics, operating data, and special environmental information were extracted from the supplied source.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 5 A
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

2 physical sections, with 1 unique section. The remaining sections have identical specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 245 Ω
Transconductance: 0.035 S
Amplification factor: 8
Max plate voltage: 400 V
Max plate dissipation: 30 W
Max cathode current: 300 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed where applicable.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater or filament voltage
6.3 V
Published nominal or representative value
Heater or filament current
5 A
Published nominal or representative value
Transconductance
37000 µS
Published operating characteristic

Other

Maximum plate dissipation
30 W
Published maximum rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Nominal
Heater current
5 A
Nominal
Plate voltage
0 V
Published operating table; OperatingPoint1
Plate voltage
400 V
Published operating table; OperatingPoint2
Plate current per section maximum
300 mA
PerSection
Maximum altitude at full ratings
10000 ft

Characteristic

Transconductance
29 uS
Published operating table; OperatingPoint1
Transconductance
0 uS
Published operating table; OperatingPoint2
Transconductance
45 uS
Published operating table; OperatingPoint3
Transconductance
0 uS
Published operating table; OperatingPoint4
Plate resistance
245 ohm
Published operating table; OperatingPoint1

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

TRANSCONDUCTANCE (PER SECTION)
3 uS
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE RESISTANCE
245 ohm
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
HEATER VOLTAGE — published value 1
57 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
HEATER VOLTAGE — published value 2
9 V
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
SHOCK:
480
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE CURRENT — published value 1
5 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE CURRENT — published value 2
0 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE PER SECTION — published value 1
23
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE PER SECTION — published value 2
500
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
HK LEAKAGE (MAX.)
0 uA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE CURRENT PER SECTION — published value 1
0 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE CURRENT PER SECTION — published value 2
230 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
AMPLIFICATION FACTOR — published value 1
0
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
AMPLIFICATION FACTOR — published value 2
0
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE — published value 1
29 uS
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE — published value 2
0 uS
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE — published value 3
45 uS
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
TRANSCONDUCTANCE — published value 4
0 uS
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
HEATER CURRENT PER TUBE — published value 1
4.75 A
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
HEATER CURRENT PER TUBE — published value 2
5.25 A
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
PLATE CURRENT PER SECTION — published value 2
3 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
Plate resistance
245 ohm
Promoted section value from the supplied datasheet.
Transconductance
0.035 A/V
Promoted section value from the supplied datasheet.
Amplification factor
8
Promoted section value from the supplied datasheet.

Other

MAXIMUM SHOCK RATING (NAVY HI
7 mA
Published datasheet table value; multiple values on a source row represent separate limits or operating conditions.
Maximum plate voltage
400 V
Promoted section value from the supplied datasheet.
Maximum plate dissipation
60 W
Promoted section value from the supplied datasheet.
Maximum cathode current
300 mA
Promoted section value from the supplied datasheet.