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25DT5

Miniature beam-power pentode specifically designed for television vertical-deflection output service, with controlled heater warm-up and pulse-voltage ratings for scanning operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9HN
Socket code: -
Base pins: 9
Nominal heater: 25 V / 300 mA

Description

The 25DT5 is a 9-pin miniature beam power pentode designed for vertical-deflection output service in television receivers, with controlled heater warm-up and pulse-voltage ratings for scanning operation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9HN
Socket code: -
Base pins: 9
Nominal heater voltage: 25 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9HN - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	—	G2 — Screen Grid Literal label G2; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN3Base Pin	—	G1 — Control Grid Literal label G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN4Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN5Base Pin	—	H — Heater Literal label H; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN6Base Pin	—	G1 — Control Grid Literal label G1; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN7Base Pin	—	G3 — Suppressor GridGroup 9HN7 Literal label G3; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN7Base Pin	—	K — CathodeGroup 9HN7 Literal label K; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN8Base Pin	—	IC Literal label IC; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN
PIN9Base Pin	—	P — Plate (Anode) Literal label P; manufacturer confirmation pending	Unverified EIA Base Connections printed p132, 9HN

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Transconductance: 0.0062 S
Max plate voltage: 315 V
Max screen voltage: 285 V
Max plate dissipation: 9 W
Max screen dissipation: 2 W
Max cathode current: 55 mA

Published ratings and characteristics promoted from the approved source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Peak Positive Pulse Plate Voltage
2200 V
Absolute maximum
Peak Cathode Current
190 mA

Characteristic

Plate Current
44 mA
250 V plate and screen

Capacitance

Grid-to-Plate Capacitance
0.57 pF

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
25 V
Nominal
Heater current
300 mA
Nominal
Maximum peak positive pulse plate voltage
2200 V
HorizontalDeflection
Maximum peak cathode current
190 mA
HorizontalDeflection
Maximum peak negative pulse grid 1 voltage
-250 V
VerticalDeflection
Plate voltage
60 V
Typical operating conditions; OperatingPoint1
Plate voltage
80 V
Typical operating conditions; OperatingPoint2
Plate voltage
250 V
Typical operating conditions; OperatingPoint3
Screen voltage
150 V
Typical operating conditions; OperatingPoint1
Screen voltage
250 V
Typical operating conditions; OperatingPoint2
Screen voltage
250 V
Typical operating conditions; OperatingPoint3
Grid 1 voltage
0 V
Typical operating conditions; OperatingPoint1
Grid 1 voltage
0 V
Typical operating conditions; OperatingPoint2
Grid 1 voltage
-16.5 V
Typical operating conditions; OperatingPoint3

Characteristic

Heater warm-up time
11 s
ControlledWarmup
Transconductance
6200 uS
OperatingPoint3

Capacitance

Grid 1 to plate
0.57 pF
Direct interelectrode capacitance
Input capacitance
12.5 pF
Direct interelectrode capacitance
Output capacitance
4.9 pF
Direct interelectrode capacitance

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
25 V
TypicalOperation
Heater current
300 mA
TypicalOperation
Maximum positive pulse plate voltage
2200 V
VerticalDeflection
Maximum average cathode current
55 mA
WholeTube
Maximum peak cathode current
190 mA
WholeTube
Heater warm-up time
17 s
WholeTube
Plate voltage
250 V
TypicalOperation
Screen voltage
250 V
TypicalOperation
Transconductance
6000 µS
TypicalOperation