25EC6

Beam-power pentode designed for horizontal-deflection amplifier service in television receivers using 110-degree picture tubes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: B8-110
Socket code: B9A
Base pins: 8
Nominal heater: 25 V / 600 mA

Description

The 25EC6 is a beam power pentode intended for horizontal-deflection amplifier service in television receivers using 110-degree picture tubes, with controlled heater warm-up and characteristics related to the 25CD6GB.

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: B8-110
Socket code: B9A
Base pins: 8
Nominal heater voltage: 25 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B8-110 - 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 0

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 4700 Ω
Transconductance: 0.0075 S
Amplification factor: 3.8
Max plate voltage: 700 V
Max screen voltage: 175 V
Max plate dissipation: 10 W
Max screen dissipation: 4 W
Max cathode current: 200 mA

Horizontal-deflection service; peak positive pulse plate rating promoted.

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 0

Beam Power

Other

Heater voltage
25 V
Nominal
Heater current
600 mA
Nominal
Maximum peak positive pulse plate voltage
7000 V
HorizontalDeflection
Maximum peak negative pulse plate voltage
1500 V
HorizontalDeflection
Plate voltage
135 V
Typical operating conditions
Screen voltage
135 V
Typical operating conditions
Grid 1 voltage
-22.5 V
Typical operating conditions

Characteristic

Heater warm-up time
11 s
ControlledWarmup
Plate resistance
4700 ohm
Typical operating conditions
Transconductance
7500 uS
Typical operating conditions
Plate current
70 mA
Typical operating conditions
Screen current
4.5 mA
Typical operating conditions
Triode amplification factor
3.8
Typical operating conditions

Capacitance

Grid 1 to plate
0.6 pF
Direct interelectrode capacitance
Input capacitance
24 pF
Direct interelectrode capacitance
Output capacitance
10 pF
Direct interelectrode capacitance

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

Heater voltage
25 V
TypicalOperation
Heater current
600 mA
TypicalOperation
Heater warm-up time
11 s
WholeTube
Plate voltage
135 V
TypicalOperation
Screen voltage
135 V
TypicalOperation
Plate resistance
4700 ohm
TypicalOperation
Transconductance
6500 µS
TypicalOperation
Plate current
70 mA
TypicalOperation
Triode-connected amplification factor
3.8
TriodeConnection

Characteristic

Grid 1-to-plate capacitance
0.6 pF
WholeTube
Input capacitance
24 pF
WholeTube
Output capacitance
10 pF
WholeTube

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 0

Beam Power

Other

DC Plate-Supply Voltage
700 V
HorizontalDeflection
Peak Negative Pulse Plate Voltage
1500 V
HorizontalDeflection

Characteristic

Plate Current
70 mA
AverageCharacteristics
Screen Current
4.5 mA
AverageCharacteristics