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Power - Triode ·Triode

ES85

Power triode intended principally for audio-frequency output or modulator service. Manufacturer operating data emphasize Class A, AB, or B power amplification and useful audio output rather than continuous RF transmitting duty.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
10 V / 3.25 A

Description

Directly heated thoriated-tungsten radiation-cooled triode for Class B amplifier/modulator and Class C amplifier or oscillator service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
10 V
Nominal heater current
3.25 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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
3450 Ω
Transconductance
0.0037 S
Amplification factor
12.7
Max plate voltage
1250 V
Max plate dissipation
85 W

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 AEI Industrial Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • MaximumAudioOutputTwoValves

    310 W

    ClassB;PushPull;TwoTubes

Characteristics

  • DistortionAtMaximumOutput

    3 %

  • Anode Grid Capacitance

    13 pF

  • GridFilamentCapacitance

    65 pF

Data set 02

1961 Associated Electrical Industries

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • MaximumAudioOutputTwoValves

    310 W

    ClassB;PushPull;TwoTubes

Characteristics

  • DistortionAtMaximumOutput

    3 %

  • Anode Grid Capacitance

    13 pF

  • GridFilamentCapacitance

    65 pF