DA250

Directly heated oxide-cathode power triode designed principally for high-power push-pull audio amplification. Rated for approximately 250 W plate dissipation and 2.5 kV plate voltage for substantial professional audio and modulator stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10 V / 20 A

Description

Directly heated oxide-cathode power triode designed principally for push-pull audio amplifiers.

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: 20 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: 2300 Ω
Transconductance: 0.07 S
Amplification factor: 16
Max plate voltage: 2500 V
Max plate dissipation: 250 W

Applicable promoted ratings mapped semantically from the printed approximate-data/ratings tables; useful non-promoted operating, capacitance and service data retained in TUBE_SECTION_PARAMETER.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Resistance
2300 ohm
Anode-Grid Capacitance
41 pF
Anode-Cathode Capacitance
6 pF
Grid-Cathode Capacitance
21 pF
Typical Zero-Signal Plate Voltage
2700 V
ClassAB1;PushPull
Typical Maximum-Signal Plate Voltage
2500 V
ClassAB1;PushPull
Typical Maximum-Signal Plate Current
360 mA
ClassAB1;PushPull