2S49D

Russian 2S49D (2С49Д) ruggedized indirectly heated subminiature metal-glass UHF triode for decimeter-band oscillation and amplification, with 2.4 V 0.48 A heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.4 V / 480 mA

Description

2S49D triode from a Russian vacuum-tube reference; technical description translated to English.

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: 2.4 V
Nominal heater current: 480 mA
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

Transconductance: 0.006 S
Amplification factor: 65
Max plate voltage: 700 V
Max plate dissipation: 4 W
Max grid dissipation: 0.8 W

Katsnelson/Larionov 1981 2С49Д rugged UHF triode. Maximum CONTINUOUS plate voltage 300 V; maximum PULSED plate voltage 700 V (scalar max_plate_voltage=700 is PULSED ONLY). Max plate dissipation 4 W, grid dissipation 0.8 W; max average cathode current 50 mA, peak pulse cathode current 800 mA (not assigned to generic cathode scalar). Nominal mu 65±10, gm >=0.006 A/V. Typical at plate 250 V grid -1 V, anode current 21±7 mA. Pulsed RF >=55 W at 200 MHz with anode 700 V, grid -40 V, 1 µs pulses at 250 Hz; continuous RF output >=2 W. Input C 2.85±0.45 pF, output <=0.1 pF, transfer 1.65±0.35 pF, cathode-heater 2.4–5 pF. Heater 2.4 V 0.48 A, cathode-heater max 100 V, max seal 170°C, life >=500 h. Ruggedized metal-glass disk contact construction.

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

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Transconductance
6 mA/V
Крутизна характеристики . . , . . ,. . . , 6 мА/В
Service life
>500 h
Наработка . . . . .. . в 2>500 ч
Heater voltage
2.15—92.7 V
Напряжение накала . . . .. .. , 2,15—92,7 В
Transconductance
>1.46 mA/V
крутизна характеристики >1,46 мА/В