849A

Higher-current transmitting triode variant of the 849 for AM broadcasting and industrial RF heating. Published Class C operation produces about 1.2 kW RF output from a 3 kV plate supply.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 3
Nominal heater: 10.5 V / 11 A

Description

Higher-current transmitting-triode variant of the 849 for AM broadcasting and RF heating.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 3
Nominal heater voltage: 10.5 V
Nominal heater current: 11 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

Transconductance: 0.0076 S
Amplification factor: 19
Max plate voltage: 4000 V
Max plate dissipation: 500 W
Max cathode current: 500 mA

Promoted ratings and characteristics mapped from source tables.

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Grid To Plate Capacitance
16 pF
Published direct interelectrode capacitance
Grid To Filament Capacitance
14 pF
Published direct interelectrode capacitance

Data set 02

1958 Amperex Industrial

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
3000 V
RFPowerAmplifier;ClassC
Plate current
500 mA
RFPowerAmplifier;ClassC
Power output
1200 W
RFPowerAmplifier;ClassC
Control-grid voltage
-500 V
RFPowerAmplifier;ClassC
Grid current
100 mA
RFPowerAmplifier;ClassC
Maximum frequency at full input
20 MHz
RFPowerAmplifier

Capacitance

Grid-to-plate capacitance
11.5 pF
Section1
Grid-to-filament capacitance
4 pF
Section1
Plate-to-filament capacitance
1.8 pF
Section1

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
3000 V
RFPowerAmplifier
Plate current
500 mA
RFPowerAmplifier
Power output
1200 W
RFPowerAmplifier
Control-grid voltage
-500 V
RFPowerAmplifier
Grid current
100 mA
RFPowerAmplifier
Maximum frequency at full input
20 MHz
RFPowerAmplifier

Capacitance

Grid-to-plate capacitance
11.5 pF
Section1
Grid-to-filament capacitance
4 pF
Section1
Plate-to-filament capacitance
1.8 pF
Section1