5847A

Improved 5847-family broad-band pentode with additional low-voltage operating characteristics intended to reduce gain variation. It retains the miniature high-gain wideband amplifier function while supporting more controlled operation under reduced supply conditions.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Pentode variant of 5847 with added low-voltage operating characteristics for reduced gain variation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0085 S
Max plate voltage: 200 V
Max screen voltage: 165 V
Max plate dissipation: 3.3 W
Max screen dissipation: 0.85 W
Max cathode current: 40 mA

1964 Amperex JEDEC registration states 5847A identical to 5847 except additional low-voltage operating characteristics; 5847/404A original RCA reference establishes indirectly heated heater 6.3 V 0.3 A, nine-pin miniature, sharp-cutoff high-gain broadband pentode. Absolute maximum plate 200 V, screen 165 V, plate dissipation 3.3 W, screen dissipation 0.85 W and cathode current 40 mA. New 5847A operating table specifies plate 150 V and screen 150 V with cathode resistance 4 kΩ and transconductance 8500 µmhos (0.0085 S), already in section; alternative mode 3000 µmhos. Original 5847 at other conditions gives 12,500 µmhos, not to overwrite the 5847A low-voltage setting. Manufacturer publishes direct interelectrode capacitances; operating conditions intended to minimize gain change with supply voltage variations. Existing socket code retained pending canonical reconciliation.

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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
150 V
Screen-grid voltage
150 V
Cathode-bias resistance
4000 ohm
Control-grid voltage
2 V
Screen-grid current
1.2 mA
Alternate cathode-bias resistance
9000 ohm
Alternate control-grid voltage
2.45 V
Alternate screen-grid current
0.3 mA

Characteristics

Transconductance
8500 uS
Alternate transconductance
3000 uS

Application

Purpose
Operating points minimizing gain variation from supply fluctuations