4695

Acorn pentode developed for high-frequency voltage amplification, combining compact low-capacitance construction with high plate resistance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: WITHOUTBASE-MV
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 150 mA

Description

Acorn pentode for high-frequency amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: WITHOUTBASE-MV
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

WITHOUTBASE-MV - 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

Plate resistance: 800000 Ω
Transconductance: 0.0018 S
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.5 W
Max cathode current: 10 mA

Promoted only from clearly identified published characteristics/limits; additional operating, capacitance, regulator, gas-tube, and push-pull data retained as section parameters.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate current
5.5 mA
UHFAmplifier;ControlGrid=-3V
Control-grid voltage
-3 V
UHFAmplifier
Screen voltage
100 V
UHFAmplifier
Suppressor-grid voltage
0 V
UHFAmplifier
Screen current
1.8 mA
UHFAmplifier
Control-grid voltage
-45 V
DeepCutoff

Characteristic

Plate resistance
800000 Ω
ControlGrid=-3V
Transconductance
1800 µS
ControlGrid=-3V
Amplification factor
1440
ControlGrid=-3V
Plate resistance minimum
10000000 Ω
DeepCutoff

Capacitance

Grid-to-plate capacitance
0.007 pF
LessThan
Plate-to-cathode capacitance
3.5 pF
Section1
Grid-to-cathode capacitance
2.7 pF
Section1

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage operating
250 V
Screen voltage operating
100 V
Control-grid voltage operating
0 V
Plate voltage maximum
250 V
Plate dissipation maximum
1.5 W
Screen voltage maximum
125 V
Screen dissipation maximum
0.5 W
Cathode current maximum
10 mA
Screen current maximum
2.3 mA
Grid circuit resistance maximum
3 Mohm
Heater-cathode voltage maximum
50 V
Heater-cathode resistance maximum
20000 ohm

Characteristics

Transconductance
1.7 mA/V
Plate resistance minimum
10 Mohm
Screen current minimum
1.2 mA

Application

Application
High-frequency acorn pentode amplifier