1AK4

Directly heated sharp-cutoff RF pentode for low-drain Class-A high-frequency amplification in portable equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Description

Directly heated sharp-cutoff RF pentode for low-voltage Class-A radio-frequency amplification.

General specifications

Properties common to every published source and operating point.

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

1 physical section, each with unique specifications.

Section 1

X-ray radiationInterelectrode capacitances

Promoted from the printed condensed-manual maximum/characteristic columns; operating-point values are retained in TUBE_SECTION_PARAMETER.

Source-dependent data

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

Published operating points and test conditions from this source.

SECTION 1

Filament Yoltage (dc)
1.25 volts
Filament Yoltage (dc) 1.25 1.25 volts
Filament Current
20 ma
Filament Current 20 20 ma.
Plate Voltage
6715 volts
Plate Voltage 45 6715 volts
Grid #
45 volts
Grid #2 Yoltage 45 volts
Grid #
67.5 volts
Grid #2 Supply Voltage 67.5 volts
Grid #
0.1 meg
Grid #2 Resistor 0.1 meg.
Grid #] VoltageA
0 volts
Grid #] VoltageA 0 0 volts
Plate Resistance
2 meg
Plate Resistance 15 2.0 meg.
Transconductance
750 pmhos
Transconductance 750 750 pmhos
Plate Current
0.75 ma
Plate Current 0.75 0.75 ma.
Grid #
0.2 ma
Grid #2 Current 0.2 0.2 ma.
Grid #] Yoltage {approx.) for Gm=
35 umhos
Grid #] Yoltage {approx.) for Gm=10 umhos -3 =35 volts
Plate or Grid #
2 Ma
Plate or Grid #2 Current - Ma.

Data set 02

Published operating points and test conditions from this source.

SECTION 1