AF2

Indirectly heated high-frequency pentode designed for fixed-gain RF and IF amplification with high plate resistance.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: C35
Socket code: B5
Base pins: 5
Nominal heater: 4 V / 1.1 A

Description

Indirectly heated high-frequency pentode for RF and IF amplifier service.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: C35
Socket code: B5
Base pins: 5
Nominal heater voltage: 4 V
Nominal heater current: 1.1 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

C35 - 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: 1400000 Ω
Transconductance: 0.0032 S
Max plate voltage: 200 V
Max screen voltage: 100 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.3 W
Max cathode current: 10 mA

Published Telefunken ratings and characteristics promoted from the supplied source.

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 voltage
200 V
Screen voltage
100 V
Screen current
1.8 mA
Control-grid bias
-2 V

Characteristics

Transconductance
3200 µS
Remote-cutoff grid bias
-22 V

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
4 V
HeaterOrFilamentCurrent
1 A
Application
RF and IF amplifier

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
4 V
Heater current
1 A
Plate voltage
200 V
Screen/auxiliary voltage
100 V
Plate current
4.25 mA
Screen/auxiliary current
1.8 mA
Transconductance
2500 uS
Plate resistance
1400000 ohm

Capacitance

Input capacitance
6.4 pF
Output capacitance
7.5 pF
Plate-grid capacitance maximum
0.003 pF