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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

CL2

Telefunken 200 mA series-heater output pentode providing roughly 1–3 W in AC/DC radio receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
P8A
Base pins
8
Nominal heater
24 V / 200 mA

Description

The Telefunken CL2 is an indirectly heated 200 mA output pentode for AC/DC receivers, with published output of about 1 W at 100 V and 3 W at 200 V.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
P8A
Base pins
8
Nominal heater voltage
24 V
Nominal heater current
200 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
Plate resistance
19000 Ω
Transconductance
0.0037 S
Max plate voltage
200 V
Max screen voltage
100 V
Max plate dissipation
8 W
Max cathode current
70 mA

Audio output pentode; maximum ratings and a representative published operating point are promoted.

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

    ClassA

  • Plate current

    40 mA

    ClassA; PlateVoltage=200V

  • Grid bias

    -11 V

    ClassA; PlateVoltage=200V

  • Screen voltage

    75 V

    ClassA; PlateVoltage=200V

  • Optimum load resistance

    5000 ohm

    ClassA; PlateVoltage=200V

  • Power output

    2.5 W

    ClassA; PlateVoltage=200V

  • Grid AC voltage

    6.9 V RMS

    AtRatedOutput

  • Maximum anode dissipation

    8 W

  • Plate voltage

    100 V

    ClassA; AlternatePoint

  • Plate current

    50 mA

    ClassA; AlternatePoint

  • Grid bias

    -15 V

    ClassA; AlternatePoint

  • Screen voltage

    100 V

    ClassA; AlternatePoint

  • Optimum load resistance

    2000 ohm

    ClassA; AlternatePoint

  • Power output

    1.7 W

    ClassA; AlternatePoint

Characteristic

  • Transconductance

    3.7 mA/V

    ClassA; PlateVoltage=200V

  • Internal resistance

    19000 ohm

    ClassA; PlateVoltage=200V

  • Transconductance

    3.8 mA/V

    ClassA; AlternatePoint

  • Internal resistance

    16000 ohm

    ClassA; AlternatePoint

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater Current

    200 mA

    Series-heater AC/DC operation

Other

  • Power Output

    1 W

    PlateVoltage=100V

  • Power Output

    3 W

    PlateVoltage=200V

  • Maximum Heater-to-Cathode Peak Voltage

    175 V

Data set 03

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Typical plate voltage

    200 V

  • Typical screen voltage

    100 V

  • Typical plate current

    40 mA

  • Typical control-grid voltage

    -19 V

  • Output power

    3 W

    Single-ended published operating point

  • Load resistance

    5000 Ohm

    Single-ended published operating point

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heizspannung bei

    0 mA

    Published datasheet specification

  • Heizspannung ............ Vf 224V

    24 V

    Published datasheet specification

  • Heizstrom ................ If —

    200 A

    Published datasheet specification

  • Anodenspannung .......... Va

    200 V

    Published datasheet specification

  • Schirmgitterspannung ...... Vg2

    100 V

    Published datasheet specification

  • Neg. Gittervorspannung .... Vgl

    19 V

    Published datasheet specification

  • Anodenstrom ............ la — 40 mA - 40 mA

    50 mA

    Published datasheet specification

  • Schirmgitterstrom ........ Ig2 — 5 mA

    4.5 mA

    Published datasheet specification

  • Max. Steilheit ............ Smix

    8

    Published datasheet specification

  • Norm. Steilheit .......... Snorm

    3.1 mA/V

    Published datasheet specification

  • Norm. innerer Widerstand.. Rinorm —

    3 Ohm

    Published datasheet specification

  • Published specification

    19 Ohm

    Published datasheet specification

  • Maximale Anodenleistung .. Wamix

    8

    Published datasheet specification

  • Heizfaden ..................................... Rfk max —

    0 Ohm

    Published datasheet specification

  • Heizfaden

    175 V

    Published datasheet specification

  • Published specification

    1000 Ohm

    Published datasheet specification

  • V|Va

    200

    Published datasheet specification

  • V | Va

    2

    Published datasheet specification

  • Published specification

    10

    Published datasheet specification

  • Published specification

    20 V

    Published datasheet specification

  • Bei Va

    100 V

    Published datasheet specification

  • Bai Va

    200 V

    Published datasheet specification

  • stungen bei

    10

    Published datasheet specification

  • Vg2

    100 v

    Published datasheet specification

  • Published specification

    0

    Published datasheet specification

  • Published specification

    8

    Published datasheet specification

  • 23T 2 EE

    2

    Published datasheet specification

  • nung bei Vg2

    75 V

    Published datasheet specification