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VCL11

Economy-receiver triode plus power-output tetrode developed for the DKE; the tetrode provides about 1.2 watts output with 4-watt plate dissipation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 90 V / 50 mA

Description

The VCL11 combines a voltage-amplifier triode with a power tetrode output section. Its low heater current and published low-power operating points were tailored to the DKE economy receiver.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 90 V
Nominal heater current: 50 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0024 S
Max plate voltage: 250 V
Max plate dissipation: 0.8 W

Triode measured at 100 V; operating load data also published.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 70000 Ω
Transconductance: 0.005 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 4 W
Max screen dissipation: 0.5 W
Max cathode current: 25 mA

Output tetrode section; representative 200 V values used for promoted characteristics.

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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
100 V
Section1

Characteristics

Triode transconductance at 100 V
2.4 mA/V
Section1

Capacitance

Input capacitance
4.2 pF
Section1
Grid-plate capacitance
<3.5 pF
Section1

SECTION 2

Tetrode

Other

Plate voltage
200 V
Section2
Screen voltage
200 V
Section2
Grid bias
-4.5 V
Section2
Plate current
12 mA
Section2
Screen current
1.2 mA
Section2
Output power
1.2 W
Section2;Distortion=10%
Load resistance
17000 Ohm
Section2