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UL12

High-current series-heater output pentode providing approximately 5.5 W in AC/DC receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 60 V / 100 mA

Description

The UL12 is an indirectly heated output pentode for AC/DC series-heater receivers. It is rated for 15 W plate dissipation and provides about 5.5 W audio output at a representative 200 V operating point.

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: 60 V
Nominal heater current: 100 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: 12000 Ω
Transconductance: 0.012 S
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 15 W
Max screen dissipation: 1 W
Max cathode current: 100 mA

Published 200 V operating point gives 12 mA/V and 12 kOhm; screen dissipation under drive may reach 3 W.

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

Pentode

Other

Plate voltage
200 V
Screen voltage
125 V
Grid bias
-8 V
Plate current
75 mA
Screen current
9 mA
Load resistance
2000 Ohm
Output power
5.5 W
Distortion=9%
Maximum screen dissipation under drive
3 W