UF11

Variable-mu pentode for RF, IF, and audio amplification with flexible gain-control modes in series-heater equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 15 V / 100 mA

Description

The UF11 is an indirectly heated variable-mu pentode specified for RF, intermediate-frequency and audio-frequency amplification. The sheet includes fixed-screen and sliding-screen gain-control operating data.

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: 15 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: 1000000 Ω
Transconductance: 0.0022 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 2 W
Max screen dissipation: 0.3 W
Max cathode current: 10 mA

Published ratings and characteristics promoted semantically from the approved source; identical repeated sections compressed where applicable.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
170 V
Plate Current
6 mA
Screen Voltage
120 V
Screen Current
1.75 mA

Characteristic

Transconductance
2200 µS
Plate Resistance
1000000 ohm

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
200 V
ScreenVoltage=80V
Screen voltage
80 V
Grid bias
-2 V
Plate current
6 mA
Screen current
2 mA

Characteristics

Reduced transconductance
22 uS
RegulationRatio=100:1

Capacitance

Input capacitance
7.5 pF
Output capacitance
6.7 pF
Grid-plate capacitance
<0.003 pF

Data set 03

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Capacitances Ca
6.5 a
Capacitances Ca = 6,5 pF