EFM11

Combination remote-cutoff audio pentode and visual tuning indicator, providing variable-gain amplification together with fluorescent receiver tuning or level indication.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

Remote-cutoff AF pentode combined with visual tuning indicator.

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: 6.3 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

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 700000 Ω
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 0.4 W
Max screen dissipation: 0.2 W

Published Telefunken values promoted where applicable; additional values retained as parameters.

Section 2

Tuning Indicator

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Visual tuning-indicator section.

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

Characteristics

Cutoff characteristic
Remote cutoff

SECTION 2

Tuning Indicator

Application

Application
Visual tuning indication

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heating
Heater current
200 mA
Heating
Maximum plate voltage
300 V
Promoted published datasheet value
Maximum screen voltage
300 V
Promoted published datasheet value
Maximum plate dissipation
0.4 W
Promoted published datasheet value
Maximum screen dissipation
0.2 W
Promoted published datasheet value
Va, = max
550 V
Limiting values
Va = max
300 V
Limiting values
Vg2° = max
550 V
Limiting values
Vg2 = max
300 V
Limiting values
Vg2 = max
0.2 W
Limiting values
Vlo = max
550 V
Limiting values

Characteristic

Plate resistance
700000 Ω
Promoted published datasheet value
Chauffage: indirect par C.h. ou C.C.; V€ = 6,
3 v
Published datasheet value
alimentation en paralldle If = 0,20
0 mA
Published datasheet value
Vb=Vt =
250 v
Published datasheet value
Va = 120
172 v
Published datasheet value
Vg2 = 30
166 v
Published datasheet value
Vel = -1,5
-20 v
Published datasheet value
Ia = 1,0
0.58 mA
Published datasheet value
Ig2 = 0,63
0.26 mA
Published datasheet value
I2 = 0,65
1 mA
Published datasheet value

Capacitance

Ca =
6.6 pF
Capacitances
Capacités Cgl =
6.4 pF
Capacitances