Data set 01
1959 Telefunken
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Triode-connected operation
Published
TriodeConnection
Voltage Pentode ·Pentode
EF804
Telefunken low-hum, low-microphony audio pentode designed for sensitive microphone and preamplifier voltage-amplifier stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 200 mA
Description
Low-hum low-microphony AF pentode.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- 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
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.002 S
- Max plate voltage
- 300 V
- Max screen voltage
- 200 V
- Max plate dissipation
- 1.5 W
- Max screen dissipation
- 0.2 W
Published Telefunken values promoted where applicable; additional values retained as parameters.
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.