Data set 01
1959 Telefunken
Published operating points and test conditions from this source.
SECTION 1
Tetrode
Application
Application
Superheterodyne mixer / frequency changer
Other
Recommended control-grid bias
-1.5 V
Voltage Radio Detector Converter ·Tetrode
REN704D
Early indirectly heated double-grid mixer tube for superheterodyne frequency-changing service, combining incoming RF and local-oscillator signals.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 4 V / 1 A
Description
Early indirectly heated double-grid mixer tube for superheterodyne frequency-changing service.
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
- 4 V
- Nominal heater current
- 1 A
- 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
Tetrode
X-ray radiationInterelectrode capacitances
- Max plate voltage
- 200 V
Published historical Telefunken data promoted where legible; surrounding handbook text used only for the filename-designated tube.
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.