Voltage Radio Detector Converter ·Octode
Octode frequency changer for superheterodyne receivers, combining oscillator and mixer action in one multi-grid valve. High output resistance and controllable conversion gain suit automatic gain regulation.
Telefunken octode frequency changer, intended for the same receiver-mixer applications as AK1.
European 8-pin side-contact base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Octode mixer/oscillator; canonical TubeType and SectionType lists have no Octode value, so Other is used.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Plate voltage
250 V
Screen voltage
90 V
Screen current
2 mA
Conversion transconductance
600 µS
Grid-anode capacitance
0.061 pF
Data set 02
Published operating points and test conditions from this source.
Typical oscillator-modulator plate current
1.6 mA
Oscillator effective grid voltage
8.5 V
Maximum no-current anode voltage
550 V
Maximum heater-cathode voltage
50 V
Typical conversion transconductance
0.0006 A/V
Data set 03
Published operating points and test conditions from this source.
Heater voltage
4 V
Heater current
650 mA
Plate voltage
250 V
Screen/auxiliary voltage
90 V
Plate current
1.6 mA
Screen/auxiliary current
3.8 mA
Transconductance
600 uS
Conversion
Plate resistance
1600000 ohm
Control-grid to plate capacitance maximum
0.06 pF