Voltage Radio Detector Converter ·Hexode-Triode
Brimar 20D2 triode-hexode radio frequency converter with shared cathode and separate oscillator section.
Triode-hexode frequency changer with characteristics referenced to the 6K8G family.
Small-button Noval 9-contact
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.
2 physical sections, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Brimar 1948/1958 20D2 triode oscillator, typical anode 100 V, current 3.8 mA, oscillator grid resistor 50 kΩ, grid current 0.15 mA. Common cathode with hexode. No maximum voltage, dissipation or conventional triode gm specified.
Section 2
Brimar 1948/1958 20D2 hexode mixer, typical anode 250 V, anode current 2.5 mA, g2/g4 screen 100 V and current 6.0 mA, control-grid -3 V, cathode-bias resistor 300 Ω, anode impedance 0.6 MΩ, conversion conductance 0.00036 A/V. Do not promote conversion conductance to ordinary gm. No maximum ratings specified.
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.
HeaterOrFilamentVoltage
13 V
HeaterOrFilamentCurrent
150 mA
Conversion Conductance
360 uS
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
13 V
Heater Current
150 mA
Referenced Characteristics
Type 6K8G
Source states characteristics as type 6K8G; values not invented