Voltage Radio Detector Converter ·Hexode-Triode
Brimar 20A1 triode-hexode radio frequency converter with shared cathode and separate oscillator section.
Triode-hexode frequency changer.
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 20A1 triode oscillator, typical anode voltage 100 V, current 2.3 mA, grid resistor 50 kΩ, oscillator grid current 0.25 mA. Common cathode with hexode. Typical values are not maximum ratings; no intrinsic gm, mu or rp stated.
Section 2
Brimar 1948 20A1 hexode mixer, typical anode voltage 250 V, anode current 2.2 mA, screen g2+g4 voltage 80 V, screen current 3.0 mA, control-grid bias -1.5 V, anode impedance 0.7 MΩ and conversion conductance 0.00065 A/V. Conversion conductance not conventional transconductance. 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
4 V
HeaterOrFilamentCurrent
1.2 A
Conversion Conductance
650 uS