Voltage Radio Detector Converter ·Heptode
Brimar heptode frequency changer for superheterodyne radio receivers. Its multi-grid structure combines local-oscillator and mixer functions, reducing the receiver front end to a single valve for frequency conversion.
The BRIMAR 6A7E is a heptode frequency changer with a 6.3 V, 0.3 A heater and published interelectrode capacitances.
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
No fixed ratings are recorded for this section.
Brimar 6A7E indirectly heated 6.3 V 0.3 A heptode/pentagrid frequency changer for superheterodyne receiver local-oscillator and mixer service. Manufacturer lists RF input capacitance 8.5 pF, IF output 9.0 pF, oscillator input 7.0 pF and oscillator output 5.5 pF with close-fitting shield connected to cathode; grid-to-grid and grid-to-anode coupling capacitances separately tabulated. The manual recommends reference to 6A8 family for further operating information, but those related family values are not established as 6A7E maximum ratings and are not promoted. Conversion transconductance is different from static intrinsic gm. Existing capacitances-present flag true; single physical Heptode section.
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.
RF Input Capacitance
8.5 pF
IF Output Capacitance
9 pF
Oscillator Input Capacitance
7 pF
Oscillator Output Capacitance
5.5 pF
Control Grid to Oscillator Grid Capacitance
0.15 pF
Control Grid to Anode Capacitance
0.3 pF
Control Grid to Oscillator Anode Capacitance
0.15 pF
Oscillator Grid to Oscillator Anode Capacitance
1 pF
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
300 mA
Application
Heptode frequency changer