Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Heptode
Application
Service
Frequency changer
Voltage Radio Detector Converter ·Heptode
15D2
Heptode oscillator-converter for superheterodyne radio receivers, combining local oscillation and frequency conversion within one valve. Its series-heater design suits compact AC/DC receiving equipment requiring an integrated frequency-changing stage.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 13 V / 150 mA
Description
Heptode frequency changer for superheterodyne receiver service.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 13 V
- Nominal heater current
- 150 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- Yes
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
Heptode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 360000 Ω
- Max plate voltage
- 250 V
- Max screen voltage
- 100 V
Brimar 15D2 octal heptode receiving frequency changer, 13 V 150 mA series-string heater. Typical anode 250 V at 3.5 mA, grids 3 and 5 screen 100 V at 2.7 mA, oscillator anode grid 2 supply 200 V at 4 mA, control grid 4 -3 V, oscillator grid 1 resistor 50 kΩ. Typical plate resistance approximately 360 kΩ, conversion conductance ~0.55 mA/V. The latter is conversion gain, not intrinsic static gm. Brimar references 6A8G for characteristics; operating voltages are not established absolute maxima.
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.