Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
300 mA
PrintedDesignation
39/44
Voltage Pentode - Remote Cutoff (single) ·Pentode
3944
Variable-mu RF pentode published as type 39/44. Its extended-control characteristic supports automatic-volume-control RF amplification in receiving equipment, combining high-frequency gain with gradual cutoff under increasing grid bias.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 6.3 V / 300 mA
Description
Variable-mu RF pentode, printed as type 39/44.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
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
Pentode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Published ratings and characteristics promoted from the supplied Brimar source where explicitly available.
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.