Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Cutoff characteristic
Variable-mu
Voltage Pentode - Remote Cutoff (single) ·Pentode
9A1
Brimar variable-mu RF pentode designed for controlled radio-frequency amplification. Its extended-control characteristic permits automatic gain regulation in receiver signal stages as incoming signal strength changes.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- M7A
- Base pins
- 7
- Nominal heater
- 4 V / 1 A
Description
Vari-mu RF pentode.
Socket description
British/European 7-pin
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- M7A
- Base pins
- 7
- Nominal heater voltage
- 4 V
- Nominal heater current
- 1 A
- 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
- Transconductance
- 0.00425 S
- Max plate voltage
- 200 V
- Max screen voltage
- 80 V
Published source values promoted where applicable; additional published values retained as parameters.
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.