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
9D2
Brimar variable-mu RF pentode for controlled high-frequency amplification. Its gradual cutoff characteristic supports automatic gain regulation in receiver RF or IF signal stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 13 V / 200 mA
Description
Vari-mu RF pentode.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 13 V
- Nominal heater current
- 200 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
- Plate resistance
- 600000 Ω
- Transconductance
- 0.00165 S
- Max plate voltage
- 250 V
- Max screen voltage
- 125 V
Vari-mu RF pentode.
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.
Data set 02
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Anode Voltage
250 V
Anode Current
10.5 mA
Screen Voltage
125 V
Screen Current
2.6 mA
Control Grid Voltage
-3 V
Control Grid Voltage at Low Transconductance
-52 V