Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
Wide-band / television RF-IF-VF amplifier
Voltage Pentode ·Pentode
8D3
High-slope Brimar RF pentode designed for wide-band television RF, IF, and video-frequency amplifier service. Its defining role is broadband television signal amplification across multiple receiver stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
High-slope RF pentode for wide-band, television RF/IF/VF amplifier service.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- 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
- Plate resistance
- 1000000 Ω
- Transconductance
- 0.0073 S
- Max plate voltage
- 275 V
- Max screen voltage
- 275 V
- Max plate dissipation
- 2.5 W
- Max screen dissipation
- 0.8 W
Published ratings and characteristics promoted semantically from source; repeated identical physical sections compressed where applicable.
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
Other
Plate Voltage
250 V
Plate Current
10 mA
Screen Voltage
250 V
Screen Current
2.6 mA
Characteristic
Plate Resistance
1 Mohm
Transconductance
7300 µS
Amplification Factor
70
Frequency Changer Maximum
100 MHz