Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
2 V
HeaterOrFilamentCurrent
260 mA
Other
Power Output
0.6 W
PushPull
Voltage Dual Pentode ·Pentode-Pentode
2103
Battery double pentode designed specifically for push-pull audio-output power service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- UX7
- Base pins
- 7
- Nominal heater
- 2 V / 260 mA
Description
Battery double pentode intended for push-pull output service.
Socket description
Small 7-contact (0.75-inch pin circle)
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- UX7
- Base pins
- 7
- Nominal heater voltage
- 2 V
- Nominal heater current
- 260 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
2 physical sections, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0016 S
Brimar 2103 directly heated battery double-pentode for push-pull audio power output, 2 V 0.26 A filament shared by both physical sections. Manufacturer gives 135 V anode, 135 V screen, -7.5 V control-grid bias, anode current 4.0 mA, screen current 1.2 mA and gm 1.6 mA/V for the specified service. Two-section push-pull amplifier output 0.6 W into optimum 24 kΩ anode-to-anode load. These published voltages are operating conditions, not explicitly absolute maximum ratings. Second pentode separately represented.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0016 S
Second physically separate pentode in Brimar 2103 battery push-pull double-pentode output valve. Direct 2 V 260 mA total filament. Brimar published nominal amplifier characteristics of 135 V plate and screen, -7.5 V grid, 4 mA anode, 1.2 mA screen and 1.6 mA/V mutual conductance; 0.6 W total push-pull output with 24 kΩ plate-to-plate load. These are operating characteristics rather than specified maximum limits. Two physical pentode rows retained.
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.