Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Variable-mu characteristic
Remote cutoff
Voltage Pentode - Remote Cutoff (single) ·Pentode
1F3
Directly heated variable-mu RF pentode designed for battery operation. Its gain-control characteristic makes it suitable for RF amplifier stages in portable receivers where automatic or manual gain variation is required.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 1.4 V / 50 mA
Description
Variable-mu R.F. pentode, directly heated for battery operation.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 50 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
- 500000 Ω
- Transconductance
- 0.00087 S
- Max plate voltage
- 90 V
- Max screen voltage
- 67.5 V
- Max cathode current
- 5.5 mA
Mazda 1F3 directly heated 1.4 V, 50 mA variable-mu (remote-cutoff) RF pentode for battery-operated receivers with B7G seven-pin base. Maximum anode voltage 90 V, screen voltage 67.5 V, and maximum MEAN cathode current 5.5 mA. Mazda typical operating points (plate V/screen V: plate current, screen current, gm, approximate rp): 45/45 V: 1.6/0.7 mA, 0.65 mA/V, 350 kΩ; 67.5/67.5 V: 3.3/1.6 mA, 0.95 mA/V, 260 kΩ; 90/45 V: 1.7/0.66 mA, 0.70 mA/V, 800 kΩ; 90/67.5 V: 3.4/1.4 mA, 0.87 mA/V, 500 kΩ. Promoted transconductance and plate resistance use the 90 V anode / 67.5 V screen typical point, not maximum ratings. Manufacturer publishes interelectrode capacitances.
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.