Power - Triode ·Triode
3C28
Airtron 3C28 directly heated thoriated-tungsten high-frequency transmitting power triode, 6.3 V 3 A filament, 25 W plate dissipation and up to 100 MHz full-power Class C RF service.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- 4
- Nominal heater
- 6.3 V / 3 A
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 4
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 3 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
Triode
- Amplification factor
- 25
- Max plate voltage
- 2000 V
- Max plate dissipation
- 25 W
Airtron 3C28 directly heated high-frequency transmitting triode. Class C unmodulated RF maximum DC plate voltage 2000 V, plate current 75 mA, grid current 25 mA, plate dissipation 25 W. Class C plate-modulated maximum DC plate 1500 V, plate current 60 mA, grid current 25 mA, plate dissipation 17 W. Promoted 2000 V/25 W values are for unmodulated Class C; do not apply to other modes. Amplification factor 25. Full-power frequency limit 100 MHz, half-power 350 MHz for 3C28. Typical output: unmodulated RF up to 90 W, plate-modulated 60 W, grid-modulated 15 W, doubler 51 W, tripler 22 W, balanced two-tube Class B audio 120 W. Thoriated tungsten filament 6.3 V 3 A. Capacitances listed in manufacturer datasheet but per-tube OCR ambiguous; no exact values promoted.
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.