Power - Triode ·Triode
3C34
Heintz & Kaufman 3C34 directly heated thoriated-tungsten transmitting power triode for RF amplification, oscillation and Class B audio modulation, with 6.3 V 3 A filament and 25 W plate dissipation.
- 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
- Transconductance
- 0.0026 S
- Amplification factor
- 25
- Max plate voltage
- 2000 V
- Max plate dissipation
- 25 W
RMA 1945 3C34 directly heated thoriated-tungsten transmitting triode. At Va 1000 V, Ia 35 mA: mu 25 and gm 0.0026 A/V. Grid-plate capacitance 1.3 pF, grid-filament 2.1 pF, plate-filament 0.2 pF. Class C unmodulated max Va 2000 V, Ia 75 mA, plate dissipation 25 W; typical output 90 W. Class C plate-modulated max Va 1500 V, Ia 80 mA, plate dissipation 17 W; typical output 60 W. Class B audio balanced pair typical 1250 V, output 120 W; maximum 1500 V. Promoted 2000 V and 25 W correspond to Class C unmodulated limits, not plate-modulated. Full ratings to 60 MHz; higher frequencies require reduced plate voltage and power input.
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.