Power - Pentode (NOT beam) (over 1000V 100W) ·Pentode
5C-450A
Standard Valves 5C/450A directly heated thoriated-tungsten RF transmitting pentode for high-power Class C amplification and suppressor-grid modulation, rated 3000 V anode and 450 W dissipation.
- Sections
- 1
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater
- 10 V / 12.5 A
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- -
- Nominal heater voltage
- 10 V
- Nominal heater current
- 12.5 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
Pentode
- Transconductance
- 0.0045 S
- Max plate voltage
- 3000 V
- Max screen voltage
- 850 V
- Max plate dissipation
- 450 W
- Max screen dissipation
- 100 W
Standard Valves 5C/450A RF suppressor-modulated pentode, July 1947 ratings. Max anode 3000 V DC, 0.7 A, 450 W dissipation; screen max 850 V, 100 W dissipation; full ratings to 10 MHz, max anode 2250 V at 20 MHz. Transconductance 0.0045 A/V under manufacturer stated conditions; Cga 0.2 pF, input 45 pF, output 27 pF. Earlier 1940 data gm 0.0065 A/V, input 26 pF, output 39 pF and screen max 650 V; preserve source-specific values. Typical Class C suppressor modulated: Va 2500 V, Ia 300 mA, Vg2 530 V, Vg3 -90 V, Vg1 -165 V, output ~300 W carrier. Unmodulated Class C: Va 2500 V, Ia 590 mA, Vg2 600 V, Ig2 80 mA, Vg3 +100 V, Vg1 -165 V, output ~1 kW. Thoriated tungsten directly heated 10 V 12.5 A filament; free air cooling essential.
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.