The 6K4P radio tube is a miniature high-frequency pentode used in RF/IF amplification stages (for example, in radio receivers).

📌 Main characteristics of the 6K4P

(typical for standard modes)

Heat:

• Filament voltage: 6.3 V
• Heating current: ≈300 mA

Electrical parameters:

• Anode voltage (nominal): 250 V
• Maximum anode voltage: 300 V
• 2nd grid voltage: 100 V (up to 125 V)
• Anode current: ≈10–11 mA
• Second grid current: ≈3.7 mA

Key parameters:

• Slope (S): ≈4.4 mA/V
• Internal resistance: ≥0.45 MOhm
• Input impedance (60 MHz): ≈19 kOhm

Power:

• Anode power dissipation: up to 3 W
• Dissipated power of the 2nd grid: up to 0.6 W

Capacities:

• Input: ≈6.4 pF
• Output: ≈6.7 pF
• Pass-through: ≤0.0045 pF

Other:

• Maximum cathode current: 20 mA
• Cathode-filament voltage: up to 90 V
• Base: 7-pin (miniature)