Data: MediumMedium quality — at least 60% of universal parameters and pins are present, but some key data is missing. Verify specific values against datasheets before critical use.
Electrically identical (same mu=100, ra=66kΩ, gm=1.5mA/V) but different pinout — 6F5 has grid on top cap, 6SF5 has grid on pin 3. Not a drop-in replacement without rewiring.
6SF7
High-mu pentode variant in the same 6S-series family, similar heater and base but pentode structure
6SL7GT
High-mu dual triode with similar mu (~70) and high ra, but dual-section in a different basing arrangement
6SQ7 contains a triode section with similar high-mu characteristics, but also includes two diode sections (duplex-diode triode)
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Anode Voltage (max)300V
Max Grid ResistorMax Grid Resistor10MΩ
Typical Operating
Anode Voltage (typical)Anode Voltage (typical)250V
Grid 1 Bias VoltageGrid Voltage-2V
Notes
Coated unipotential cathode. In circuits where the cathode is not directly connected to the heater, the heater-to-cathode voltage should be kept as low as possible.