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 — 6SF5 has grid on pin 3, 6F5 has grid on top cap. Not a drop-in replacement without rewiring.
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)300V
Typical Operating
Anode Voltage (typical)Plate Voltage (typical)250V
Grid 1 Bias VoltageGrid Voltage-2V
Anode CurrentPlate Current0.9mA
Notes
The grid connection was moved from the Octal base to a top cap on 18 June 1935, creating the 6F5 as distinct from the earlier base-grid version and from the successor 6SF5.
Metal-shell envelope (MTT8A). Pin 1 (shell) is internally connected to the cathode — connect to cathode or circuit ground.
Maximum ratings and typical operating conditions are identical to the 6SF5. The RCA resistance-coupled amplifier chart published under Type 6SF5 applies to the 6F5 and 6F5-GT.
In circuits where the cathode is not directly connected to the heater, the heater-to-cathode voltage should be kept as low as possible (no discrete Vhk_max stated in the consulted datasheet).
The 6F5G is a glass-bulb (globe) variant and 6F5GT is the glass-GT variant — both electrically identical with the grid on a top cap. CV715, CV1908, CV1909, CV1910 are British military equivalents.
Pa_max not stated in the RCA 1947 or Raytheon 1945 datasheets consulted. At the typical operating point (Va=250V, Ia=0.9mA), anode dissipation is approximately 225mW.