TUBEOFILE
6C6 — Small Signal Pentode, UX6 | Tubeofile
Known Equivalents & Substitutes
6J7 6J7G 6J7GT 57 77 1221 CV585 Similar Tubes (Not Drop-In Compatible)
Brans lists as equivalent but different base — not pin-compatible Same envelope and base, remote-cutoff version — not interchangeable in RF/IF circuits requiring sharp cutoff Similar electricals but Loctal base — not pin-compatible Electrical Specifications
Absolute Maximum
Anode Voltage (max) Anode Voltage (max, pentode) 300V
Screen Voltage (max) Screen Voltage (max) 125V
Anode Dissipation (max) Anode Dissipation (max, pentode) 0.75W
Screen Dissipation (max) Screen Dissipation (max) 0.1W
Notes
The 6C6 is electrically identical to the 6J7G/GT except for interelectrode capacitances. Uses the older 6-pin base (6F/UX6) whereas the 6J7 uses octal. Can be used in triode connection (suppressor grid and screen tied to plate). In triode mode: Va max 250V, Pa max 1.75W, mu=20, gm=1800 umhos, Rp=11kΩ. Top-cap connection for control grid (pin TC). Pin Layout — UX6
1 2 3 4 5
1 Grid 2 (Screen)
2 Anode
3 Heater
4 Heater
5
Anode Voltage (typical) Anode Voltage (typical) 250V
Grid 1 Bias Voltage Grid 1 Bias Voltage -3V
Anode Current Anode Current 2mA
Screen Voltage Screen Voltage (typical) 100V
Screen Current Screen Current 0.5mA
Anode Resistance Anode Resistance 1,000,000Ω
Transconductance Transconductance 1.225mA/V
Capacitances
Grid-to-Plate Capacitance Grid-to-Plate Capacitance (pentode, max) 0.007pF
Grid-to-Cathode Capacitance Grid-to-Cathode Capacitance (pentode) 5pF
Anode-to-Cathode Capacitance Plate-to-Cathode Capacitance (pentode) 6.5pF
Heater
Heater Voltage Heater Voltage 6.3V
Heater Current Heater Current 0.3A
Cathode , Grid 3 (Suppressor)
TC Top Cap — Grid 1 (Control Grid)